Merge pull request #1395 from crupest/dev

Refector 2023 v0.1

99 files changed, 0 insertions, 8022 deletions

diff --git a/FrontEnd/src/views/about/author-avatar.png b/FrontEnd/src/views/about/author-avatar.png
deleted file mode 100644
index d890d8d0..00000000
--- a/FrontEnd/src/views/about/author-avatar.png
+++ /dev/null
diff --git a/FrontEnd/src/views/about/github.png b/FrontEnd/src/views/about/github.png
deleted file mode 100644
index ea6ff545..00000000
--- a/FrontEnd/src/views/about/github.png
+++ /dev/null
diff --git a/FrontEnd/src/views/about/index.css b/FrontEnd/src/views/about/index.css
deleted file mode 100644
index 2574f4b7..00000000
--- a/FrontEnd/src/views/about/index.css
+++ /dev/null
@@ -1,4 +0,0 @@
-.about-link-icon {

-  width: 1.2em;

-  height: 1.2em;

-}

diff --git a/FrontEnd/src/views/about/index.tsx b/FrontEnd/src/views/about/index.tsx
deleted file mode 100644
index 093da894..00000000
--- a/FrontEnd/src/views/about/index.tsx
+++ /dev/null
@@ -1,143 +0,0 @@
-import { useTranslation, Trans } from "react-i18next";
-
-import authorAvatarUrl from "./author-avatar.png";
-import githubLogoUrl from "./github.png";
-
-import Card from "../common/Card";
-
-import "./index.css";
-
-const frontendCredits: {
-  name: string;
-  url: string;
-}[] = [
-  {
-    name: "reactjs",
-    url: "https://reactjs.org",
-  },
-  {
-    name: "typescript",
-    url: "https://www.typescriptlang.org",
-  },
-  {
-    name: "bootstrap",
-    url: "https://getbootstrap.com",
-  },
-  {
-    name: "vite",
-    url: "https://vitejs.dev",
-  },
-  {
-    name: "eslint",
-    url: "https://eslint.org",
-  },
-  {
-    name: "prettier",
-    url: "https://prettier.io",
-  },
-  {
-    name: "pepjs",
-    url: "https://github.com/jquery/PEP",
-  },
-];
-
-const backendCredits: {
-  name: string;
-  url: string;
-}[] = [
-  {
-    name: "ASP.NET Core",
-    url: "https://dotnet.microsoft.com/learn/aspnet/what-is-aspnet-core",
-  },
-  { name: "sqlite", url: "https://sqlite.org" },
-  {
-    name: "ImageSharp",
-    url: "https://github.com/SixLabors/ImageSharp",
-  },
-];
-
-export default function AboutPage() {
-  const { t } = useTranslation();
-
-  return (
-    <div className="px-2 mb-4">
-      <Card className="container mt-4 py-3">
-        <h4 id="author-info">{t("about.author.title")}</h4>
-        <div>
-          <div className="d-block">
-            <img
-              src={authorAvatarUrl}
-              className="cru-avatar large cru-round cru-float-left"
-            />
-            <p>
-              <small>{t("about.author.name")}</small>
-              <span className="cru-color-primary">crupest</span>
-            </p>
-            <p>
-              <small>{t("about.author.introduction")}</small>
-              {t("about.author.introductionContent")}
-            </p>
-          </div>
-          <p>
-            <small>{t("about.author.links")}</small>
-            <a
-              href="https://github.com/crupest"
-              target="_blank"
-              rel="noopener noreferrer"
-            >
-              <img src={githubLogoUrl} className="about-link-icon" />
-            </a>
-          </p>
-        </div>
-      </Card>
-      <Card className="container mt-4 py-3">
-        <h4>{t("about.site.title")}</h4>
-        <p>
-          <Trans i18nKey="about.site.content">
-            0<span className="cru-color-primary">1</span>2<b>3</b>4
-            <a href="#author-info">5</a>6
-          </Trans>
-        </p>
-        <p>
-          <a
-            href="https://github.com/crupest/Timeline"
-            target="_blank"
-            rel="noopener noreferrer"
-          >
-            {t("about.site.repo")}
-          </a>
-        </p>
-      </Card>
-      <Card className="container mt-4 py-3">
-        <h4>{t("about.credits.title")}</h4>
-        <p>{t("about.credits.content")}</p>
-        <p>{t("about.credits.frontend")}</p>
-        <ul>
-          {frontendCredits.map((item, index) => {
-            return (
-              <li key={index}>
-                <a href={item.url} target="_blank" rel="noopener noreferrer">
-                  {item.name}
-                </a>
-              </li>
-            );
-          })}
-          <li>...</li>
-        </ul>
-        <p>{t("about.credits.backend")}</p>
-        <ul>
-          {backendCredits.map((item, index) => {
-            return (
-              <li key={index}>
-                <a href={item.url} target="_blank" rel="noopener noreferrer">
-                  {item.name}
-                </a>
-              </li>
-            );
-          })}
-          <li>...</li>
-        </ul>
-      </Card>
-    </div>
-  );
-}
diff --git a/FrontEnd/src/views/admin/Admin.tsx b/FrontEnd/src/views/admin/Admin.tsx
deleted file mode 100644
index 986c36b4..00000000
--- a/FrontEnd/src/views/admin/Admin.tsx
+++ /dev/null
@@ -1,27 +0,0 @@
-import { Route, Routes } from "react-router-dom";
-import { useTranslation } from "react-i18next";
-
-import AdminNav from "./AdminNav";
-import UserAdmin from "./UserAdmin";
-import MoreAdmin from "./MoreAdmin";
-
-import "./index.css";
-
-const Admin: React.FC = () => {
-  useTranslation("admin");
-
-  return (
-    <>
-      <div className="container">
-        <AdminNav className="mt-2" />
-        <Routes>
-          <Route index element={<UserAdmin />} />
-          <Route path="user" element={<UserAdmin />} />
-          <Route path="more" element={<MoreAdmin />} />
-        </Routes>
-      </div>
-    </>
-  );
-};
-
-export default Admin;
diff --git a/FrontEnd/src/views/admin/AdminNav.tsx b/FrontEnd/src/views/admin/AdminNav.tsx
deleted file mode 100644
index b7385e5c..00000000
--- a/FrontEnd/src/views/admin/AdminNav.tsx
+++ /dev/null
@@ -1,29 +0,0 @@
-import { useLocation } from "react-router-dom";
-
-import Tabs from "../common/tab/Tabs";
-
-export function AdminNav({ className }: { className?: string }) {
-  const location = useLocation();
-  const name = location.pathname.split("/")[2] ?? "user";
-
-  return (
-    <Tabs
-      className={className}
-      activeTabName={name}
-      tabs={[
-        {
-          name: "user",
-          text: "admin:nav.users",
-          link: "/admin/user",
-        },
-        {
-          name: "more",
-          text: "admin:nav.more",
-          link: "/admin/more",
-        },
-      ]}
-    />
-  );
-}
-
-export default AdminNav;
diff --git a/FrontEnd/src/views/admin/MoreAdmin.tsx b/FrontEnd/src/views/admin/MoreAdmin.tsx
deleted file mode 100644
index d49d211f..00000000
--- a/FrontEnd/src/views/admin/MoreAdmin.tsx
+++ /dev/null
@@ -1,7 +0,0 @@
-import * as React from "react";
-
-const MoreAdmin: React.FC = () => {
-  return <>More...</>;
-};
-
-export default MoreAdmin;
diff --git a/FrontEnd/src/views/admin/UserAdmin.tsx b/FrontEnd/src/views/admin/UserAdmin.tsx
deleted file mode 100644
index d5179bf5..00000000
--- a/FrontEnd/src/views/admin/UserAdmin.tsx
+++ /dev/null
@@ -1,304 +0,0 @@
-import { useState, useEffect } from "react";
-import * as React from "react";
-import { Trans, useTranslation } from "react-i18next";
-import classnames from "classnames";
-
-import { getHttpUserClient, HttpUser, kUserPermissionList } from "@/http/user";
-
-import OperationDialog, {
-  OperationDialogBoolInput,
-} from "../common/dialog/OperationDialog";
-import Button from "../common/button/Button";
-import Spinner from "../common/Spinner";
-import FlatButton from "../common/button/FlatButton";
-import IconButton from "../common/button/IconButton";
-
-const CreateUserDialog: React.FC<{
-  open: boolean;
-  close: () => void;
-  onSuccess: (user: HttpUser) => void;
-}> = ({ open, close, onSuccess }) => {
-  return (
-    <OperationDialog
-      title="admin:user.dialog.create.title"
-      themeColor="success"
-      inputPrompt="admin:user.dialog.create.prompt"
-      inputScheme={
-        [
-          { type: "text", label: "admin:user.username" },
-          { type: "text", label: "admin:user.password" },
-        ] as const
-      }
-      onProcess={([username, password]) =>
-        getHttpUserClient().post({
-          username,
-          password,
-        })
-      }
-      onClose={close}
-      open={open}
-      onSuccessAndClose={onSuccess}
-    />
-  );
-};
-
-const UsernameLabel: React.FC<{ children: React.ReactNode }> = (props) => {
-  return <span style={{ color: "blue" }}>{props.children}</span>;
-};
-
-const UserDeleteDialog: React.FC<{
-  open: boolean;
-  close: () => void;
-  user: HttpUser;
-  onSuccess: () => void;
-}> = ({ open, close, user, onSuccess }) => {
-  return (
-    <OperationDialog
-      open={open}
-      onClose={close}
-      title="admin:user.dialog.delete.title"
-      themeColor="danger"
-      inputPrompt={() => (
-        <Trans i18nKey="user.dialog.delete.prompt" ns="admin">
-          0<UsernameLabel>{user.username}</UsernameLabel>2
-        </Trans>
-      )}
-      onProcess={() => getHttpUserClient().delete(user.username)}
-      onSuccessAndClose={onSuccess}
-    />
-  );
-};
-
-const UserModifyDialog: React.FC<{
-  open: boolean;
-  close: () => void;
-  user: HttpUser;
-  onSuccess: () => void;
-}> = ({ open, close, user, onSuccess }) => {
-  return (
-    <OperationDialog
-      open={open}
-      onClose={close}
-      title="admin:user.dialog.modify.title"
-      themeColor="danger"
-      inputPrompt={() => (
-        <Trans i18nKey="admin:user.dialog.modify.prompt">
-          0<UsernameLabel>{user.username}</UsernameLabel>2
-        </Trans>
-      )}
-      inputScheme={
-        [
-          {
-            type: "text",
-            label: "admin:user.username",
-            initValue: user.username,
-          },
-          { type: "text", label: "admin:user.password" },
-          {
-            type: "text",
-            label: "admin:user.nickname",
-            initValue: user.nickname,
-          },
-        ] as const
-      }
-      onProcess={([username, password, nickname]) =>
-        getHttpUserClient().patch(user.username, {
-          username: username !== user.username ? username : undefined,
-          password: password !== "" ? password : undefined,
-          nickname: nickname !== user.nickname ? nickname : undefined,
-        })
-      }
-      onSuccessAndClose={onSuccess}
-    />
-  );
-};
-
-const UserPermissionModifyDialog: React.FC<{
-  open: boolean;
-  close: () => void;
-  user: HttpUser;
-  onSuccess: () => void;
-}> = ({ open, close, user, onSuccess }) => {
-  const oldPermissionBoolList: boolean[] = kUserPermissionList.map(
-    (permission) => user.permissions.includes(permission)
-  );
-
-  return (
-    <OperationDialog
-      open={open}
-      onClose={close}
-      title="admin:user.dialog.modifyPermissions.title"
-      themeColor="danger"
-      inputPrompt={() => (
-        <Trans i18nKey="admin:user.dialog.modifyPermissions.prompt">
-          0<UsernameLabel>{user.username}</UsernameLabel>2
-        </Trans>
-      )}
-      inputScheme={kUserPermissionList.map<OperationDialogBoolInput>(
-        (permission, index) => ({
-          type: "bool",
-          label: { type: "custom", value: permission },
-          initValue: oldPermissionBoolList[index],
-        })
-      )}
-      onProcess={async (newPermissionBoolList): Promise<boolean[]> => {
-        for (let index = 0; index < kUserPermissionList.length; index++) {
-          const oldValue = oldPermissionBoolList[index];
-          const newValue = newPermissionBoolList[index];
-          const permission = kUserPermissionList[index];
-          if (oldValue === newValue) continue;
-          if (newValue) {
-            await getHttpUserClient().putUserPermission(
-              user.username,
-              permission
-            );
-          } else {
-            await getHttpUserClient().deleteUserPermission(
-              user.username,
-              permission
-            );
-          }
-        }
-        return newPermissionBoolList;
-      }}
-      onSuccessAndClose={onSuccess}
-    />
-  );
-};
-
-interface UserItemProps {
-  user: HttpUser;
-  onChange: () => void;
-}
-
-const UserItem: React.FC<UserItemProps> = ({ user, onChange }) => {
-  const { t } = useTranslation();
-
-  const [dialog, setDialog] = useState<
-    "delete" | "modify" | "permission" | null
-  >(null);
-
-  const [editMaskVisible, setEditMaskVisible] = React.useState<boolean>(false);
-
-  return (
-    <>
-      <div className="admin-user-item">
-        <IconButton
-          icon="pencil-square"
-          className="cru-float-right"
-          onClick={() => setEditMaskVisible(true)}
-        />
-        <h5 className="cru-color-primary">{user.username}</h5>
-        <small className="d-block cru-color-secondary">
-          {t("admin:user.nickname")}
-          {user.nickname}
-        </small>
-        <small className="d-block cru-color-secondary">
-          {t("admin:user.uniqueId")}
-          {user.uniqueId}
-        </small>
-        <small className="d-block cru-color-secondary">
-          {t("admin:user.permissions")}
-          {user.permissions.map((permission) => {
-            return (
-              <span key={permission} className="cru-color-danger">
-                {permission}
-              </span>
-            );
-          })}
-        </small>
-        <div
-          className={classnames("edit-mask", !editMaskVisible && "d-none")}
-          onClick={() => setEditMaskVisible(false)}
-        >
-          <FlatButton
-            text="admin:user.modify"
-            onClick={() => setDialog("modify")}
-          />
-          <FlatButton
-            text="admin:user.modifyPermissions"
-            onClick={() => setDialog("permission")}
-          />
-          <FlatButton
-            text="admin:user.delete"
-            color="danger"
-            onClick={() => setDialog("delete")}
-          />
-        </div>
-      </div>
-      <UserDeleteDialog
-        open={dialog === "delete"}
-        close={() => setDialog(null)}
-        user={user}
-        onSuccess={onChange}
-      />
-      <UserModifyDialog
-        open={dialog === "modify"}
-        close={() => setDialog(null)}
-        user={user}
-        onSuccess={onChange}
-      />
-      <UserPermissionModifyDialog
-        open={dialog === "permission"}
-        close={() => setDialog(null)}
-        user={user}
-        onSuccess={onChange}
-      />
-    </>
-  );
-};
-
-const UserAdmin: React.FC = () => {
-  const [users, setUsers] = useState<HttpUser[] | null>(null);
-  const [dialog, setDialog] = useState<"create" | null>(null);
-  const [usersVersion, setUsersVersion] = useState<number>(0);
-  const updateUsers = (): void => {
-    setUsersVersion(usersVersion + 1);
-  };
-
-  useEffect(() => {
-    let subscribe = true;
-    void getHttpUserClient()
-      .list()
-      .then((us) => {
-        if (subscribe) {
-          setUsers(us.items);
-        }
-      });
-    return () => {
-      subscribe = false;
-    };
-  }, [usersVersion]);
-
-  if (users) {
-    const userComponents = users.map((user) => {
-      return (
-        <UserItem key={user.username} user={user} onChange={updateUsers} />
-      );
-    });
-
-    return (
-      <>
-        <div className="row justify-content-end my-2">
-          <div className="col col-auto">
-            <Button
-              text="admin:create"
-              color="success"
-              onClick={() => setDialog("create")}
-            />
-          </div>
-        </div>
-        {userComponents}
-        <CreateUserDialog
-          open={dialog === "create"}
-          close={() => setDialog(null)}
-          onSuccess={updateUsers}
-        />
-      </>
-    );
-  } else {
-    return <Spinner />;
-  }
-};
-
-export default UserAdmin;
diff --git a/FrontEnd/src/views/admin/index.css b/FrontEnd/src/views/admin/index.css
deleted file mode 100644
index 17e24586..00000000
--- a/FrontEnd/src/views/admin/index.css
+++ /dev/null
@@ -1,33 +0,0 @@
-.admin-user-item {

-  position: relative;

-  border: var(--cru-primary-color) solid;

-  border-width: 1px 1px 0;

-  padding: 1em;

-}

-

-.admin-user-item:last-of-type {

-  border-bottom-width: 1px;

-}

-

-.admin-user-item .edit-mask {

-  position: absolute;

-  top: 0;

-  left: 0;

-  bottom: 0;

-  right: 0;

-  background: rgba(255, 255, 255, 0.9);

-  position: absolute;

-  display: flex;

-  justify-content: space-around;

-  align-items: center;

-}

-

-@media (max-width: 576px) {

-  .admin-user-item .edit-mask {

-    flex-direction: column;

-  }

-}

-

-.admin-user-item .edit-mask button {

-  margin: 0.5em 2em;

-}

diff --git a/FrontEnd/src/views/admin/index.tsx b/FrontEnd/src/views/admin/index.tsx
deleted file mode 100644
index 0467711d..00000000
--- a/FrontEnd/src/views/admin/index.tsx
+++ /dev/null
@@ -1,7 +0,0 @@
-import { lazy } from "react";
-
-const Admin = lazy(
-  () => import(/* webpackChunkName: "admin" */ "./Admin")
-);
-
-export default Admin;
diff --git a/FrontEnd/src/views/center/CenterBoards.tsx b/FrontEnd/src/views/center/CenterBoards.tsx
deleted file mode 100644
index a8be2c29..00000000
--- a/FrontEnd/src/views/center/CenterBoards.tsx
+++ /dev/null
@@ -1,131 +0,0 @@
-import * as React from "react";
-import { useTranslation } from "react-i18next";
-
-import { highlightTimelineUsername } from "@/common";
-
-import { pushAlert } from "@/services/alert";
-import { useUserLoggedIn } from "@/services/user";
-
-import { getHttpTimelineClient } from "@/http/timeline";
-import { getHttpBookmarkClient } from "@/http/bookmark";
-
-import TimelineBoard from "./TimelineBoard";
-
-const CenterBoards: React.FC = () => {
-  const { t } = useTranslation();
-
-  const user = useUserLoggedIn();
-
-  return (
-    <>
-      <div className="row justify-content-center">
-        <div className="col col-12 col-md-6">
-          <div className="row">
-            <div className="col col-12 my-2">
-              <TimelineBoard
-                title={t("home.bookmarkTimeline")}
-                load={() =>
-                  getHttpBookmarkClient()
-                    .list(user.username)
-                    .then((p) => p.items)
-                }
-                editHandler={{
-                  onDelete: (owner, timeline) => {
-                    return getHttpBookmarkClient()
-                      .delete(user.username, owner, timeline)
-                      .catch((e) => {
-                        pushAlert({
-                          message: "home.message.deleteBookmarkFail",
-                          type: "danger",
-                        });
-                        throw e;
-                      });
-                  },
-                  onMove: (owner, timeline, index, offset) => {
-                    return getHttpBookmarkClient()
-                      .move(
-                        user.username,
-                        owner,
-                        timeline,
-                        index + offset + 1 // +1 because backend contract: index starts at 1
-                      )
-                      .catch((e) => {
-                        pushAlert({
-                          message: "home.message.moveBookmarkFail",
-                          type: "danger",
-                        });
-                        throw e;
-                      })
-                      .then();
-                  },
-                }}
-              />
-            </div>
-            <div className="col col-12 my-2">
-              <TimelineBoard
-                title={t("home.highlightTimeline")}
-                load={() =>
-                  getHttpBookmarkClient()
-                    .list(highlightTimelineUsername)
-                    .then((p) => p.items)
-                }
-                editHandler={
-                  user.username === highlightTimelineUsername
-                    ? {
-                        onDelete: (owner, timeline) => {
-                          return getHttpBookmarkClient()
-                            .delete(highlightTimelineUsername, owner, timeline)
-                            .catch((e) => {
-                              pushAlert({
-                                message: "home.message.deleteHighlightFail",
-                                type: "danger",
-                              });
-                              throw e;
-                            });
-                        },
-                        onMove: (owner, timeline, index, offset) => {
-                          return getHttpBookmarkClient()
-                            .move(
-                              highlightTimelineUsername,
-                              owner,
-                              timeline,
-                              index + offset + 1 // +1 because backend contract: index starts at 1
-                            )
-                            .catch((e) => {
-                              pushAlert({
-                                message: "home.message.moveBookmarkFail",
-                                type: "danger",
-                              });
-                              throw e;
-                            })
-                            .then();
-                        },
-                      }
-                    : undefined
-                }
-              />
-            </div>
-          </div>
-        </div>
-        <div className="col-12 col-md-6 my-2">
-          <TimelineBoard
-            title={t("home.relatedTimeline")}
-            load={() =>
-              getHttpTimelineClient()
-                .listTimeline({ relate: user.username })
-                .then((l) =>
-                  l.map((t, index) => ({
-                    timelineOwner: t.owner.username,
-                    timelineName: t.nameV2,
-                    position: index + 1,
-                  }))
-                )
-            }
-          />
-        </div>
-      </div>
-    </>
-  );
-};
-
-export default CenterBoards;
diff --git a/FrontEnd/src/views/center/TimelineBoard.tsx b/FrontEnd/src/views/center/TimelineBoard.tsx
deleted file mode 100644
index b3ccdf8c..00000000
--- a/FrontEnd/src/views/center/TimelineBoard.tsx
+++ /dev/null
@@ -1,390 +0,0 @@
-import * as React from "react";
-import classnames from "classnames";
-import { Link } from "react-router-dom";
-
-import { TimelineBookmark } from "@/http/bookmark";
-
-import TimelineLogo from "../common/TimelineLogo";
-import LoadFailReload from "../common/LoadFailReload";
-import FlatButton from "../common/button/FlatButton";
-import Card from "../common/Card";
-import Spinner from "../common/Spinner";
-import IconButton from "../common/button/IconButton";
-
-interface TimelineBoardItemProps {
-  timeline: TimelineBookmark;
-  // In height.
-  offset?: number;
-  // In px.
-  arbitraryOffset?: number;
-  // If not null, will disable navigation on click.
-  actions?: {
-    onDelete: () => void;
-    onMove: {
-      start: (e: React.PointerEvent) => void;
-      moving: (e: React.PointerEvent) => void;
-      end: (e: React.PointerEvent) => void;
-    };
-  };
-}
-
-const TimelineBoardItem: React.FC<TimelineBoardItemProps> = ({
-  timeline,
-  arbitraryOffset,
-  offset,
-  actions,
-}) => {
-  const content = (
-    <>
-      <TimelineLogo className="icon" />
-      <span className="title">
-        {timeline.timelineOwner}/{timeline.timelineName}
-      </span>
-      <span className="flex-grow-1"></span>
-      {actions != null ? (
-        <div className="right">
-          <IconButton
-            icon="trash"
-            color="danger"
-            className="px-2"
-            onClick={actions.onDelete}
-          />
-          <IconButton
-            icon="grip-vertical"
-            className="px-2 touch-action-none"
-            onPointerDown={(e) => {
-              e.currentTarget.setPointerCapture(e.pointerId);
-              actions.onMove.start(e);
-            }}
-            onPointerUp={(e) => {
-              actions.onMove.end(e);
-              try {
-                e.currentTarget.releasePointerCapture(e.pointerId);
-              } catch (_) {
-                void null;
-              }
-            }}
-            onPointerMove={actions.onMove.moving}
-          />
-        </div>
-      ) : null}
-    </>
-  );
-
-  const offsetStyle: React.CSSProperties = {
-    transform:
-      arbitraryOffset != null
-        ? `translate(0,${arbitraryOffset}px)`
-        : offset != null
-        ? `translate(0,${offset * 100}%)`
-        : undefined,
-    transition: offset != null ? "transform 0.5s" : undefined,
-    zIndex: arbitraryOffset != null ? 1 : undefined,
-  };
-
-  return actions == null ? (
-    <Link
-      to={`${timeline.timelineOwner}/${timeline.timelineName}`}
-      className="timeline-board-item"
-    >
-      {content}
-    </Link>
-  ) : (
-    <div style={offsetStyle} className="timeline-board-item">
-      {content}
-    </div>
-  );
-};
-
-interface TimelineBoardItemContainerProps {
-  timelines: TimelineBookmark[];
-  editHandler?: {
-    // offset may exceed index range plusing index.
-    onMove: (
-      owner: string,
-      timeline: string,
-      index: number,
-      offset: number
-    ) => void;
-    onDelete: (owner: string, timeline: string) => void;
-  };
-}
-
-const TimelineBoardItemContainer: React.FC<TimelineBoardItemContainerProps> = ({
-  timelines,
-  editHandler,
-}) => {
-  const [moveState, setMoveState] = React.useState<null | {
-    index: number;
-    offset: number;
-    startPointY: number;
-  }>(null);
-
-  return (
-    <>
-      {timelines.map((timeline, index) => {
-        const height = 48;
-
-        let offset: number | undefined = undefined;
-        let arbitraryOffset: number | undefined = undefined;
-        if (moveState != null) {
-          if (index === moveState.index) {
-            arbitraryOffset = moveState.offset;
-          } else {
-            if (moveState.offset >= 0) {
-              const offsetCount = Math.round(moveState.offset / height);
-              if (
-                index > moveState.index &&
-                index <= moveState.index + offsetCount
-              ) {
-                offset = -1;
-              } else {
-                offset = 0;
-              }
-            } else {
-              const offsetCount = Math.round(-moveState.offset / height);
-              if (
-                index < moveState.index &&
-                index >= moveState.index - offsetCount
-              ) {
-                offset = 1;
-              } else {
-                offset = 0;
-              }
-            }
-          }
-        }
-
-        return (
-          <TimelineBoardItem
-            key={timeline.timelineOwner + "/" + timeline.timelineName}
-            timeline={timeline}
-            offset={offset}
-            arbitraryOffset={arbitraryOffset}
-            actions={
-              editHandler != null
-                ? {
-                    onDelete: () => {
-                      editHandler.onDelete(
-                        timeline.timelineOwner,
-                        timeline.timelineName
-                      );
-                    },
-                    onMove: {
-                      start: (e) => {
-                        if (moveState != null) return;
-                        setMoveState({
-                          index,
-                          offset: 0,
-                          startPointY: e.clientY,
-                        });
-                      },
-                      moving: (e) => {
-                        if (moveState == null) return;
-                        setMoveState({
-                          index,
-                          offset: e.clientY - moveState.startPointY,
-                          startPointY: moveState.startPointY,
-                        });
-                      },
-                      end: () => {
-                        if (moveState != null) {
-                          const offsetCount = Math.round(
-                            moveState.offset / height
-                          );
-                          editHandler.onMove(
-                            timeline.timelineOwner,
-                            timeline.timelineName,
-                            moveState.index,
-                            offsetCount
-                          );
-                        }
-                        setMoveState(null);
-                      },
-                    },
-                  }
-                : undefined
-            }
-          />
-        );
-      })}
-    </>
-  );
-};
-
-interface TimelineBoardUIProps {
-  title?: string | null;
-  state: "offline" | "loading" | "loaded";
-  timelines: TimelineBookmark[];
-  onReload: () => void;
-  className?: string;
-  editHandler?: {
-    onMove: (
-      owner: string,
-      timeline: string,
-      index: number,
-      offset: number
-    ) => void;
-    onDelete: (owner: string, timeline: string) => void;
-  };
-}
-
-const TimelineBoardUI: React.FC<TimelineBoardUIProps> = (props) => {
-  const { title, state, timelines, className, editHandler } = props;
-
-  const editable = editHandler != null;
-
-  const [editing, setEditing] = React.useState<boolean>(false);
-
-  return (
-    <Card className={classnames("timeline-board", className)}>
-      <div className="timeline-board-header">
-        {title != null && <h3>{title}</h3>}
-        {editable &&
-          (editing ? (
-            <FlatButton
-              text="done"
-              onClick={() => {
-                setEditing(false);
-              }}
-            />
-          ) : (
-            <FlatButton
-              text="edit"
-              onClick={() => {
-                setEditing(true);
-              }}
-            />
-          ))}
-      </div>
-      {(() => {
-        if (state === "loading") {
-          return (
-            <div className="d-flex flex-grow-1 justify-content-center align-items-center">
-              <Spinner />
-            </div>
-          );
-        } else if (state === "offline") {
-          return (
-            <div className="d-flex flex-grow-1 justify-content-center align-items-center">
-              <LoadFailReload onReload={props.onReload} />
-            </div>
-          );
-        } else {
-          return (
-            <TimelineBoardItemContainer
-              timelines={timelines}
-              editHandler={
-                editHandler && editing
-                  ? {
-                      onDelete: editHandler.onDelete,
-                      onMove: (owner, timeline, index, offset) => {
-                        if (index + offset >= timelines.length) {
-                          offset = timelines.length - index - 1;
-                        } else if (index + offset < 0) {
-                          offset = -index;
-                        }
-                        editHandler.onMove(owner, timeline, index, offset);
-                      },
-                    }
-                  : undefined
-              }
-            />
-          );
-        }
-      })()}
-    </Card>
-  );
-};
-
-export interface TimelineBoardProps {
-  title?: string | null;
-  className?: string;
-  load: () => Promise<TimelineBookmark[]>;
-  editHandler?: {
-    onMove: (
-      owner: string,
-      timeline: string,
-      index: number,
-      offset: number
-    ) => Promise<void>;
-    onDelete: (owner: string, timeline: string) => Promise<void>;
-  };
-}
-
-const TimelineBoard: React.FC<TimelineBoardProps> = ({
-  className,
-  title,
-  load,
-  editHandler,
-}) => {
-  const [state, setState] = React.useState<"offline" | "loading" | "loaded">(
-    "loading"
-  );
-  const [timelines, setTimelines] = React.useState<TimelineBookmark[]>([]);
-
-  React.useEffect(() => {
-    let subscribe = true;
-    if (state === "loading") {
-      void load().then(
-        (timelines) => {
-          if (subscribe) {
-            setState("loaded");
-            setTimelines(timelines);
-          }
-        },
-        () => {
-          setState("offline");
-        }
-      );
-    }
-    return () => {
-      subscribe = false;
-    };
-  }, [load, state]);
-
-  return (
-    <TimelineBoardUI
-      title={title}
-      className={className}
-      state={state}
-      timelines={timelines}
-      onReload={() => {
-        setState("loaded");
-      }}
-      editHandler={
-        typeof timelines === "object" && editHandler != null
-          ? {
-              onMove: (owner, timeline, index, offset) => {
-                const newTimelines = timelines.slice();
-                const [t] = newTimelines.splice(index, 1);
-                newTimelines.splice(index + offset, 0, t);
-                setTimelines(newTimelines);
-                editHandler
-                  .onMove(owner, timeline, index, offset)
-                  .then(null, () => {
-                    setTimelines(timelines);
-                  });
-              },
-              onDelete: (owner, timeline) => {
-                const newTimelines = timelines.slice();
-                newTimelines.splice(
-                  timelines.findIndex(
-                    (t) =>
-                      t.timelineOwner === owner && t.timelineName === timeline
-                  ),
-                  1
-                );
-                setTimelines(newTimelines);
-                editHandler.onDelete(owner, timeline).then(null, () => {
-                  setTimelines(timelines);
-                });
-              },
-            }
-          : undefined
-      }
-    />
-  );
-};
-
-export default TimelineBoard;
diff --git a/FrontEnd/src/views/center/TimelineCreateDialog.tsx b/FrontEnd/src/views/center/TimelineCreateDialog.tsx
deleted file mode 100644
index 63742936..00000000
--- a/FrontEnd/src/views/center/TimelineCreateDialog.tsx
+++ /dev/null
@@ -1,57 +0,0 @@
-import * as React from "react";
-import { useNavigate } from "react-router-dom";
-
-import { validateTimelineName } from "@/services/timeline";
-import { getHttpTimelineClient, HttpTimelineInfo } from "@/http/timeline";
-
-import OperationDialog from "../common/dialog/OperationDialog";
-import { useUserLoggedIn } from "@/services/user";
-
-interface TimelineCreateDialogProps {
-  open: boolean;
-  close: () => void;
-}
-
-const TimelineCreateDialog: React.FC<TimelineCreateDialogProps> = (props) => {
-  const navigate = useNavigate();
-
-  const user = useUserLoggedIn();
-
-  return (
-    <OperationDialog
-      open={props.open}
-      onClose={props.close}
-      themeColor="success"
-      title="home.createDialog.title"
-      inputScheme={
-        [
-          {
-            type: "text",
-            label: "home.createDialog.name",
-            helperText: "home.createDialog.nameFormat",
-          },
-        ] as const
-      }
-      inputValidator={([name]) => {
-        if (name.length === 0) {
-          return { 0: "home.createDialog.noEmpty" };
-        } else if (name.length > 26) {
-          return { 0: "home.createDialog.tooLong" };
-        } else if (!validateTimelineName(name)) {
-          return { 0: "home.createDialog.badFormat" };
-        } else {
-          return null;
-        }
-      }}
-      onProcess={([name]): Promise<HttpTimelineInfo> =>
-        getHttpTimelineClient().postTimeline({ name })
-      }
-      onSuccessAndClose={(timeline: HttpTimelineInfo) => {
-        navigate(`${user.username}/${timeline.nameV2}`);
-      }}
-      failurePrompt={(e) => `${e as string}`}
-    />
-  );
-};
-
-export default TimelineCreateDialog;
diff --git a/FrontEnd/src/views/center/index.css b/FrontEnd/src/views/center/index.css
deleted file mode 100644
index a779ff90..00000000
--- a/FrontEnd/src/views/center/index.css
+++ /dev/null
@@ -1,43 +0,0 @@
-.timeline-board {

-  min-height: 200px;

-  height: 100%;

-  position: relative;

-  padding: 1em 0;

-  display: flex;

-  flex-direction: column;

-}

-

-.timeline-board-header {

-  display: flex;

-  align-items: center;

-  justify-content: space-between;

-  padding: 0 1em;

-}

-

-.timeline-board-item {

-  font-size: 1.1em;

-  height: 48px;

-  transition: background 0.3s;

-  display: flex;

-  align-items: center;

-  padding: 0 1em;

-}

-

-.timeline-board-item .icon {

-  height: 1.3em;

-  color: black;

-}

-

-.timeline-board-item:hover {

-  background: #dee2e6;

-}

-.timeline-board-item .right {

-  display: flex;

-  align-items: center;

-  flex-shrink: 0;

-}

-.timeline-board-item .title {

-  white-space: nowrap;

-  overflow: hidden;

-  text-overflow: ellipsis;

-}

diff --git a/FrontEnd/src/views/center/index.tsx b/FrontEnd/src/views/center/index.tsx
deleted file mode 100644
index 77af2c20..00000000
--- a/FrontEnd/src/views/center/index.tsx
+++ /dev/null
@@ -1,60 +0,0 @@
-import * as React from "react";
-import { useNavigate } from "react-router-dom";
-
-import { useUserLoggedIn } from "@/services/user";
-
-import SearchInput from "../common/SearchInput";
-import Button from "../common/button/Button";
-import CenterBoards from "./CenterBoards";
-import TimelineCreateDialog from "./TimelineCreateDialog";
-
-import "./index.css";
-
-const HomePage: React.FC = () => {
-  const navigate = useNavigate();
-
-  const user = useUserLoggedIn();
-
-  const [navText, setNavText] = React.useState<string>("");
-
-  const [dialog, setDialog] = React.useState<"create" | null>(null);
-
-  return (
-    <>
-      <div className="container">
-        <div className="row my-3 justify-content-center">
-          <div className="col col-12 col-md-8">
-            <SearchInput
-              className="justify-content-center"
-              value={navText}
-              onChange={setNavText}
-              onButtonClick={() => {
-                navigate(`search?q=${navText}`);
-              }}
-              additionalButton={
-                user != null && (
-                  <Button
-                    text="home.createButton"
-                    color="success"
-                    onClick={() => {
-                      setDialog("create");
-                    }}
-                  />
-                )
-              }
-            />
-          </div>
-        </div>
-        <CenterBoards />
-      </div>
-      <TimelineCreateDialog
-        open={dialog === "create"}
-        close={() => {
-          setDialog(null);
-        }}
-      />
-    </>
-  );
-};
-
-export default HomePage;
diff --git a/FrontEnd/src/views/common/AppBar.css b/FrontEnd/src/views/common/AppBar.css
deleted file mode 100644
index 3ec4fa36..00000000
--- a/FrontEnd/src/views/common/AppBar.css
+++ /dev/null
@@ -1,95 +0,0 @@
-.app-bar {

-  display: flex;

-  align-items: center;

-  height: 56px;

-  position: fixed;

-  z-index: 1030;

-  top: 0;

-  left: 0;

-  right: 0;

-  background-color: var(--cru-primary-color);

-  transition: background-color 1s;

-}

-

-.app-bar .cru-avatar {

-  background-color: white;

-}

-

-.app-bar a {

-  color: var(--cru-primary-t1-color);

-  text-decoration: none;

-  margin: 0 1em;

-  transition: color 1s;

-}

-.app-bar a:hover {

-  color: var(--cru-primary-t-color);

-}

-.app-bar a.active {

-  color: var(--cru-primary-t-color);

-}

-

-.app-bar-brand {

-  display: flex;

-  align-items: center;

-}

-

-.app-bar-brand-icon {

-  height: 2em;

-}

-

-.app-bar-main-area {

-  display: flex;

-  flex-grow: 1;

-}

-

-.app-bar-link-area {

-  display: flex;

-  align-items: center;

-  flex-shrink: 0;

-}

-

-.app-bar-user-area {

-  display: flex;

-  align-items: center;

-  flex-shrink: 0;

-  margin-left: auto;

-}

-

-.small-screen .app-bar-main-area {

-  position: absolute;

-  top: 56px;

-  left: 0;

-  right: 0;

-  transform-origin: top;

-  transition: transform 0.6s, background-color 1s;

-  background-color: var(--cru-primary-color);

-  flex-direction: column;

-}

-.small-screen .app-bar-main-area.app-bar-collapse {

-  transform: scale(1, 0);

-}

-.small-screen .app-bar-main-area a {

-  text-align: left;

-  padding: 0.5em 0.5em;

-}

-.small-screen .app-bar-link-area {

-  flex-direction: column;

-  align-items: stretch;

-}

-.small-screen .app-bar-user-area {

-  flex-direction: column;

-  align-items: stretch;

-  margin-left: unset;

-}

-.small-screen .app-bar-avatar {

-  align-self: flex-end;

-}

-

-.app-bar-toggler {

-  margin-left: auto;

-  font-size: 2em;

-  margin-right: 1em;

-  color: var(--cru-primary-t-color);

-  cursor: pointer;

-  user-select: none;

-}

diff --git a/FrontEnd/src/views/common/AppBar.tsx b/FrontEnd/src/views/common/AppBar.tsx
deleted file mode 100644
index 278c70fd..00000000
--- a/FrontEnd/src/views/common/AppBar.tsx
+++ /dev/null
@@ -1,81 +0,0 @@
-import * as React from "react";
-import classnames from "classnames";
-import { useTranslation } from "react-i18next";
-import { Link, NavLink } from "react-router-dom";
-import { useMediaQuery } from "react-responsive";
-
-import { useUser } from "@/services/user";
-
-import TimelineLogo from "./TimelineLogo";
-import UserAvatar from "./user/UserAvatar";
-
-import "./AppBar.css";
-
-const AppBar: React.FC = () => {
-  const { t } = useTranslation();
-
-  const user = useUser();
-  const hasAdministrationPermission = user && user.hasAdministrationPermission;
-
-  const isSmallScreen = useMediaQuery({ maxWidth: 576 });
-
-  const [expand, setExpand] = React.useState<boolean>(false);
-  const collapse = (): void => setExpand(false);
-  const toggleExpand = (): void => setExpand(!expand);
-
-  const createLink = (
-    link: string,
-    label: React.ReactNode,
-    className?: string
-  ): React.ReactNode => (
-    <NavLink
-      to={link}
-      onClick={collapse}
-      className={({ isActive }) => classnames(className, isActive && "active")}
-    >
-      {label}
-    </NavLink>
-  );
-
-  return (
-    <nav className={classnames("app-bar", isSmallScreen && "small-screen")}>
-      <Link to="/" className="app-bar-brand active">
-        <TimelineLogo className="app-bar-brand-icon" />
-        Timeline
-      </Link>
-
-      {isSmallScreen && (
-        <i className="bi-list app-bar-toggler" onClick={toggleExpand} />
-      )}
-
-      <div
-        className={classnames(
-          "app-bar-main-area",
-          !expand && "app-bar-collapse"
-        )}
-      >
-        <div className="app-bar-link-area">
-          {createLink("/settings", t("nav.settings"))}
-          {createLink("/about", t("nav.about"))}
-          {hasAdministrationPermission &&
-            createLink("/admin", t("nav.administration"))}
-        </div>
-
-        <div className="app-bar-user-area">
-          {user != null
-            ? createLink(
-                "/",
-                <UserAvatar
-                  username={user.username}
-                  className="cru-avatar small cru-round cursor-pointer ml-auto"
-                />,
-                "app-bar-avatar"
-              )
-            : createLink("/login", t("nav.login"))}
-        </div>
-      </div>
-    </nav>
-  );
-};
-
-export default AppBar;
diff --git a/FrontEnd/src/views/common/BlobImage.tsx b/FrontEnd/src/views/common/BlobImage.tsx
deleted file mode 100644
index 5e050ebe..00000000
--- a/FrontEnd/src/views/common/BlobImage.tsx
+++ /dev/null
@@ -1,27 +0,0 @@
-import * as React from "react";
-
-const BlobImage: React.FC<
-  Omit<React.ImgHTMLAttributes<HTMLImageElement>, "src"> & {
-    blob?: Blob | unknown;
-  }
-> = (props) => {
-  const { blob, ...otherProps } = props;
-
-  const [url, setUrl] = React.useState<string | undefined>(undefined);
-
-  React.useEffect(() => {
-    if (blob instanceof Blob) {
-      const url = URL.createObjectURL(blob);
-      setUrl(url);
-      return () => {
-        URL.revokeObjectURL(url);
-      };
-    } else {
-      setUrl(undefined);
-    }
-  }, [blob]);
-
-  return <img {...otherProps} src={url} />;
-};
-
-export default BlobImage;
diff --git a/FrontEnd/src/views/common/Card.css b/FrontEnd/src/views/common/Card.css
deleted file mode 100644
index 6de0dd8e..00000000
--- a/FrontEnd/src/views/common/Card.css
+++ /dev/null
@@ -1,15 +0,0 @@
-:root {

-  --cru-card-border-radius: 8px;

-}

-

-.cru-card {

-  border: 1px solid;

-  border-color: #e9ecef;

-  border-radius: var(--cru-card-border-radius);

-  background: #fefeff;

-  transition: all 0.3s;

-}

-

-.cru-card:hover {

-  border-color: var(--cru-primary-color);

-}

diff --git a/FrontEnd/src/views/common/Card.tsx b/FrontEnd/src/views/common/Card.tsx
deleted file mode 100644
index ebbce77e..00000000
--- a/FrontEnd/src/views/common/Card.tsx
+++ /dev/null
@@ -1,27 +0,0 @@
-import classNames from "classnames";
-import * as React from "react";
-
-import "./Card.css";
-
-function _Card(
-  {
-    className,
-    children,
-    ...otherProps
-  }: React.PropsWithChildren<React.HTMLAttributes<HTMLDivElement>>,
-  ref: React.ForwardedRef<HTMLDivElement>
-): React.ReactElement | null {
-  return (
-    <div
-      ref={ref}
-      className={classNames("cru-card", className)}
-      {...otherProps}
-    >
-      {children}
-    </div>
-  );
-}
-
-const Card = React.forwardRef(_Card);
-
-export default Card;
diff --git a/FrontEnd/src/views/common/ImageCropper.css b/FrontEnd/src/views/common/ImageCropper.css
deleted file mode 100644
index 2c4d0a8c..00000000
--- a/FrontEnd/src/views/common/ImageCropper.css
+++ /dev/null
@@ -1,38 +0,0 @@
-.image-cropper-container {

-  position: relative;

-  box-sizing: border-box;

-  user-select: none;

-}

-

-.image-cropper-container img {

-  position: absolute;

-  left: 0;

-  top: 0;

-  width: 100%;

-  height: 100%;

-}

-

-.image-cropper-mask-container {

-  position: absolute;

-  left: 0;

-  top: 0;

-  right: 0;

-  bottom: 0;

-  overflow: hidden;

-}

-

-.image-cropper-mask {

-  position: absolute;

-  box-shadow: 0 0 0 10000px rgba(255, 255, 255, 0.8);

-  touch-action: none;

-}

-

-.image-cropper-handler {

-  position: absolute;

-  width: 26px;

-  height: 26px;

-  border: black solid 2px;

-  border-radius: 50%;

-  background: white;

-  touch-action: none;

-}

diff --git a/FrontEnd/src/views/common/ImageCropper.tsx b/FrontEnd/src/views/common/ImageCropper.tsx
deleted file mode 100644
index 04e17415..00000000
--- a/FrontEnd/src/views/common/ImageCropper.tsx
+++ /dev/null
@@ -1,306 +0,0 @@
-import * as React from "react";
-import classnames from "classnames";
-
-import { UiLogicError } from "@/common";
-
-import "./ImageCropper.css";
-
-export interface Clip {
-  left: number;
-  top: number;
-  width: number;
-}
-
-interface NormailizedClip extends Clip {
-  height: number;
-}
-
-interface ImageInfo {
-  width: number;
-  height: number;
-  landscape: boolean;
-  ratio: number;
-  maxClipWidth: number;
-  maxClipHeight: number;
-}
-
-interface ImageCropperSavedState {
-  clip: NormailizedClip;
-  x: number;
-  y: number;
-  pointerId: number;
-}
-
-export interface ImageCropperProps {
-  clip: Clip | null;
-  imageUrl: string;
-  onChange: (clip: Clip) => void;
-  imageElementCallback?: (element: HTMLImageElement | null) => void;
-  className?: string;
-}
-
-const ImageCropper = (props: ImageCropperProps): React.ReactElement => {
-  const { clip, imageUrl, onChange, imageElementCallback, className } = props;
-
-  const [oldState, setOldState] = React.useState<ImageCropperSavedState | null>(
-    null
-  );
-  const [imageInfo, setImageInfo] = React.useState<ImageInfo | null>(null);
-
-  const normalizeClip = (c: Clip | null | undefined): NormailizedClip => {
-    if (c == null) {
-      return { left: 0, top: 0, width: 0, height: 0 };
-    }
-
-    return {
-      left: c.left || 0,
-      top: c.top || 0,
-      width: c.width || 0,
-      height: imageInfo != null ? (c.width || 0) / imageInfo.ratio : 0,
-    };
-  };
-
-  const c = normalizeClip(clip);
-
-  const imgElementRef = React.useRef<HTMLImageElement | null>(null);
-
-  const onImageRef = React.useCallback(
-    (e: HTMLImageElement | null) => {
-      imgElementRef.current = e;
-      if (imageElementCallback != null && e == null) {
-        imageElementCallback(null);
-      }
-    },
-    [imageElementCallback]
-  );
-
-  const onImageLoad = React.useCallback(
-    (e: React.SyntheticEvent<HTMLImageElement>) => {
-      const img = e.currentTarget;
-      const landscape = img.naturalWidth >= img.naturalHeight;
-
-      const info = {
-        width: img.naturalWidth,
-        height: img.naturalHeight,
-        landscape,
-        ratio: img.naturalHeight / img.naturalWidth,
-        maxClipWidth: landscape ? img.naturalHeight / img.naturalWidth : 1,
-        maxClipHeight: landscape ? 1 : img.naturalWidth / img.naturalHeight,
-      };
-      setImageInfo(info);
-      onChange({ left: 0, top: 0, width: info.maxClipWidth });
-      if (imageElementCallback != null) {
-        imageElementCallback(img);
-      }
-    },
-    [onChange, imageElementCallback]
-  );
-
-  const onPointerDown = React.useCallback(
-    (e: React.PointerEvent) => {
-      if (oldState != null) return;
-      e.currentTarget.setPointerCapture(e.pointerId);
-      setOldState({
-        x: e.clientX,
-        y: e.clientY,
-        clip: c,
-        pointerId: e.pointerId,
-      });
-    },
-    [oldState, c]
-  );
-
-  const onPointerUp = React.useCallback(
-    (e: React.PointerEvent) => {
-      if (oldState == null || oldState.pointerId !== e.pointerId) return;
-      e.currentTarget.releasePointerCapture(e.pointerId);
-      setOldState(null);
-    },
-    [oldState]
-  );
-
-  const onPointerMove = React.useCallback(
-    (e: React.PointerEvent) => {
-      if (oldState == null) return;
-
-      const oldClip = oldState.clip;
-
-      const movement = { x: e.clientX - oldState.x, y: e.clientY - oldState.y };
-
-      const { current: imgElement } = imgElementRef;
-
-      if (imgElement == null) throw new UiLogicError("Image element is null.");
-
-      const moveRatio = {
-        x: movement.x / imgElement.width,
-        y: movement.y / imgElement.height,
-      };
-
-      const newRatio = {
-        x: oldClip.left + moveRatio.x,
-        y: oldClip.top + moveRatio.y,
-      };
-      if (newRatio.x < 0) {
-        newRatio.x = 0;
-      } else if (newRatio.x > 1 - oldClip.width) {
-        newRatio.x = 1 - oldClip.width;
-      }
-      if (newRatio.y < 0) {
-        newRatio.y = 0;
-      } else if (newRatio.y > 1 - oldClip.height) {
-        newRatio.y = 1 - oldClip.height;
-      }
-
-      onChange({ left: newRatio.x, top: newRatio.y, width: oldClip.width });
-    },
-    [oldState, onChange]
-  );
-
-  const onHandlerPointerMove = React.useCallback(
-    (e: React.PointerEvent) => {
-      if (oldState == null) return;
-
-      const oldClip = oldState.clip;
-
-      const movement = { x: e.clientX - oldState.x, y: e.clientY - oldState.y };
-
-      const ratio = imageInfo == null ? 1 : imageInfo.ratio;
-
-      const { current: imgElement } = imgElementRef;
-
-      if (imgElement == null) throw new UiLogicError("Image element is null.");
-
-      const moveRatio = {
-        x: movement.x / imgElement.width,
-        y: movement.x / imgElement.width / ratio,
-      };
-
-      const newRatio = {
-        x: oldClip.width + moveRatio.x,
-        y: oldClip.height + moveRatio.y,
-      };
-
-      const maxRatio = {
-        x: Math.min(1 - oldClip.left, newRatio.x),
-        y: Math.min(1 - oldClip.top, newRatio.y),
-      };
-
-      const maxWidthRatio = Math.min(maxRatio.x, maxRatio.y * ratio);
-
-      let newWidth;
-      if (newRatio.x < 0) {
-        newWidth = 0;
-      } else if (newRatio.x > maxWidthRatio) {
-        newWidth = maxWidthRatio;
-      } else {
-        newWidth = newRatio.x;
-      }
-
-      onChange({ left: oldClip.left, top: oldClip.top, width: newWidth });
-    },
-    [imageInfo, oldState, onChange]
-  );
-
-  const toPercentage = (n: number): string => `${n}%`;
-
-  // fuck!!! I just can't find a better way to implement this in pure css
-  const containerStyle: React.CSSProperties = (() => {
-    if (imageInfo == null) {
-      return { width: "100%", paddingTop: "100%", height: 0 };
-    } else {
-      if (imageInfo.ratio > 1) {
-        return {
-          width: toPercentage(100 / imageInfo.ratio),
-          paddingTop: "100%",
-          height: 0,
-        };
-      } else {
-        return {
-          width: "100%",
-          paddingTop: toPercentage(100 * imageInfo.ratio),
-          height: 0,
-        };
-      }
-    }
-  })();
-
-  return (
-    <div
-      className={classnames("image-cropper-container", className)}
-      style={containerStyle}
-    >
-      <img ref={onImageRef} src={imageUrl} onLoad={onImageLoad} alt="to crop" />
-      <div className="image-cropper-mask-container">
-        <div
-          className="image-cropper-mask"
-          style={{
-            left: toPercentage(c.left * 100),
-            top: toPercentage(c.top * 100),
-            width: toPercentage(c.width * 100),
-            height: toPercentage(c.height * 100),
-          }}
-          onPointerMove={onPointerMove}
-          onPointerDown={onPointerDown}
-          onPointerUp={onPointerUp}
-        />
-      </div>
-      <div
-        className="image-cropper-handler"
-        style={{
-          left: `calc(${(c.left + c.width) * 100}% - 15px)`,
-          top: `calc(${(c.top + c.height) * 100}% - 15px)`,
-        }}
-        onPointerMove={onHandlerPointerMove}
-        onPointerDown={onPointerDown}
-        onPointerUp={onPointerUp}
-      />
-    </div>
-  );
-};
-
-export default ImageCropper;
-
-export function applyClipToImage(
-  image: HTMLImageElement,
-  clip: Clip,
-  mimeType: string
-): Promise<Blob> {
-  return new Promise((resolve, reject) => {
-    const naturalSize = {
-      width: image.naturalWidth,
-      height: image.naturalHeight,
-    };
-    const clipArea = {
-      x: naturalSize.width * clip.left,
-      y: naturalSize.height * clip.top,
-      length: naturalSize.width * clip.width,
-    };
-
-    const canvas = document.createElement("canvas");
-    canvas.width = clipArea.length;
-    canvas.height = clipArea.length;
-    const context = canvas.getContext("2d");
-
-    if (context == null) throw new Error("Failed to create context.");
-
-    context.drawImage(
-      image,
-      clipArea.x,
-      clipArea.y,
-      clipArea.length,
-      clipArea.length,
-      0,
-      0,
-      clipArea.length,
-      clipArea.length
-    );
-
-    canvas.toBlob((blob) => {
-      if (blob == null) {
-        reject(new Error("canvas.toBlob returns null"));
-      } else {
-        resolve(blob);
-      }
-    }, mimeType);
-  });
-}
diff --git a/FrontEnd/src/views/common/LoadFailReload.tsx b/FrontEnd/src/views/common/LoadFailReload.tsx
deleted file mode 100644
index 81ba1f67..00000000
--- a/FrontEnd/src/views/common/LoadFailReload.tsx
+++ /dev/null
@@ -1,37 +0,0 @@
-import * as React from "react";
-import { Trans } from "react-i18next";
-
-export interface LoadFailReloadProps {
-  className?: string;
-  style?: React.CSSProperties;
-  onReload: () => void;
-}
-
-const LoadFailReload: React.FC<LoadFailReloadProps> = ({
-  onReload,
-  className,
-  style,
-}) => {
-  return (
-    <Trans
-      i18nKey="loadFailReload"
-      parent="div"
-      className={className}
-      style={style}
-    >
-      0
-      <a
-        href="#"
-        onClick={(e) => {
-          onReload();
-          e.preventDefault();
-        }}
-      >
-        1
-      </a>
-      2
-    </Trans>
-  );
-};
-
-export default LoadFailReload;
diff --git a/FrontEnd/src/views/common/LoadingPage.tsx b/FrontEnd/src/views/common/LoadingPage.tsx
deleted file mode 100644
index 35ee1aa8..00000000
--- a/FrontEnd/src/views/common/LoadingPage.tsx
+++ /dev/null
@@ -1,13 +0,0 @@
-import * as React from "react";
-
-import Spinner from "./Spinner";
-
-const LoadingPage: React.FC = () => {
-  return (
-    <div className="position-fixed w-100 h-100 d-flex justify-content-center align-items-center">
-      <Spinner />
-    </div>
-  );
-};
-
-export default LoadingPage;
diff --git a/FrontEnd/src/views/common/SearchInput.css b/FrontEnd/src/views/common/SearchInput.css
deleted file mode 100644
index f0503016..00000000
--- a/FrontEnd/src/views/common/SearchInput.css
+++ /dev/null
@@ -1,8 +0,0 @@
-.cru-search-input {

-  display: flex;

-  flex-wrap: wrap;

-}

-

-.cru-search-input-input {

-  width: 100%;

-}

diff --git a/FrontEnd/src/views/common/SearchInput.tsx b/FrontEnd/src/views/common/SearchInput.tsx
deleted file mode 100644
index 9d644ab7..00000000
--- a/FrontEnd/src/views/common/SearchInput.tsx
+++ /dev/null
@@ -1,79 +0,0 @@
-import { useCallback } from "react";
-import * as React from "react";
-import classnames from "classnames";
-import { useTranslation } from "react-i18next";
-
-import LoadingButton from "./button/LoadingButton";
-
-import "./SearchInput.css";
-
-export interface SearchInputProps {
-  value: string;
-  onChange: (value: string) => void;
-  onButtonClick: () => void;
-  className?: string;
-  loading?: boolean;
-  buttonText?: string;
-  placeholder?: string;
-  additionalButton?: React.ReactNode;
-  alwaysOneline?: boolean;
-}
-
-const SearchInput: React.FC<SearchInputProps> = (props) => {
-  const { onChange, onButtonClick, alwaysOneline } = props;
-
-  const { t } = useTranslation();
-
-  const onInputChange = useCallback(
-    (event: React.ChangeEvent<HTMLInputElement>): void => {
-      onChange(event.currentTarget.value);
-    },
-    [onChange]
-  );
-
-  const onInputKeyPress = useCallback(
-    (event: React.KeyboardEvent<HTMLInputElement>): void => {
-      if (event.key === "Enter") {
-        onButtonClick();
-        event.preventDefault();
-      }
-    },
-    [onButtonClick]
-  );
-
-  return (
-    <div
-      className={classnames(
-        "cru-search-input",
-        alwaysOneline ? "flex-nowrap" : "flex-sm-nowrap",
-        props.className
-      )}
-    >
-      <input
-        type="text"
-        className="cru-search-input-input me-sm-2 flex-grow-1"
-        value={props.value}
-        onChange={onInputChange}
-        onKeyPress={onInputKeyPress}
-        placeholder={props.placeholder}
-      />
-      {props.additionalButton ? (
-        <div className="mt-2 mt-sm-0 flex-shrink-0 order-sm-last ms-sm-2">
-          {props.additionalButton}
-        </div>
-      ) : null}
-      <div
-        className={classnames(
-          alwaysOneline ? "mt-0 ms-2" : "mt-2 mt-sm-0 ms-auto ms-sm-0",
-          "flex-shrink-0"
-        )}
-      >
-        <LoadingButton loading={props.loading} onClick={props.onButtonClick}>
-          {props.buttonText ?? t("search")}
-        </LoadingButton>
-      </div>
-    </div>
-  );
-};
-
-export default SearchInput;
diff --git a/FrontEnd/src/views/common/Skeleton.css b/FrontEnd/src/views/common/Skeleton.css
deleted file mode 100644
index db1a1c34..00000000
--- a/FrontEnd/src/views/common/Skeleton.css
+++ /dev/null
@@ -1,14 +0,0 @@
-.cru-skeleton {

-  padding: 0 1em;

-}

-

-.cru-skeleton-line {

-  height: 1em;

-  background-color: #e6e6e6;

-  margin: 0.7em 0;

-  border-radius: 0.2em;

-}

-

-.cru-skeleton-line.last {

-  width: 50%;

-}

diff --git a/FrontEnd/src/views/common/Skeleton.tsx b/FrontEnd/src/views/common/Skeleton.tsx
deleted file mode 100644
index 3b149db9..00000000
--- a/FrontEnd/src/views/common/Skeleton.tsx
+++ /dev/null
@@ -1,32 +0,0 @@
-import * as React from "react";
-import classnames from "classnames";
-import range from "lodash/range";
-
-import "./Skeleton.css";
-
-export interface SkeletonProps {
-  lineNumber?: number;
-  className?: string;
-  style?: React.CSSProperties;
-}
-
-const Skeleton: React.FC<SkeletonProps> = (props) => {
-  const { lineNumber: lineNumberProps, className, style } = props;
-  const lineNumber = lineNumberProps ?? 3;
-
-  return (
-    <div className={classnames(className, "cru-skeleton")} style={style}>
-      {range(lineNumber).map((i) => (
-        <div
-          key={i}
-          className={classnames(
-            "cru-skeleton-line",
-            i === lineNumber - 1 && "last"
-          )}
-        />
-      ))}
-    </div>
-  );
-};
-
-export default Skeleton;
diff --git a/FrontEnd/src/views/common/Spinner.css b/FrontEnd/src/views/common/Spinner.css
deleted file mode 100644
index a1de68d2..00000000
--- a/FrontEnd/src/views/common/Spinner.css
+++ /dev/null
@@ -1,13 +0,0 @@
-@keyframes cru-spinner-animation {

-  from {

-    transform: scale(0,0);

-  }

-}

-

-.cru-spinner {

-  display: inline-block;

-  animation: cru-spinner-animation 0.5s infinite alternate;

-  background-color: currentColor;

-  border-radius: 50%;

-  transform-origin: center;

-}

diff --git a/FrontEnd/src/views/common/Spinner.tsx b/FrontEnd/src/views/common/Spinner.tsx
deleted file mode 100644
index e99a9d1b..00000000
--- a/FrontEnd/src/views/common/Spinner.tsx
+++ /dev/null
@@ -1,43 +0,0 @@
-import * as React from "react";
-import classnames from "classnames";
-
-import { PaletteColorType } from "@/palette";
-
-import "./Spinner.css";
-
-export interface SpinnerProps {
-  size?: "sm" | "md" | "lg" | number | string;
-  color?: PaletteColorType;
-  className?: string;
-  style?: React.CSSProperties;
-}
-
-export default function Spinner(
-  props: SpinnerProps
-): React.ReactElement | null {
-  const { size, color, className, style } = props;
-  const calculatedSize =
-    size === "sm"
-      ? "18px"
-      : size === "md"
-      ? "30px"
-      : size === "lg"
-      ? "42px"
-      : typeof size === "number"
-      ? size
-      : size == null
-      ? "20px"
-      : size;
-  const calculatedColor = color ?? "primary";
-
-  return (
-    <span
-      className={classnames(
-        "cru-spinner",
-        `cru-color-${calculatedColor}`,
-        className
-      )}
-      style={{ width: calculatedSize, height: calculatedSize, ...style }}
-    />
-  );
-}
diff --git a/FrontEnd/src/views/common/TimelineLogo.tsx b/FrontEnd/src/views/common/TimelineLogo.tsx
deleted file mode 100644
index e06ed0f5..00000000
--- a/FrontEnd/src/views/common/TimelineLogo.tsx
+++ /dev/null
@@ -1,27 +0,0 @@
-import { SVGAttributes } from "react";
-import * as React from "react";
-
-export interface TimelineLogoProps extends SVGAttributes<SVGElement> {
-  color?: string;
-}
-
-const TimelineLogo: React.FC<TimelineLogoProps> = (props) => {
-  const { color, ...forwardProps } = props;
-  const coercedColor = color ?? "currentcolor";
-  return (
-    <svg
-      className={props.className}
-      viewBox="0 0 100 100"
-      fill="none"
-      strokeWidth="12"
-      stroke={coercedColor}
-      {...forwardProps}
-    >
-      <line x1="50" y1="0" x2="50" y2="25" />
-      <circle cx="50" cy="50" r="22" />
-      <line x1="50" y1="75" x2="50" y2="100" />
-    </svg>
-  );
-};
-
-export default TimelineLogo;
diff --git a/FrontEnd/src/views/common/alert/AlertHost.tsx b/FrontEnd/src/views/common/alert/AlertHost.tsx
deleted file mode 100644
index 42074781..00000000
--- a/FrontEnd/src/views/common/alert/AlertHost.tsx
+++ /dev/null
@@ -1,113 +0,0 @@
-import * as React from "react";
-import without from "lodash/without";
-import { useTranslation } from "react-i18next";
-import classNames from "classnames";
-
-import { alertService, AlertInfoEx, AlertInfo } from "@/services/alert";
-import { convertI18nText } from "@/common";
-
-import IconButton from "../button/IconButton";
-
-import "./alert.css";
-
-interface AutoCloseAlertProps {
-  alert: AlertInfo;
-  close: () => void;
-}
-
-export const AutoCloseAlert: React.FC<AutoCloseAlertProps> = (props) => {
-  const { alert, close } = props;
-  const { dismissTime } = alert;
-
-  const { t } = useTranslation();
-
-  const timerTag = React.useRef<number | null>(null);
-  const closeHandler = React.useRef<(() => void) | null>(null);
-
-  React.useEffect(() => {
-    closeHandler.current = close;
-  }, [close]);
-
-  React.useEffect(() => {
-    const tag =
-      dismissTime === "never"
-        ? null
-        : typeof dismissTime === "number"
-        ? window.setTimeout(() => closeHandler.current?.(), dismissTime)
-        : window.setTimeout(() => closeHandler.current?.(), 5000);
-    timerTag.current = tag;
-    return () => {
-      if (tag != null) {
-        window.clearTimeout(tag);
-      }
-    };
-  }, [dismissTime]);
-
-  const cancelTimer = (): void => {
-    const { current: tag } = timerTag;
-    if (tag != null) {
-      window.clearTimeout(tag);
-    }
-  };
-
-  return (
-    <div
-      className={classNames(
-        "m-3 cru-alert",
-        "cru-" + (alert.type ?? "primary")
-      )}
-      onClick={cancelTimer}
-    >
-      <div className="cru-alert-content">
-        {(() => {
-          const { message, customMessage } = alert;
-          if (customMessage != null) {
-            return customMessage;
-          } else {
-            return convertI18nText(message, t);
-          }
-        })()}
-      </div>
-      <div className="cru-alert-close-button-container">
-        <IconButton
-          icon="x"
-          className="cru-alert-close-button"
-          onClick={close}
-        />
-      </div>
-    </div>
-  );
-};
-
-const AlertHost: React.FC = () => {
-  const [alerts, setAlerts] = React.useState<AlertInfoEx[]>([]);
-
-  React.useEffect(() => {
-    const consume = (alert: AlertInfoEx): void => {
-      setAlerts((old) => [...old, alert]);
-    };
-
-    alertService.registerConsumer(consume);
-    return () => {
-      alertService.unregisterConsumer(consume);
-    };
-  }, []);
-
-  return (
-    <div className="alert-container">
-      {alerts.map((alert) => {
-        return (
-          <AutoCloseAlert
-            key={alert.id}
-            alert={alert}
-            close={() => {
-              setAlerts((old) => without(old, alert));
-            }}
-          />
-        );
-      })}
-    </div>
-  );
-};
-
-export default AlertHost;
diff --git a/FrontEnd/src/views/common/alert/alert.css b/FrontEnd/src/views/common/alert/alert.css
deleted file mode 100644
index fc15e3cb..00000000
--- a/FrontEnd/src/views/common/alert/alert.css
+++ /dev/null
@@ -1,33 +0,0 @@
-.alert-container {

-  position: fixed;

-  z-index: 1040;

-}

-

-.cru-alert {

-  border-radius: 5px;

-  border: var(--cru-theme-color) 1px solid;

-  color: var(--cru-theme-t-color);

-  background-color: var(--cru-theme-r1-color);

-

-  display: flex;

-  overflow: hidden;

-}

-

-.cru-alert-content {

-  padding: 0.5em 2em;

-}

-

-.cru-alert-close-button-container {

-  flex-shrink: 0;

-  margin-left: auto;

-  width: 2em;

-  text-align: center;

-  display: flex;

-  align-items: center;

-  justify-content: center;

-  background-color: var(--cru-theme-t-color);

-}

-

-.cru-alert-close-button {

-  color: var(--cru-theme-color);

-}

diff --git a/FrontEnd/src/views/common/button/Button.css b/FrontEnd/src/views/common/button/Button.css
deleted file mode 100644
index c34176f6..00000000
--- a/FrontEnd/src/views/common/button/Button.css
+++ /dev/null
@@ -1,51 +0,0 @@
-.cru-button:not(.outline) {

-  color: var(--cru-theme-t-color);

-  cursor: pointer;

-  padding: 0.2em 0.5em;

-  border-radius: 0.2em;

-  border: none;

-  transition: all 0.5s;

-  background-color: var(--cru-theme-color);

-}

-

-.cru-button:not(.outline):hover {

-  background-color: var(--cru-theme-f1-color);

-}

-

-.cru-button:not(.outline):active {

-  background-color: var(--cru-theme-f2-color);

-}

-

-.cru-button:not(.outline):disabled {

-  background-color: var(--cru-disable-color);

-  cursor: auto;

-}

-

-.cru-button.outline {

-  color: var(--cru-theme-color);

-  border: var(--cru-theme-color) 1px solid;

-  cursor: pointer;

-  padding: 0.2em 0.5em;

-  border-radius: 0.2em;

-  transition: all 0.6s;

-  background-color: white;

-}

-

-.cru-button.outline:hover {

-  color: var(--cru-theme-f1-color);

-  border-color: var(--cru-theme-f1-color);

-  background-color: var(--cru-background-color);

-}

-

-.cru-button.outline:active {

-  color: var(--cru-theme-f2-color);

-  border-color: var(--cru-theme-f2-color);

-  background-color: var(--cru-background-1-color);

-}

-

-.cru-button.outline:disabled {

-  color: var(--cru-disable-color);

-  border-color: var(--cru-disable-color);

-  background-color: white;

-  cursor: auto;

-}

diff --git a/FrontEnd/src/views/common/button/Button.tsx b/FrontEnd/src/views/common/button/Button.tsx
deleted file mode 100644
index be605328..00000000
--- a/FrontEnd/src/views/common/button/Button.tsx
+++ /dev/null
@@ -1,47 +0,0 @@
-import { ComponentPropsWithoutRef, Ref } from "react";
-import classNames from "classnames";
-
-import { I18nText, useC } from "@/common";
-import { PaletteColorType } from "@/palette";
-
-import "./Button.css";
-
-interface ButtonProps extends ComponentPropsWithoutRef<"button"> {
-  color?: PaletteColorType;
-  text?: I18nText;
-  outline?: boolean;
-  buttonRef?: Ref<HTMLButtonElement> | null;
-}
-
-export default function Button(props: ButtonProps) {
-  const {
-    buttonRef,
-    color,
-    text,
-    outline,
-    className,
-    children,
-    ...otherProps
-  } = props;
-
-  if (text != null && children != null) {
-    console.warn("You can't set both text and children props.");
-  }
-
-  const c = useC();
-
-  return (
-    <button
-      ref={buttonRef}
-      className={classNames(
-        "cru-" + (color ?? "primary"),
-        "cru-button",
-        outline && "outline",
-        className,
-      )}
-      {...otherProps}
-    >
-      {text != null ? c(text) : children}
-    </button>
-  );
-}
diff --git a/FrontEnd/src/views/common/button/FlatButton.css b/FrontEnd/src/views/common/button/FlatButton.css
deleted file mode 100644
index f0d33153..00000000
--- a/FrontEnd/src/views/common/button/FlatButton.css
+++ /dev/null
@@ -1,18 +0,0 @@
-.cru-flat-button {

-  cursor: pointer;

-  padding: 0.2em 0.5em;

-  border-radius: 0.2em;

-  border: none;

-  background-color: transparent;

-  transition: all 0.6s;

-  color: var(--cru-theme-color);

-}

-

-.cru-flat-button.disabled {

-  color: var(--cru-theme-l1-color);

-  cursor: default;

-}

-

-.cru-flat-button:hover:not(.disabled) {

-  background-color: #e9ecef;

-}

diff --git a/FrontEnd/src/views/common/button/FlatButton.tsx b/FrontEnd/src/views/common/button/FlatButton.tsx
deleted file mode 100644
index 49912b68..00000000
--- a/FrontEnd/src/views/common/button/FlatButton.tsx
+++ /dev/null
@@ -1,37 +0,0 @@
-import { ComponentPropsWithoutRef, Ref } from "react";
-import classNames from "classnames";
-
-import { I18nText, useC } from "@/common";
-import { PaletteColorType } from "@/palette";
-
-import "./FlatButton.css";
-
-interface FlatButtonProps extends ComponentPropsWithoutRef<"button"> {
-  color?: PaletteColorType;
-  text?: I18nText;
-  buttonRef?: Ref<HTMLButtonElement> | null;
-}
-
-export default function FlatButton(props: FlatButtonProps) {
-  const { color, text, className, children, buttonRef, ...otherProps } = props;
-
-  if (text != null && children != null) {
-    console.warn("You can't set both text and children props.");
-  }
-
-  const c = useC();
-
-  return (
-    <button
-      ref={buttonRef}
-      className={classNames(
-        "cru-" + (color ?? "primary"),
-        "cru-flat-button",
-        className,
-      )}
-      {...otherProps}
-    >
-      {text != null ? c(text) : children}
-    </button>
-  );
-}
diff --git a/FrontEnd/src/views/common/button/IconButton.css b/FrontEnd/src/views/common/button/IconButton.css
deleted file mode 100644
index 45fb103c..00000000
--- a/FrontEnd/src/views/common/button/IconButton.css
+++ /dev/null
@@ -1,10 +0,0 @@
-.cru-icon-button {
-  color: var(--cru-theme-color);
-  font-size: 1.4rem;
-  background: none;
-  border: none;
-}
-
-.cru-icon-button.large {
-  font-size: 1.6rem;
-}
diff --git a/FrontEnd/src/views/common/button/IconButton.tsx b/FrontEnd/src/views/common/button/IconButton.tsx
deleted file mode 100644
index 652a8b09..00000000
--- a/FrontEnd/src/views/common/button/IconButton.tsx
+++ /dev/null
@@ -1,29 +0,0 @@
-import { ComponentPropsWithoutRef } from "react";
-import classNames from "classnames";
-
-import { PaletteColorType } from "@/palette";
-
-import "./IconButton.css";
-
-interface IconButtonProps extends ComponentPropsWithoutRef<"i"> {
-  icon: string;
-  color?: PaletteColorType;
-  large?: boolean;
-}
-
-export default function IconButton(props: IconButtonProps) {
-  const { icon, color, className, large, ...otherProps } = props;
-
-  return (
-    <button
-      className={classNames(
-        "cru-icon-button",
-        large && "large",
-        "bi-" + icon,
-        color ? "cru-" + color : "cru-primary",
-        className,
-      )}
-      {...otherProps}
-    />
-  );
-}
diff --git a/FrontEnd/src/views/common/button/LoadingButton.tsx b/FrontEnd/src/views/common/button/LoadingButton.tsx
deleted file mode 100644
index fceaec27..00000000
--- a/FrontEnd/src/views/common/button/LoadingButton.tsx
+++ /dev/null
@@ -1,40 +0,0 @@
-import * as React from "react";
-import classNames from "classnames";
-import { useTranslation } from "react-i18next";
-
-import { convertI18nText, I18nText } from "@/common";
-import { PaletteColorType } from "@/palette";
-
-import Spinner from "../Spinner";
-
-interface LoadingButtonProps extends React.ComponentPropsWithoutRef<"button"> {
-  color?: PaletteColorType;
-  text?: I18nText;
-  loading?: boolean;
-}
-
-function LoadingButton(props: LoadingButtonProps): JSX.Element {
-  const { t } = useTranslation();
-
-  const { color, text, loading, className, children, ...otherProps } = props;
-
-  if (text != null && children != null) {
-    console.warn("You can't set both text and children props.");
-  }
-
-  return (
-    <button
-      className={classNames(
-        "cru-" + (color ?? "primary"),
-        "cru-button outline",
-        className,
-      )}
-      {...otherProps}
-    >
-      {text != null ? convertI18nText(text, t) : children}
-      {loading && <Spinner />}
-    </button>
-  );
-}
-
-export default LoadingButton;
diff --git a/FrontEnd/src/views/common/button/index.tsx b/FrontEnd/src/views/common/button/index.tsx
deleted file mode 100644
index cff5ba3f..00000000
--- a/FrontEnd/src/views/common/button/index.tsx
+++ /dev/null
@@ -1,6 +0,0 @@
-import Button from "./Button";
-import FlatButton from "./FlatButton";
-import IconButton from "./IconButton";
-import LoadingButton from "./LoadingButton";
-
-export { Button, FlatButton, IconButton, LoadingButton };
diff --git a/FrontEnd/src/views/common/dialog/ConfirmDialog.tsx b/FrontEnd/src/views/common/dialog/ConfirmDialog.tsx
deleted file mode 100644
index 8c2cea5a..00000000
--- a/FrontEnd/src/views/common/dialog/ConfirmDialog.tsx
+++ /dev/null
@@ -1,43 +0,0 @@
-import { convertI18nText, I18nText } from "@/common";
-import * as React from "react";
-import { useTranslation } from "react-i18next";
-
-import Button from "../button/Button";
-import Dialog from "./Dialog";
-
-const ConfirmDialog: React.FC<{
-  open: boolean;
-  onClose: () => void;
-  onConfirm: () => void;
-  title: I18nText;
-  body: I18nText;
-}> = ({ open, onClose, onConfirm, title, body }) => {
-  const { t } = useTranslation();
-
-  return (
-    <Dialog onClose={onClose} open={open}>
-      <h3 className="cru-color-danger">{convertI18nText(title, t)}</h3>
-      <hr />
-      <p>{convertI18nText(body, t)}</p>
-      <hr />
-      <div className="cru-dialog-bottom-area">
-        <Button
-          text="operationDialog.cancel"
-          color="secondary"
-          outline
-          onClick={onClose}
-        />
-        <Button
-          text="operationDialog.confirm"
-          color="danger"
-          onClick={() => {
-            onConfirm();
-            onClose();
-          }}
-        />
-      </div>
-    </Dialog>
-  );
-};
-
-export default ConfirmDialog;
diff --git a/FrontEnd/src/views/common/dialog/Dialog.css b/FrontEnd/src/views/common/dialog/Dialog.css
deleted file mode 100644
index 21ea52fc..00000000
--- a/FrontEnd/src/views/common/dialog/Dialog.css
+++ /dev/null
@@ -1,55 +0,0 @@
-.cru-dialog-overlay {

-  position: fixed;

-  z-index: 1040;

-  left: 0;

-  top: 0;

-  right: 0;

-  bottom: 0;

-  background-color: rgba(255, 255, 255, 0.92);

-

-  display: flex;

-  padding: 2em;

-

-  overflow: auto;

-}

-

-.cru-dialog-container {

-  max-width: 100%;

-  min-width: 30vw;

-

-  margin: auto;

-

-  border: var(--cru-primary-color) 1px solid;

-  border-radius: 5px;

-  padding: 1.5em;

-  background-color: white;

-}

-

-.cru-dialog-bottom-area {

-  display: flex;

-  justify-content: flex-end;

-}

-

-.cru-dialog-bottom-area > * {

-  margin: 0 0.5em;

-}

-

-.cru-dialog-enter .cru-dialog-container {

-  transform: scale(0, 0);

-  opacity: 0;

-  transform-origin: center;

-}

-

-.cru-dialog-enter-active .cru-dialog-container {

-  transform: scale(1, 1);

-  opacity: 1;

-  transition: transform 0.3s, opacity 0.3s;

-  transform-origin: center;

-}

-

-.cru-dialog-exit-active .cru-dialog-container {

-  transition: transform 0.3s, opacity 0.3s;

-  transform: scale(0, 0);

-  opacity: 0;

-  transform-origin: center;

-}

diff --git a/FrontEnd/src/views/common/dialog/Dialog.tsx b/FrontEnd/src/views/common/dialog/Dialog.tsx
deleted file mode 100644
index 923c636b..00000000
--- a/FrontEnd/src/views/common/dialog/Dialog.tsx
+++ /dev/null
@@ -1,51 +0,0 @@
-import { ReactNode } from "react";
-import ReactDOM from "react-dom";
-import { CSSTransition } from "react-transition-group";
-
-import "./Dialog.css";
-
-const optionalPortalElement = document.getElementById("portal");
-if (optionalPortalElement == null) {
-  throw new Error("Portal element not found");
-}
-const portalElement = optionalPortalElement;
-
-interface DialogProps {
-  onClose: () => void;
-  open: boolean;
-  children?: ReactNode;
-  disableCloseOnClickOnOverlay?: boolean;
-}
-
-export default function Dialog(props: DialogProps) {
-  const { open, onClose, children, disableCloseOnClickOnOverlay } = props;
-
-  return ReactDOM.createPortal(
-    <CSSTransition
-      mountOnEnter
-      unmountOnExit
-      in={open}
-      timeout={300}
-      classNames="cru-dialog"
-    >
-      <div
-        className="cru-dialog-overlay"
-        onPointerDown={
-          disableCloseOnClickOnOverlay
-            ? undefined
-            : () => {
-                onClose();
-              }
-        }
-      >
-        <div
-          className="cru-dialog-container"
-          onPointerDown={(e) => e.stopPropagation()}
-        >
-          {children}
-        </div>
-      </div>
-    </CSSTransition>,
-    portalElement,
-  );
-}
diff --git a/FrontEnd/src/views/common/dialog/FullPageDialog.css b/FrontEnd/src/views/common/dialog/FullPageDialog.css
deleted file mode 100644
index 2f1fc636..00000000
--- a/FrontEnd/src/views/common/dialog/FullPageDialog.css
+++ /dev/null
@@ -1,44 +0,0 @@
-.cru-full-page {

-  position: fixed;

-  z-index: 1030;

-  left: 0;

-  top: 0;

-  right: 0;

-  bottom: 0;

-  background-color: white;

-  padding-top: 56px;

-}

-

-.cru-full-page-top-bar {

-  height: 56px;

-  position: absolute;

-  top: 0;

-  left: 0;

-  right: 0;

-  z-index: 1;

-  background-color: var(--cru-primary-color);

-  display: flex;

-  align-items: center;

-}

-

-.cru-full-page-content-container {

-  overflow: scroll;

-}

-

-.cru-full-page-back-button {

-  color: var(--cru-primary-t-color);

-}

-

-.cru-full-page-enter {

-  transform: translate(100%, 0);

-}

-

-.cru-full-page-enter-active {

-  transform: none;

-  transition: transform 0.3s;

-}

-

-.cru-full-page-exit-active {

-  transition: transform 0.3s;

-  transform: translate(100%, 0);

-}

diff --git a/FrontEnd/src/views/common/dialog/FullPageDialog.tsx b/FrontEnd/src/views/common/dialog/FullPageDialog.tsx
deleted file mode 100644
index 6368fc0a..00000000
--- a/FrontEnd/src/views/common/dialog/FullPageDialog.tsx
+++ /dev/null
@@ -1,53 +0,0 @@
-import * as React from "react";
-import { createPortal } from "react-dom";
-import classnames from "classnames";
-import { CSSTransition } from "react-transition-group";
-
-import "./FullPageDialog.css";
-import IconButton from "../button/IconButton";
-
-export interface FullPageDialogProps {
-  show: boolean;
-  onBack: () => void;
-  contentContainerClassName?: string;
-  children: React.ReactNode;
-}
-
-const FullPageDialog: React.FC<FullPageDialogProps> = ({
-  show,
-  onBack,
-  children,
-  contentContainerClassName,
-}) => {
-  return createPortal(
-    <CSSTransition
-      mountOnEnter
-      unmountOnExit
-      in={show}
-      timeout={300}
-      classNames="cru-full-page"
-    >
-      <div className="cru-full-page">
-        <div className="cru-full-page-top-bar">
-          <IconButton
-            icon="arrow-left"
-            className="ms-3 cru-full-page-back-button"
-            onClick={onBack}
-          />
-        </div>
-        <div
-          className={classnames(
-            "cru-full-page-content-container",
-            contentContainerClassName
-          )}
-        >
-          {children}
-        </div>
-      </div>
-    </CSSTransition>,
-    // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
-    document.getElementById("portal")!
-  );
-};
-
-export default FullPageDialog;
diff --git a/FrontEnd/src/views/common/dialog/OperationDialog.css b/FrontEnd/src/views/common/dialog/OperationDialog.css
deleted file mode 100644
index 2f7617d0..00000000
--- a/FrontEnd/src/views/common/dialog/OperationDialog.css
+++ /dev/null
@@ -1,25 +0,0 @@
-.cru-operation-dialog-group {

-  display: block;

-  margin: 0.4em 0;

-}

-

-.cru-operation-dialog-label {

-  display: block;

-  color: var(--cru-primary-color);

-}

-

-.cru-operation-dialog-inline-label {

-  margin-inline-start: 0.5em;

-}

-

-.cru-operation-dialog-error-text {

-  display: block;

-  font-size: 0.8em;

-  color: var(--cru-danger-color);

-}

-

-.cru-operation-dialog-helper-text {

-  display: block;

-  font-size: 0.8em;

-  color: var(--cru-primary-color);

-}

diff --git a/FrontEnd/src/views/common/dialog/OperationDialog.tsx b/FrontEnd/src/views/common/dialog/OperationDialog.tsx
deleted file mode 100644
index 71be030a..00000000
--- a/FrontEnd/src/views/common/dialog/OperationDialog.tsx
+++ /dev/null
@@ -1,531 +0,0 @@
-import { useState } from "react";
-import * as React from "react";
-import { useTranslation } from "react-i18next";
-import { TwitterPicker } from "react-color";
-import classNames from "classnames";
-import moment from "moment";
-
-import { convertI18nText, I18nText, UiLogicError } from "@/common";
-
-import { PaletteColorType } from "@/palette";
-
-import Button from "../button/Button";
-import LoadingButton from "../button/LoadingButton";
-import Dialog from "./Dialog";
-
-import "./OperationDialog.css";
-
-interface DefaultErrorPromptProps {
-  error?: string;
-}
-
-const DefaultErrorPrompt: React.FC<DefaultErrorPromptProps> = (props) => {
-  const { t } = useTranslation();
-
-  let result = <p className="cru-color-danger">{t("operationDialog.error")}</p>;
-
-  if (props.error != null) {
-    result = (
-      <>
-        {result}
-        <p className="cru-color-danger">{props.error}</p>
-      </>
-    );
-  }
-
-  return result;
-};
-
-export interface OperationDialogTextInput {
-  type: "text";
-  label?: I18nText;
-  password?: boolean;
-  initValue?: string;
-  textFieldProps?: Omit<
-    React.InputHTMLAttributes<HTMLInputElement>,
-    "type" | "value" | "onChange"
-  >;
-  helperText?: string;
-}
-
-export interface OperationDialogBoolInput {
-  type: "bool";
-  label: I18nText;
-  initValue?: boolean;
-  helperText?: string;
-}
-
-export interface OperationDialogSelectInputOption {
-  value: string;
-  label: I18nText;
-  icon?: React.ReactElement;
-}
-
-export interface OperationDialogSelectInput {
-  type: "select";
-  label: I18nText;
-  options: OperationDialogSelectInputOption[];
-  initValue?: string;
-}
-
-export interface OperationDialogColorInput {
-  type: "color";
-  label?: I18nText;
-  initValue?: string | null;
-  canBeNull?: boolean;
-}
-
-export interface OperationDialogDateTimeInput {
-  type: "datetime";
-  label?: I18nText;
-  initValue?: string;
-  helperText?: string;
-}
-
-export type OperationDialogInput =
-  | OperationDialogTextInput
-  | OperationDialogBoolInput
-  | OperationDialogSelectInput
-  | OperationDialogColorInput
-  | OperationDialogDateTimeInput;
-
-interface OperationInputTypeStringToValueTypeMap {
-  text: string;
-  bool: boolean;
-  select: string;
-  color: string | null;
-  datetime: string;
-}
-
-type MapOperationInputTypeStringToValueType<Type> =
-  Type extends keyof OperationInputTypeStringToValueTypeMap
-    ? OperationInputTypeStringToValueTypeMap[Type]
-    : never;
-
-type MapOperationInputInfoValueType<T> = T extends OperationDialogInput
-  ? MapOperationInputTypeStringToValueType<T["type"]>
-  : T;
-
-const initValueMapperMap: {
-  [T in OperationDialogInput as T["type"]]: (
-    item: T
-  ) => MapOperationInputInfoValueType<T>;
-} = {
-  bool: (item) => item.initValue ?? false,
-  color: (item) => item.initValue ?? null,
-  datetime: (item) => {
-    if (item.initValue != null) {
-      return moment(item.initValue).format("YYYY-MM-DDTHH:mm:ss");
-    } else {
-      return "";
-    }
-  },
-  select: (item) => item.initValue ?? item.options[0].value,
-  text: (item) => item.initValue ?? "",
-};
-
-type MapOperationInputInfoValueTypeList<
-  Tuple extends readonly OperationDialogInput[]
-> = {
-  [Index in keyof Tuple]: MapOperationInputInfoValueType<Tuple[Index]>;
-} & { length: Tuple["length"] };
-
-export type OperationInputError =
-  | {
-      [index: number]: I18nText | null | undefined;
-    }
-  | null
-  | undefined;
-
-const isNoError = (error: OperationInputError): boolean => {
-  if (error == null) return true;
-  for (const key in error) {
-    if (error[key] != null) return false;
-  }
-  return true;
-};
-
-export interface OperationDialogProps<
-  TData,
-  OperationInputInfoList extends readonly OperationDialogInput[]
-> {
-  open: boolean;
-  onClose: () => void;
-  title: I18nText | (() => React.ReactNode);
-  themeColor?: PaletteColorType;
-  onProcess: (
-    inputs: MapOperationInputInfoValueTypeList<OperationInputInfoList>
-  ) => Promise<TData>;
-  inputScheme?: OperationInputInfoList;
-  inputValidator?: (
-    inputs: MapOperationInputInfoValueTypeList<OperationInputInfoList>
-  ) => OperationInputError;
-  inputPrompt?: I18nText | (() => React.ReactNode);
-  processPrompt?: () => React.ReactNode;
-  successPrompt?: (data: TData) => React.ReactNode;
-  failurePrompt?: (error: unknown) => React.ReactNode;
-  onSuccessAndClose?: (data: TData) => void;
-}
-
-const OperationDialog = <
-  TData,
-  OperationInputInfoList extends readonly OperationDialogInput[]
->(
-  props: OperationDialogProps<TData, OperationInputInfoList>
-): React.ReactElement => {
-  const inputScheme = (props.inputScheme ??
-    []) as readonly OperationDialogInput[];
-
-  const { t } = useTranslation();
-
-  type Step =
-    | { type: "input" }
-    | { type: "process" }
-    | {
-        type: "success";
-        data: TData;
-      }
-    | {
-        type: "failure";
-        data: unknown;
-      };
-  const [step, setStep] = useState<Step>({ type: "input" });
-
-  type ValueType = boolean | string | null | undefined;
-
-  const [values, setValues] = useState<ValueType[]>(
-    inputScheme.map((item) => {
-      if (item.type in initValueMapperMap) {
-        return (
-          initValueMapperMap[item.type] as (
-            i: OperationDialogInput
-          ) => ValueType
-        )(item);
-      } else {
-        throw new UiLogicError("Unknown input scheme.");
-      }
-    })
-  );
-  const [dirtyList, setDirtyList] = useState<boolean[]>(() =>
-    inputScheme.map(() => false)
-  );
-  const [inputError, setInputError] = useState<OperationInputError>();
-
-  const close = (): void => {
-    if (step.type !== "process") {
-      props.onClose();
-      if (step.type === "success" && props.onSuccessAndClose) {
-        props.onSuccessAndClose(step.data);
-      }
-    } else {
-      console.log("Attempt to close modal when processing.");
-    }
-  };
-
-  const onConfirm = (): void => {
-    setStep({ type: "process" });
-    props
-      .onProcess(
-        values.map((v, index) => {
-          if (inputScheme[index].type === "datetime" && v !== "")
-            return new Date(v as string).toISOString();
-          else return v;
-        }) as unknown as MapOperationInputInfoValueTypeList<OperationInputInfoList>
-      )
-      .then(
-        (d) => {
-          setStep({
-            type: "success",
-            data: d,
-          });
-        },
-        (e: unknown) => {
-          setStep({
-            type: "failure",
-            data: e,
-          });
-        }
-      );
-  };
-
-  let body: React.ReactNode;
-  if (step.type === "input" || step.type === "process") {
-    const process = step.type === "process";
-
-    let inputPrompt =
-      typeof props.inputPrompt === "function"
-        ? props.inputPrompt()
-        : convertI18nText(props.inputPrompt, t);
-    inputPrompt = <h6>{inputPrompt}</h6>;
-
-    const validate = (values: ValueType[]): boolean => {
-      const { inputValidator } = props;
-      if (inputValidator != null) {
-        const result = inputValidator(
-          values as unknown as MapOperationInputInfoValueTypeList<OperationInputInfoList>
-        );
-        setInputError(result);
-        return isNoError(result);
-      }
-      return true;
-    };
-
-    const updateValue = (index: number, newValue: ValueType): void => {
-      const oldValues = values;
-      const newValues = oldValues.slice();
-      newValues[index] = newValue;
-      setValues(newValues);
-      if (dirtyList[index] === false) {
-        const newDirtyList = dirtyList.slice();
-        newDirtyList[index] = true;
-        setDirtyList(newDirtyList);
-      }
-      validate(newValues);
-    };
-
-    const canProcess = isNoError(inputError);
-
-    body = (
-      <>
-        <div>
-          {inputPrompt}
-          {inputScheme.map((item, index) => {
-            const value = values[index];
-            const error: string | null =
-              dirtyList[index] && inputError != null
-                ? convertI18nText(inputError[index], t)
-                : null;
-
-            if (item.type === "text") {
-              return (
-                <div
-                  key={index}
-                  className={classNames(
-                    "cru-operation-dialog-group",
-                    error != null ? "error" : null
-                  )}
-                >
-                  {item.label && (
-                    <label className="cru-operation-dialog-label">
-                      {convertI18nText(item.label, t)}
-                    </label>
-                  )}
-                  <input
-                    type={item.password === true ? "password" : "text"}
-                    value={value as string}
-                    onChange={(e) => {
-                      const v = e.target.value;
-                      updateValue(index, v);
-                    }}
-                    disabled={process}
-                  />
-                  {error != null && (
-                    <div className="cru-operation-dialog-error-text">
-                      {error}
-                    </div>
-                  )}
-                  {item.helperText && (
-                    <div className="cru-operation-dialog-helper-text">
-                      {t(item.helperText)}
-                    </div>
-                  )}
-                </div>
-              );
-            } else if (item.type === "bool") {
-              return (
-                <div
-                  key={index}
-                  className={classNames(
-                    "cru-operation-dialog-group",
-                    error != null ? "error" : null
-                  )}
-                >
-                  <input
-                    type="checkbox"
-                    checked={value as boolean}
-                    onChange={(event) => {
-                      updateValue(index, event.currentTarget.checked);
-                    }}
-                    disabled={process}
-                  />
-                  <label className="cru-operation-dialog-inline-label">
-                    {convertI18nText(item.label, t)}
-                  </label>
-                  {error != null && (
-                    <div className="cru-operation-dialog-error-text">
-                      {error}
-                    </div>
-                  )}
-                  {item.helperText && (
-                    <div className="cru-operation-dialog-helper-text">
-                      {t(item.helperText)}
-                    </div>
-                  )}
-                </div>
-              );
-            } else if (item.type === "select") {
-              return (
-                <div
-                  key={index}
-                  className={classNames(
-                    "cru-operation-dialog-group",
-                    error != null ? "error" : null
-                  )}
-                >
-                  <label className="cru-operation-dialog-label">
-                    {convertI18nText(item.label, t)}
-                  </label>
-                  <select
-                    value={value as string}
-                    onChange={(event) => {
-                      updateValue(index, event.target.value);
-                    }}
-                    disabled={process}
-                  >
-                    {item.options.map((option, i) => {
-                      return (
-                        <option value={option.value} key={i}>
-                          {option.icon}
-                          {convertI18nText(option.label, t)}
-                        </option>
-                      );
-                    })}
-                  </select>
-                </div>
-              );
-            } else if (item.type === "color") {
-              return (
-                <div
-                  key={index}
-                  className={classNames(
-                    "cru-operation-dialog-group",
-                    error != null ? "error" : null
-                  )}
-                >
-                  {item.canBeNull ? (
-                    <input
-                      type="checkbox"
-                      checked={value !== null}
-                      onChange={(event) => {
-                        if (event.currentTarget.checked) {
-                          updateValue(index, "#007bff");
-                        } else {
-                          updateValue(index, null);
-                        }
-                      }}
-                      disabled={process}
-                    />
-                  ) : null}
-                  <label className="cru-operation-dialog-inline-label">
-                    {convertI18nText(item.label, t)}
-                  </label>
-                  {value !== null && (
-                    <TwitterPicker
-                      color={value as string}
-                      triangle="hide"
-                      onChange={(result) => updateValue(index, result.hex)}
-                    />
-                  )}
-                </div>
-              );
-            } else if (item.type === "datetime") {
-              return (
-                <div
-                  key={index}
-                  className={classNames(
-                    "cru-operation-dialog-group",
-                    error != null ? "error" : null
-                  )}
-                >
-                  {item.label && (
-                    <label className="cru-operation-dialog-label">
-                      {convertI18nText(item.label, t)}
-                    </label>
-                  )}
-                  <input
-                    type="datetime-local"
-                    value={value as string}
-                    onChange={(e) => {
-                      const v = e.target.value;
-                      updateValue(index, v);
-                    }}
-                    disabled={process}
-                  />
-                  {error != null && <div>{error}</div>}
-                </div>
-              );
-            }
-          })}
-        </div>
-        <hr />
-        <div className="cru-dialog-bottom-area">
-          <Button
-            text="operationDialog.cancel"
-            color="secondary"
-            outline
-            onClick={close}
-            disabled={process}
-          />
-          <LoadingButton
-            color={props.themeColor}
-            loading={process}
-            disabled={!canProcess}
-            onClick={() => {
-              setDirtyList(inputScheme.map(() => true));
-              if (validate(values)) {
-                onConfirm();
-              }
-            }}
-          >
-            {t("operationDialog.confirm")}
-          </LoadingButton>
-        </div>
-      </>
-    );
-  } else {
-    let content: React.ReactNode;
-    const result = step;
-    if (result.type === "success") {
-      content =
-        props.successPrompt?.(result.data) ?? t("operationDialog.success");
-      if (typeof content === "string")
-        content = <p className="cru-color-success">{content}</p>;
-    } else {
-      content = props.failurePrompt?.(result.data) ?? <DefaultErrorPrompt />;
-      if (typeof content === "string")
-        content = <DefaultErrorPrompt error={content} />;
-    }
-    body = (
-      <>
-        <div>{content}</div>
-        <hr />
-        <div className="cru-dialog-bottom-area">
-          <Button text="operationDialog.ok" color="primary" onClick={close} />
-        </div>
-      </>
-    );
-  }
-
-  const title =
-    typeof props.title === "function"
-      ? props.title()
-      : convertI18nText(props.title, t);
-
-  return (
-    <Dialog open={props.open} onClose={close}>
-      <h3
-        className={
-          props.themeColor != null
-            ? "cru-color-" + props.themeColor
-            : "cru-color-primary"
-        }
-      >
-        {title}
-      </h3>
-      <hr />
-      {body}
-    </Dialog>
-  );
-};
-
-export default OperationDialog;
diff --git a/FrontEnd/src/views/common/index.css b/FrontEnd/src/views/common/index.css
deleted file mode 100644
index 111a3ec0..00000000
--- a/FrontEnd/src/views/common/index.css
+++ /dev/null
@@ -1,293 +0,0 @@
-:root {

-  --cru-background-color: #f8f9fa;

-  --cru-background-1-color: #e9ecef;

-  --cru-background-2-color: #dee2e6;

-

-  --cru-disable-color: #ced4da;

-

-  /*

-  --cru-primary-color: rgb(0, 123, 255);

-  --cru-primary-l1-color: rgb(26, 136, 255);

-  --cru-primary-l2-color: rgb(51, 149, 255);

-  --cru-primary-l3-color: rgb(77, 163, 255);

-  --cru-primary-d1-color: rgb(0, 111, 230);

-  --cru-primary-d2-color: rgb(0, 98, 204);

-  --cru-primary-d3-color: rgb(0, 86, 179);

-  --cru-primary-f1-color: rgb(0, 111, 230);

-  --cru-primary-f2-color: rgb(0, 98, 204);

-  --cru-primary-f3-color: rgb(0, 86, 179);

-  --cru-primary-r1-color: rgb(26, 136, 255);

-  --cru-primary-r2-color: rgb(51, 149, 255);

-  --cru-primary-r3-color: rgb(77, 163, 255);

-  --cru-primary-t-color: rgb(255, 255, 255);

-  --cru-primary-t1-color: rgb(230, 230, 230);

-  --cru-primary-t2-color: rgb(204, 204, 204);

-  --cru-primary-t3-color: rgb(179, 179, 179);

-  --cru-primary-enhance-color: rgb(77, 163, 255);

-  --cru-primary-enhance-l1-color: rgb(94, 172, 255);

-  --cru-primary-enhance-l2-color: rgb(112, 181, 255);

-  --cru-primary-enhance-l3-color: rgb(130, 190, 255);

-  --cru-primary-enhance-d1-color: rgb(43, 145, 255);

-  --cru-primary-enhance-d2-color: rgb(10, 128, 255);

-  --cru-primary-enhance-d3-color: rgb(0, 112, 232);

-  --cru-primary-enhance-f1-color: rgb(94, 172, 255);

-  --cru-primary-enhance-f2-color: rgb(112, 181, 255);

-  --cru-primary-enhance-f3-color: rgb(130, 190, 255);

-  --cru-primary-enhance-r1-color: rgb(43, 145, 255);

-  --cru-primary-enhance-r2-color: rgb(10, 128, 255);

-  --cru-primary-enhance-r3-color: rgb(0, 112, 232);

-  --cru-primary-enhance-t-color: rgb(0, 0, 0);

-  --cru-primary-enhance-t1-color: rgb(26, 26, 26);

-  --cru-primary-enhance-t2-color: rgb(51, 51, 51);

-  --cru-primary-enhance-t3-color: rgb(77, 77, 77);

-  --cru-secondary-color: rgb(128, 128, 128);

-  --cru-secondary-l1-color: rgb(141, 141, 141);

-  --cru-secondary-l2-color: rgb(153, 153, 153);

-  --cru-secondary-l3-color: rgb(166, 166, 166);

-  --cru-secondary-d1-color: rgb(115, 115, 115);

-  --cru-secondary-d2-color: rgb(102, 102, 102);

-  --cru-secondary-d3-color: rgb(90, 90, 90);

-  --cru-secondary-f1-color: rgb(115, 115, 115);

-  --cru-secondary-f2-color: rgb(102, 102, 102);

-  --cru-secondary-f3-color: rgb(90, 90, 90);

-  --cru-secondary-r1-color: rgb(141, 141, 141);

-  --cru-secondary-r2-color: rgb(153, 153, 153);

-  --cru-secondary-r3-color: rgb(166, 166, 166);

-  --cru-secondary-t-color: rgb(255, 255, 255);

-  --cru-secondary-t1-color: rgb(230, 230, 230);

-  --cru-secondary-t2-color: rgb(204, 204, 204);

-  --cru-secondary-t3-color: rgb(179, 179, 179);

-  --cru-danger-color: rgb(255, 0, 0);

-  --cru-danger-l1-color: rgb(255, 26, 26);

-  --cru-danger-l2-color: rgb(255, 51, 51);

-  --cru-danger-l3-color: rgb(255, 77, 77);

-  --cru-danger-d1-color: rgb(230, 0, 0);

-  --cru-danger-d2-color: rgb(204, 0, 0);

-  --cru-danger-d3-color: rgb(179, 0, 0);

-  --cru-danger-f1-color: rgb(230, 0, 0);

-  --cru-danger-f2-color: rgb(204, 0, 0);

-  --cru-danger-f3-color: rgb(179, 0, 0);

-  --cru-danger-r1-color: rgb(255, 26, 26);

-  --cru-danger-r2-color: rgb(255, 51, 51);

-  --cru-danger-r3-color: rgb(255, 77, 77);

-  --cru-danger-t-color: rgb(255, 255, 255);

-  --cru-danger-t1-color: rgb(230, 230, 230);

-  --cru-danger-t2-color: rgb(204, 204, 204);

-  --cru-danger-t3-color: rgb(179, 179, 179);

-  --cru-success-color: rgb(0, 128, 0);

-  --cru-success-l1-color: rgb(0, 166, 0);

-  --cru-success-l2-color: rgb(0, 204, 0);

-  --cru-success-l3-color: rgb(0, 243, 0);

-  --cru-success-d1-color: rgb(0, 115, 0);

-  --cru-success-d2-color: rgb(0, 102, 0);

-  --cru-success-d3-color: rgb(0, 90, 0);

-  --cru-success-f1-color: rgb(0, 115, 0);

-  --cru-success-f2-color: rgb(0, 102, 0);

-  --cru-success-f3-color: rgb(0, 90, 0);

-  --cru-success-r1-color: rgb(0, 166, 0);

-  --cru-success-r2-color: rgb(0, 204, 0);

-  --cru-success-r3-color: rgb(0, 243, 0);

-  --cru-success-t-color: rgb(255, 255, 255);

-  --cru-success-t1-color: rgb(230, 230, 230);

-  --cru-success-t2-color: rgb(204, 204, 204);

-  --cru-success-t3-color: rgb(179, 179, 179);

-  */

-}

-

-.cru-primary {

-  --cru-theme-color: var(--cru-primary-color);

-  --cru-theme-l1-color: var(--cru-primary-l1-color);

-  --cru-theme-l2-color: var(--cru-primary-l2-color);

-  --cru-theme-l3-color: var(--cru-primary-l3-color);

-  --cru-theme-d1-color: var(--cru-primary-d1-color);

-  --cru-theme-d2-color: var(--cru-primary-d2-color);

-  --cru-theme-d3-color: var(--cru-primary-d3-color);

-  --cru-theme-f1-color: var(--cru-primary-f1-color);

-  --cru-theme-f2-color: var(--cru-primary-f2-color);

-  --cru-theme-f3-color: var(--cru-primary-f3-color);

-  --cru-theme-r1-color: var(--cru-primary-r1-color);

-  --cru-theme-r2-color: var(--cru-primary-r2-color);

-  --cru-theme-r3-color: var(--cru-primary-r3-color);

-  --cru-theme-t-color: var(--cru-primary-t-color);

-  --cru-theme-t1-color: var(--cru-primary-t1-color);

-  --cru-theme-t2-color: var(--cru-primary-t2-color);

-  --cru-theme-t3-color: var(--cru-primary-t3-color);

-}

-

-.cru-primary-enhance {

-  --cru-theme-color: var(--cru-primary-enhance-color);

-  --cru-theme-l1-color: var(--cru-primary-enhance-l1-color);

-  --cru-theme-l2-color: var(--cru-primary-enhance-l2-color);

-  --cru-theme-l3-color: var(--cru-primary-enhance-l3-color);

-  --cru-theme-d1-color: var(--cru-primary-enhance-d1-color);

-  --cru-theme-d2-color: var(--cru-primary-enhance-d2-color);

-  --cru-theme-d3-color: var(--cru-primary-enhance-d3-color);

-  --cru-theme-f1-color: var(--cru-primary-enhance-f1-color);

-  --cru-theme-f2-color: var(--cru-primary-enhance-f2-color);

-  --cru-theme-f3-color: var(--cru-primary-enhance-f3-color);

-  --cru-theme-r1-color: var(--cru-primary-enhance-r1-color);

-  --cru-theme-r2-color: var(--cru-primary-enhance-r2-color);

-  --cru-theme-r3-color: var(--cru-primary-enhance-r3-color);

-  --cru-theme-t-color: var(--cru-primary-enhance-t-color);

-  --cru-theme-t1-color: var(--cru-primary-enhance-t1-color);

-  --cru-theme-t2-color: var(--cru-primary-enhance-t2-color);

-  --cru-theme-t3-color: var(--cru-primary-enhance-t3-color);

-}

-

-.cru-secondary {

-  --cru-theme-color: var(--cru-secondary-color);

-  --cru-theme-l1-color: var(--cru-secondary-l1-color);

-  --cru-theme-l2-color: var(--cru-secondary-l2-color);

-  --cru-theme-l3-color: var(--cru-secondary-l3-color);

-  --cru-theme-d1-color: var(--cru-secondary-d1-color);

-  --cru-theme-d2-color: var(--cru-secondary-d2-color);

-  --cru-theme-d3-color: var(--cru-secondary-d3-color);

-  --cru-theme-f1-color: var(--cru-secondary-f1-color);

-  --cru-theme-f2-color: var(--cru-secondary-f2-color);

-  --cru-theme-f3-color: var(--cru-secondary-f3-color);

-  --cru-theme-r1-color: var(--cru-secondary-r1-color);

-  --cru-theme-r2-color: var(--cru-secondary-r2-color);

-  --cru-theme-r3-color: var(--cru-secondary-r3-color);

-  --cru-theme-t-color: var(--cru-secondary-t-color);

-  --cru-theme-t1-color: var(--cru-secondary-t1-color);

-  --cru-theme-t2-color: var(--cru-secondary-t2-color);

-  --cru-theme-t3-color: var(--cru-secondary-t3-color);

-}

-

-.cru-success {

-  --cru-theme-color: var(--cru-success-color);

-  --cru-theme-l1-color: var(--cru-success-l1-color);

-  --cru-theme-l2-color: var(--cru-success-l2-color);

-  --cru-theme-l3-color: var(--cru-success-l3-color);

-  --cru-theme-d1-color: var(--cru-success-d1-color);

-  --cru-theme-d2-color: var(--cru-success-d2-color);

-  --cru-theme-d3-color: var(--cru-success-d3-color);

-  --cru-theme-f1-color: var(--cru-success-f1-color);

-  --cru-theme-f2-color: var(--cru-success-f2-color);

-  --cru-theme-f3-color: var(--cru-success-f3-color);

-  --cru-theme-r1-color: var(--cru-success-r1-color);

-  --cru-theme-r2-color: var(--cru-success-r2-color);

-  --cru-theme-r3-color: var(--cru-success-r3-color);

-  --cru-theme-t-color: var(--cru-success-t-color);

-  --cru-theme-t1-color: var(--cru-success-t1-color);

-  --cru-theme-t2-color: var(--cru-success-t2-color);

-  --cru-theme-t3-color: var(--cru-success-t3-color);

-}

-

-.cru-danger {

-  --cru-theme-color: var(--cru-danger-color);

-  --cru-theme-l1-color: var(--cru-danger-l1-color);

-  --cru-theme-l2-color: var(--cru-danger-l2-color);

-  --cru-theme-l3-color: var(--cru-danger-l3-color);

-  --cru-theme-d1-color: var(--cru-danger-d1-color);

-  --cru-theme-d2-color: var(--cru-danger-d2-color);

-  --cru-theme-d3-color: var(--cru-danger-d3-color);

-  --cru-theme-f1-color: var(--cru-danger-f1-color);

-  --cru-theme-f2-color: var(--cru-danger-f2-color);

-  --cru-theme-f3-color: var(--cru-danger-f3-color);

-  --cru-theme-r1-color: var(--cru-danger-r1-color);

-  --cru-theme-r2-color: var(--cru-danger-r2-color);

-  --cru-theme-r3-color: var(--cru-danger-r3-color);

-  --cru-theme-t-color: var(--cru-danger-t-color);

-  --cru-theme-t1-color: var(--cru-danger-t1-color);

-  --cru-theme-t2-color: var(--cru-danger-t2-color);

-  --cru-theme-t3-color: var(--cru-danger-t3-color);

-}

-

-.cru-color-primary {

-  color: var(--cru-primary-color);

-}

-

-.cru-color-primary-enhance {

-  color: var(--cru-primary-enhance-color);

-}

-

-.cru-color-secondary {

-  color: var(--cru-secondary-color);

-}

-

-.cru-color-success {

-  color: var(--cru-success-color);

-}

-

-.cru-color-danger {

-  color: var(--cru-danger-color);

-}

-

-.cru-text-center {

-  text-align: center;

-}

-

-.cru-text-end {

-  text-align: end;

-}

-

-.cru-float-left {

-  float: left;

-}

-

-.cru-float-right {

-  float: right;

-}

-

-.cru-align-text-bottom {

-  vertical-align: text-bottom;

-}

-

-.cru-align-middle {

-  vertical-align: middle;

-}

-

-.cru-clearfix::after {

-  clear: both;

-}

-

-.cru-fill-parent {

-  width: 100%;

-  height: 100%;

-}

-

-.cru-avatar {

-  width: 60px;

-  height: 60px;

-}

-

-.cru-avatar.large {

-  width: 100px;

-  height: 100px;

-}

-

-.cru-avatar.small {

-  width: 40px;

-  height: 40px;

-}

-

-.cru-round {

-  border-radius: 50%;

-}

-

-.cru-tab-pages-action-area {

-  display: flex;

-  align-items: center;

-}

-

-.alert-container {

-  position: fixed;

-  z-index: 1070;

-}

-

-@media (min-width: 576px) {

-  .alert-container {

-    bottom: 0;

-    right: 0;

-  }

-}

-

-@media (max-width: 575.98px) {

-  .alert-container {

-    bottom: 0;

-    right: 0;

-    left: 0;

-    text-align: center;

-  }

-}
\ No newline at end of file
diff --git a/FrontEnd/src/views/common/input/InputPanel.css b/FrontEnd/src/views/common/input/InputPanel.css
deleted file mode 100644
index f9d6ac8b..00000000
--- a/FrontEnd/src/views/common/input/InputPanel.css
+++ /dev/null
@@ -1,25 +0,0 @@
-.cru-input-panel-group {
-  display: block;
-  margin: 0.4em 0;
-}
-
-.cru-input-panel-label {
-  display: block;
-  color: var(--cru-primary-color);
-}
-
-.cru-input-panel-inline-label {
-  margin-inline-start: 0.5em;
-}
-
-.cru-input-panel-error-text {
-  display: block;
-  font-size: 0.8em;
-  color: var(--cru-danger-color);
-}
-
-.cru-input-panel-helper-text {
-  display: block;
-  font-size: 0.8em;
-  color: var(--cru-primary-color);
-}
diff --git a/FrontEnd/src/views/common/input/InputPanel.tsx b/FrontEnd/src/views/common/input/InputPanel.tsx
deleted file mode 100644
index 234ed267..00000000
--- a/FrontEnd/src/views/common/input/InputPanel.tsx
+++ /dev/null
@@ -1,257 +0,0 @@
-import * as React from "react";
-import classNames from "classnames";
-import { useTranslation } from "react-i18next";
-import { TwitterPicker } from "react-color";
-
-import { convertI18nText, I18nText } from "@/common";
-
-import "./InputPanel.css";
-
-export interface TextInput {
-  type: "text";
-  label?: I18nText;
-  helper?: I18nText;
-  password?: boolean;
-}
-
-export interface BoolInput {
-  type: "bool";
-  label: I18nText;
-  helper?: I18nText;
-}
-
-export interface SelectInputOption {
-  value: string;
-  label: I18nText;
-  icon?: React.ReactElement;
-}
-
-export interface SelectInput {
-  type: "select";
-  label: I18nText;
-  options: SelectInputOption[];
-}
-
-export interface ColorInput {
-  type: "color";
-  label?: I18nText;
-}
-
-export interface DateTimeInput {
-  type: "datetime";
-  label?: I18nText;
-  helper?: I18nText;
-}
-
-export type Input =
-  | TextInput
-  | BoolInput
-  | SelectInput
-  | ColorInput
-  | DateTimeInput;
-
-interface InputTypeToValueTypeMap {
-  text: string;
-  bool: boolean;
-  select: string;
-  color: string;
-  datetime: string;
-}
-
-type ValueTypes = InputTypeToValueTypeMap[keyof InputTypeToValueTypeMap];
-
-type MapInputTypeToValueType<Type> = Type extends keyof InputTypeToValueTypeMap
-  ? InputTypeToValueTypeMap[Type]
-  : never;
-
-type MapInputToValueType<T> = T extends Input
-  ? MapInputTypeToValueType<T["type"]>
-  : T;
-
-type MapInputListToValueTypeList<Tuple extends readonly Input[]> = {
-  [Index in keyof Tuple]: MapInputToValueType<Tuple[Index]>;
-} & { length: Tuple["length"] };
-
-export type InputPanelError = {
-  [index: number]: I18nText | null | undefined;
-};
-
-export function hasError(e: InputPanelError | null | undefined): boolean {
-  if (e == null) return false;
-  for (const key of Object.keys(e)) {
-    if (e[key as unknown as number] != null) return true;
-  }
-  return false;
-}
-
-export interface InputPanelProps<InputList extends readonly Input[]> {
-  scheme: InputList;
-  values: MapInputListToValueTypeList<InputList>;
-  onChange: (
-    values: MapInputListToValueTypeList<InputList>,
-    index: number
-  ) => void;
-  error?: InputPanelError;
-  disable?: boolean;
-}
-
-const InputPanel = <InputList extends readonly Input[]>(
-  props: InputPanelProps<InputList>
-): React.ReactElement => {
-  const { values, onChange, scheme, error, disable } = props;
-
-  const { t } = useTranslation();
-
-  const updateValue = (index: number, newValue: ValueTypes): void => {
-    const oldValues = values;
-    const newValues = oldValues.slice();
-    newValues[index] = newValue;
-    onChange(
-      newValues as unknown as MapInputListToValueTypeList<InputList>,
-      index
-    );
-  };
-
-  return (
-    <div>
-      {scheme.map((item, index) => {
-        const v = values[index];
-        const e: string | null = convertI18nText(error?.[index], t);
-
-        if (item.type === "text") {
-          return (
-            <div
-              key={index}
-              className={classNames("cru-input-panel-group", e && "error")}
-            >
-              {item.label && (
-                <label className="cru-input-panel-label">
-                  {convertI18nText(item.label, t)}
-                </label>
-              )}
-              <input
-                type={item.password === true ? "password" : "text"}
-                value={v as string}
-                onChange={(e) => {
-                  const v = e.target.value;
-                  updateValue(index, v);
-                }}
-                disabled={disable}
-              />
-              {e && <div className="cru-input-panel-error-text">{e}</div>}
-              {item.helper && (
-                <div className="cru-input-panel-helper-text">
-                  {convertI18nText(item.helper, t)}
-                </div>
-              )}
-            </div>
-          );
-        } else if (item.type === "bool") {
-          return (
-            <div
-              key={index}
-              className={classNames("cru-input-panel-group", e && "error")}
-            >
-              <input
-                type="checkbox"
-                checked={v as boolean}
-                onChange={(event) => {
-                  const value = event.currentTarget.checked;
-                  updateValue(index, value);
-                }}
-                disabled={disable}
-              />
-              <label className="cru-input-panel-inline-label">
-                {convertI18nText(item.label, t)}
-              </label>
-              {e != null && (
-                <div className="cru-input-panel-error-text">{e}</div>
-              )}
-              {item.helper && (
-                <div className="cru-input-panel-helper-text">
-                  {convertI18nText(item.helper, t)}
-                </div>
-              )}
-            </div>
-          );
-        } else if (item.type === "select") {
-          return (
-            <div
-              key={index}
-              className={classNames("cru-input-panel-group", e && "error")}
-            >
-              <label className="cru-input-panel-label">
-                {convertI18nText(item.label, t)}
-              </label>
-              <select
-                value={v as string}
-                onChange={(event) => {
-                  const value = event.target.value;
-                  updateValue(index, value);
-                }}
-                disabled={disable}
-              >
-                {item.options.map((option, i) => {
-                  return (
-                    <option value={option.value} key={i}>
-                      {option.icon}
-                      {convertI18nText(option.label, t)}
-                    </option>
-                  );
-                })}
-              </select>
-            </div>
-          );
-        } else if (item.type === "color") {
-          return (
-            <div
-              key={index}
-              className={classNames("cru-input-panel-group", e && "error")}
-            >
-              <label className="cru-input-panel-inline-label">
-                {convertI18nText(item.label, t)}
-              </label>
-              <TwitterPicker
-                color={v as string}
-                triangle="hide"
-                onChange={(result) => updateValue(index, result.hex)}
-              />
-            </div>
-          );
-        } else if (item.type === "datetime") {
-          return (
-            <div
-              key={index}
-              className={classNames("cru-input-panel-group", e && "error")}
-            >
-              {item.label && (
-                <label className="cru-input-panel-label">
-                  {convertI18nText(item.label, t)}
-                </label>
-              )}
-              <input
-                type="datetime-local"
-                value={v as string}
-                onChange={(e) => {
-                  const v = e.target.value;
-                  updateValue(index, v);
-                }}
-                disabled={disable}
-              />
-              {e != null && (
-                <div className="cru-input-panel-error-text">{e}</div>
-              )}
-              {item.helper && (
-                <div className="cru-input-panel-helper-text">
-                  {convertI18nText(item.helper, t)}
-                </div>
-              )}
-            </div>
-          );
-        }
-      })}
-    </div>
-  );
-};
-
-export default InputPanel;
diff --git a/FrontEnd/src/views/common/menu/Menu.css b/FrontEnd/src/views/common/menu/Menu.css
deleted file mode 100644
index c3fa82c4..00000000
--- a/FrontEnd/src/views/common/menu/Menu.css
+++ /dev/null
@@ -1,24 +0,0 @@
-.cru-menu {

-  min-width: 200px;

-}

-

-.cru-menu-item {

-  font-size: 1em;

-  padding: 0.5em 1.5em;

-  cursor: pointer;

-  transition: all 0.5s;

-  color: var(--cru-theme-color);

-}

-

-.cru-menu-item:hover {

-  color: var(--cru-theme-t-color);

-  background-color: var(--cru-theme-color);

-}

-

-.cru-menu-item-icon {

-  margin-right: 1em;

-}

-

-.cru-menu-divider {

-  border-top: 1px solid #e9ecef;

-}

diff --git a/FrontEnd/src/views/common/menu/Menu.tsx b/FrontEnd/src/views/common/menu/Menu.tsx
deleted file mode 100644
index de3b1664..00000000
--- a/FrontEnd/src/views/common/menu/Menu.tsx
+++ /dev/null
@@ -1,72 +0,0 @@
-import * as React from "react";
-import classnames from "classnames";
-import { useTranslation } from "react-i18next";
-
-import { convertI18nText, I18nText } from "@/common";
-import { PaletteColorType } from "@/palette";
-
-import "./Menu.css";
-
-export type MenuItem =
-  | {
-      type: "divider";
-    }
-  | {
-      type: "button";
-      text: I18nText;
-      iconClassName?: string;
-      color?: PaletteColorType;
-      onClick: () => void;
-    };
-
-export type MenuItems = MenuItem[];
-
-export type MenuProps = {
-  items: MenuItems;
-  onItemClicked?: () => void;
-  className?: string;
-  style?: React.CSSProperties;
-};
-
-export default function _Menu({
-  items,
-  onItemClicked,
-  className,
-  style,
-}: MenuProps): React.ReactElement | null {
-  const { t } = useTranslation();
-
-  return (
-    <div className={classnames("cru-menu", className)} style={style}>
-      {items.map((item, index) => {
-        if (item.type === "divider") {
-          return <div key={index} className="cru-menu-divider" />;
-        } else {
-          return (
-            <div
-              key={index}
-              className={classnames(
-                "cru-menu-item",
-                `cru-${item.color ?? "primary"}`
-              )}
-              onClick={() => {
-                item.onClick();
-                onItemClicked?.();
-              }}
-            >
-              {item.iconClassName != null ? (
-                <i
-                  className={classnames(
-                    item.iconClassName,
-                    "cru-menu-item-icon"
-                  )}
-                />
-              ) : null}
-              {convertI18nText(item.text, t)}
-            </div>
-          );
-        }
-      })}
-    </div>
-  );
-}
diff --git a/FrontEnd/src/views/common/menu/PopupMenu.css b/FrontEnd/src/views/common/menu/PopupMenu.css
deleted file mode 100644
index f6654f68..00000000
--- a/FrontEnd/src/views/common/menu/PopupMenu.css
+++ /dev/null
@@ -1,6 +0,0 @@
-.cru-popup-menu-menu-container {

-  z-index: 1040;

-  border-radius: 5px;

-  border: var(--cru-primary-color) 1px solid;

-  background-color: white;

-}

diff --git a/FrontEnd/src/views/common/menu/PopupMenu.tsx b/FrontEnd/src/views/common/menu/PopupMenu.tsx
deleted file mode 100644
index 74ca7aba..00000000
--- a/FrontEnd/src/views/common/menu/PopupMenu.tsx
+++ /dev/null
@@ -1,71 +0,0 @@
-import classNames from "classnames";
-import * as React from "react";
-import { createPortal } from "react-dom";
-import { usePopper } from "react-popper";
-
-import { useClickOutside } from "@/utilities/hooks";
-
-import Menu, { MenuItems } from "./Menu";
-
-import "./PopupMenu.css";
-
-export interface PopupMenuProps {
-  items: MenuItems;
-  children?: React.ReactNode;
-  containerClassName?: string;
-  containerStyle?: React.CSSProperties;
-}
-
-const PopupMenu: React.FC<PopupMenuProps> = ({
-  items,
-  children,
-  containerClassName,
-  containerStyle,
-}) => {
-  const [show, setShow] = React.useState<boolean>(false);
-
-  const [referenceElement, setReferenceElement] =
-    React.useState<HTMLDivElement | null>(null);
-  const [popperElement, setPopperElement] =
-    React.useState<HTMLDivElement | null>(null);
-  const { styles, attributes } = usePopper(referenceElement, popperElement);
-
-  useClickOutside(popperElement, () => setShow(false), true);
-
-  return (
-    <>
-      <div
-        ref={setReferenceElement}
-        className={classNames(
-          "cru-popup-menu-trigger-container",
-          containerClassName
-        )}
-        style={containerStyle}
-        onClick={() => setShow(true)}
-      >
-        {children}
-      </div>
-      {show
-        ? createPortal(
-            <div
-              ref={setPopperElement}
-              className="cru-popup-menu-menu-container"
-              style={styles.popper}
-              {...attributes.popper}
-            >
-              <Menu
-                items={items}
-                onItemClicked={() => {
-                  setShow(false);
-                }}
-              />
-            </div>,
-            // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
-            document.getElementById("portal")!
-          )
-        : null}
-    </>
-  );
-};
-
-export default PopupMenu;
diff --git a/FrontEnd/src/views/common/tab/TabPages.tsx b/FrontEnd/src/views/common/tab/TabPages.tsx
deleted file mode 100644
index cdb988e0..00000000
--- a/FrontEnd/src/views/common/tab/TabPages.tsx
+++ /dev/null
@@ -1,71 +0,0 @@
-import * as React from "react";
-
-import { I18nText, UiLogicError } from "@/common";
-
-import Tabs from "./Tabs";
-
-export interface TabPage {
-  name: string;
-  text: I18nText;
-  page: React.ReactNode;
-}
-
-export interface TabPagesProps {
-  pages: TabPage[];
-  actions?: React.ReactNode;
-  dense?: boolean;
-  className?: string;
-  style?: React.CSSProperties;
-  navClassName?: string;
-  navStyle?: React.CSSProperties;
-  pageContainerClassName?: string;
-  pageContainerStyle?: React.CSSProperties;
-}
-
-const TabPages: React.FC<TabPagesProps> = ({
-  pages,
-  actions,
-  dense,
-  className,
-  style,
-  navClassName,
-  navStyle,
-  pageContainerClassName,
-  pageContainerStyle,
-}) => {
-  if (pages.length === 0) {
-    throw new UiLogicError("Page list can't be empty.");
-  }
-
-  const [tab, setTab] = React.useState<string>(pages[0].name);
-
-  const currentPage = pages.find((p) => p.name === tab);
-
-  if (currentPage == null) {
-    throw new UiLogicError("Current tab value is bad.");
-  }
-
-  return (
-    <div className={className} style={style}>
-      <Tabs
-        tabs={pages.map((page) => ({
-          name: page.name,
-          text: page.text,
-          onClick: () => {
-            setTab(page.name);
-          },
-        }))}
-        dense={dense}
-        activeTabName={tab}
-        className={navClassName}
-        style={navStyle}
-        actions={actions}
-      />
-      <div className={pageContainerClassName} style={pageContainerStyle}>
-        {currentPage.page}
-      </div>
-    </div>
-  );
-};
-
-export default TabPages;
diff --git a/FrontEnd/src/views/common/tab/Tabs.css b/FrontEnd/src/views/common/tab/Tabs.css
deleted file mode 100644
index 395d16a7..00000000
--- a/FrontEnd/src/views/common/tab/Tabs.css
+++ /dev/null
@@ -1,33 +0,0 @@
-.cru-nav {

-  border-bottom: var(--cru-primary-color) 1px solid;

-  display: flex;

-}

-

-.cru-nav-item {

-  color: var(--cru-primary-color);

-  border: var(--cru-background-2-color) 0.5px solid;

-  border-bottom: none;

-  padding: 0.5em 1.5em;

-  border-top-left-radius: 5px;

-  border-top-right-radius: 5px;

-  transition: all 0.5s;

-  cursor: pointer;

-}

-

-.cru-nav.dense .cru-nav-item {

-  padding: 0.2em 1em;

-}

-

-.cru-nav-item:hover {

-  background-color: var(--cru-background-1-color);

-}

-

-.cru-nav-item.active {

-  color: var(--cru-primary-t-color);

-  background-color: var(--cru-primary-color);

-  border-color: var(--cru-primary-color);

-}

-

-.cru-nav-action-area {

-  margin-left: auto;

-}

diff --git a/FrontEnd/src/views/common/tab/Tabs.tsx b/FrontEnd/src/views/common/tab/Tabs.tsx
deleted file mode 100644
index 3e3ef6fa..00000000
--- a/FrontEnd/src/views/common/tab/Tabs.tsx
+++ /dev/null
@@ -1,62 +0,0 @@
-import * as React from "react";
-import { Link } from "react-router-dom";
-import { useTranslation } from "react-i18next";
-import classnames from "classnames";
-
-import { convertI18nText, I18nText } from "@/common";
-
-import "./Tabs.css";
-
-export interface Tab {
-  name: string;
-  text: I18nText;
-  link?: string;
-  onClick?: () => void;
-}
-
-export interface TabsProps {
-  activeTabName?: string;
-  actions?: React.ReactNode;
-  dense?: boolean;
-  tabs: Tab[];
-  className?: string;
-  style?: React.CSSProperties;
-}
-
-export default function Tabs(props: TabsProps): React.ReactElement | null {
-  const { tabs, activeTabName, className, style, dense, actions } = props;
-
-  const { t } = useTranslation();
-
-  return (
-    <div
-      className={classnames("cru-nav", dense && "dense", className)}
-      style={style}
-    >
-      {tabs.map((tab) => {
-        const active = activeTabName === tab.name;
-        const className = classnames("cru-nav-item", active && "active");
-
-        if (tab.link != null) {
-          return (
-            <Link
-              key={tab.name}
-              to={tab.link}
-              onClick={tab.onClick}
-              className={className}
-            >
-              {convertI18nText(tab.text, t)}
-            </Link>
-          );
-        } else {
-          return (
-            <span key={tab.name} onClick={tab.onClick} className={className}>
-              {convertI18nText(tab.text, t)}
-            </span>
-          );
-        }
-      })}
-      <div className="cru-nav-action-area">{actions}</div>
-    </div>
-  );
-}
diff --git a/FrontEnd/src/views/common/user/UserAvatar.tsx b/FrontEnd/src/views/common/user/UserAvatar.tsx
deleted file mode 100644
index fcff8c69..00000000
--- a/FrontEnd/src/views/common/user/UserAvatar.tsx
+++ /dev/null
@@ -1,19 +0,0 @@
-import * as React from "react";
-
-import { getHttpUserClient } from "@/http/user";
-
-export interface UserAvatarProps
-  extends React.ImgHTMLAttributes<HTMLImageElement> {
-  username: string;
-}
-
-const UserAvatar: React.FC<UserAvatarProps> = ({ username, ...otherProps }) => {
-  return (
-    <img
-      src={getHttpUserClient().generateAvatarUrl(username)}
-      {...otherProps}
-    />
-  );
-};
-
-export default UserAvatar;
diff --git a/FrontEnd/src/views/home/TimelineListView.tsx b/FrontEnd/src/views/home/TimelineListView.tsx
deleted file mode 100644
index fbcdc9b0..00000000
--- a/FrontEnd/src/views/home/TimelineListView.tsx
+++ /dev/null
@@ -1,97 +0,0 @@
-import * as React from "react";
-import { useTranslation } from "react-i18next";
-import { Link } from "react-router-dom";
-
-import { convertI18nText, I18nText } from "@/common";
-
-import { TimelineBookmark } from "@/http/bookmark";
-
-import IconButton from "../common/button/IconButton";
-
-interface TimelineListItemProps {
-  timeline: TimelineBookmark;
-}
-
-const TimelineListItem: React.FC<TimelineListItemProps> = ({ timeline }) => {
-  return (
-    <div className="home-timeline-list-item home-timeline-list-item-timeline">
-      <svg className="home-timeline-list-item-line" viewBox="0 0 120 100">
-        <path
-          d="M 80,50 m 0,-12 a 12 12 180 1 1 0,24 12 12 180 1 1 0,-24 z M 60,0 h 40 v 100 h -40 z"
-          fillRule="evenodd"
-          fill="#007bff"
-        />
-      </svg>
-      <div>
-        {timeline.timelineOwner}/{timeline.timelineName}
-      </div>
-      <Link to={`${timeline.timelineOwner}/${timeline.timelineName}`}>
-        <IconButton icon="arrow-right" className="ms-3" />
-      </Link>
-    </div>
-  );
-};
-
-const TimelineListArrow: React.FC = () => {
-  return (
-    <div>
-      <div className="home-timeline-list-item">
-        <svg className="home-timeline-list-item-line" viewBox="0 0 120 60">
-          <path d="M 60,0 h 40 v 20 l -20,20 l -20,-20 z" fill="#007bff" />
-        </svg>
-      </div>
-      <div className="home-timeline-list-item">
-        <svg
-          className="home-timeline-list-item-line home-timeline-list-loading-head"
-          viewBox="0 0 120 40"
-        >
-          <path
-            d="M 60,10 l 20,20 l 20,-20"
-            fill="none"
-            stroke="#007bff"
-            strokeWidth="5"
-          />
-        </svg>
-      </div>
-    </div>
-  );
-};
-
-interface TimelineListViewProps {
-  headerText?: I18nText;
-  timelines?: TimelineBookmark[];
-}
-
-const TimelineListView: React.FC<TimelineListViewProps> = ({
-  headerText,
-  timelines,
-}) => {
-  const { t } = useTranslation();
-
-  return (
-    <div className="home-timeline-list">
-      <div className="home-timeline-list-item">
-        <svg className="home-timeline-list-item-line" viewBox="0 0 120 120">
-          <path
-            d="M 0,20 Q 80,20 80,80 l 0,40"
-            stroke="#007bff"
-            strokeWidth="40"
-            fill="none"
-          />
-        </svg>
-        <h3>{convertI18nText(headerText, t)}</h3>
-      </div>
-      {timelines != null
-        ? timelines.map((t) => (
-            <TimelineListItem
-              key={`${t.timelineOwner}/${t.timelineName}`}
-              timeline={t}
-            />
-          ))
-        : null}
-      <TimelineListArrow />
-    </div>
-  );
-};
-
-export default TimelineListView;
diff --git a/FrontEnd/src/views/home/WebsiteIntroduction.tsx b/FrontEnd/src/views/home/WebsiteIntroduction.tsx
deleted file mode 100644
index e843c325..00000000
--- a/FrontEnd/src/views/home/WebsiteIntroduction.tsx
+++ /dev/null
@@ -1,77 +0,0 @@
-import * as React from "react";
-import { useTranslation } from "react-i18next";
-import { Link } from "react-router-dom";
-
-const WebsiteIntroduction: React.FC<{
-  className?: string;
-  style?: React.CSSProperties;
-}> = ({ className, style }) => {
-  const { i18n } = useTranslation();
-
-  if (i18n.language.startsWith("zh")) {
-    return (
-      <div className={className} style={style}>
-        <h2>
-          欢迎来到<strong>时间线</strong>！🎉🎉🎉
-        </h2>
-        <p>
-          本网站由无数个独立的时间线构成，每一个时间线都是一个消息列表，类似于一个聊天软件（比如QQ）。
-        </p>
-        <p>
-          如果你拥有一个账号，<Link to="/login">登陆</Link>
-          后你可以自由地在属于你的时间线中发送内容，支持markdown和上传图片哦！你可以创建一个新的时间线来开启一个新的话题。你也可以设置相关权限，只让一部分人能看到时间线的内容。
-        </p>
-        <p>
-          如果你没有账号，那么你可以去浏览一下公开的时间线，比如下面这些站长设置的高光时间线。
-        </p>
-        <p>
-          鉴于这个网站在我的小型服务器上部署，所以没有开放注册。如果你也想把这个服务部署到自己的服务器上，你可以在
-          <Link to="/about">关于</Link>页面找到一些信息。
-        </p>
-        <p>
-          <small className="text-secondary">
-            这一段介绍是我的对象抱怨多次我的网站他根本看不明白之后加的，希望你能顺利看懂这个网站的逻辑！😅
-          </small>
-        </p>
-      </div>
-    );
-  } else {
-    return (
-      <div className={className} style={style}>
-        <h2>
-          Welcome to <strong>Timeline</strong>!🎉🎉🎉
-        </h2>
-        <p>
-          This website consists of many individual timelines. Each timeline is a
-          list of messages just like a chat app.
-        </p>
-        <p>
-          If you do have an account, you can <Link to="/login">login</Link> and
-          post messages, which supports Markdown and images, in your timelines.
-          You can also create a new timeline to open a new topic. You can set
-          the permission of a timeline to only allow specified people to see the
-          content of the timeline.
-        </p>
-        <p>
-          If you don&apos;t have an account, you can view some public timelines
-          like highlight timelines below set by website manager.
-        </p>
-        <p>
-          Since this website is hosted on my tiny server, so account registry is
-          not opened. If you want to host this service on your own server, you
-          can find some useful information on <Link to="/about">about</Link>{" "}
-          page.
-        </p>
-        <p>
-          <small className="text-secondary">
-            This introduction is added after my lover complained a lot of times
-            about the obscuration of my website. May you understand the logic of
-            it!😅
-          </small>
-        </p>
-      </div>
-    );
-  }
-};
-
-export default WebsiteIntroduction;
diff --git a/FrontEnd/src/views/home/index.css b/FrontEnd/src/views/home/index.css
deleted file mode 100644
index 89d36f0d..00000000
--- a/FrontEnd/src/views/home/index.css
+++ /dev/null
@@ -1,42 +0,0 @@
-.home-timeline-list-item {

-  display: flex;

-  align-items: center;

-}

-

-.home-timeline-list-item-timeline {

-  transition: background 0.8s;

-  animation: 0.8s home-timeline-list-item-timeline-enter;

-}

-.home-timeline-list-item-timeline:hover {

-  background: #e9ecef;

-}

-

-@keyframes home-timeline-list-item-timeline-enter {

-  from {

-    transform: translate(-100%, 0);

-    opacity: 0;

-  }

-}

-.home-timeline-list-item-line {

-  width: 80px;

-  flex-shrink: 0;

-}

-

-@keyframes home-timeline-list-loading-head-animation {

-  from {

-    transform: translate(0, -30px);

-    opacity: 1;

-  }

-  to {

-    opacity: 0;

-  }

-}

-.home-timeline-list-loading-head {

-  animation: 1s infinite home-timeline-list-loading-head-animation;

-}

-

-@media (min-width: 576px) {

-  .home-search {

-    float: right;

-  }

-}

diff --git a/FrontEnd/src/views/home/index.tsx b/FrontEnd/src/views/home/index.tsx
deleted file mode 100644
index 3c80fb0c..00000000
--- a/FrontEnd/src/views/home/index.tsx
+++ /dev/null
@@ -1,78 +0,0 @@
-import * as React from "react";
-import { useNavigate } from "react-router-dom";
-
-import { highlightTimelineUsername } from "@/common";
-
-import { Page } from "@/http/common";
-import { getHttpBookmarkClient, TimelineBookmark } from "@/http/bookmark";
-
-import SearchInput from "../common/SearchInput";
-import TimelineListView from "./TimelineListView";
-import WebsiteIntroduction from "./WebsiteIntroduction";
-
-import "./index.css";
-
-const highlightTimelineMessageMap = {
-  loading: "home.loadingHighlightTimelines",
-  done: "home.loadedHighlightTimelines",
-  error: "home.errorHighlightTimelines",
-} as const;
-
-const HomeV2: React.FC = () => {
-  const navigate = useNavigate();
-
-  const [navText, setNavText] = React.useState<string>("");
-
-  const [highlightTimelineState, setHighlightTimelineState] = React.useState<
-    "loading" | "done" | "error"
-  >("loading");
-  const [highlightTimelines, setHighlightTimelines] = React.useState<
-    Page<TimelineBookmark> | undefined
-  >();
-
-  React.useEffect(() => {
-    if (highlightTimelineState === "loading") {
-      let subscribe = true;
-      void getHttpBookmarkClient()
-        .list(highlightTimelineUsername)
-        .then(
-          (data) => {
-            if (subscribe) {
-              setHighlightTimelineState("done");
-              setHighlightTimelines(data);
-            }
-          },
-          () => {
-            if (subscribe) {
-              setHighlightTimelineState("error");
-              setHighlightTimelines(undefined);
-            }
-          }
-        );
-      return () => {
-        subscribe = false;
-      };
-    }
-  }, [highlightTimelineState]);
-
-  return (
-    <>
-      <SearchInput
-        className="mx-2 my-3 home-search"
-        value={navText}
-        onChange={setNavText}
-        onButtonClick={() => {
-          navigate(`search?q=${navText}`);
-        }}
-        alwaysOneline
-      />
-      <WebsiteIntroduction className="m-2" />
-      <TimelineListView
-        headerText={highlightTimelineMessageMap[highlightTimelineState]}
-        timelines={highlightTimelines?.items}
-      />
-    </>
-  );
-};
-
-export default HomeV2;
diff --git a/FrontEnd/src/views/login/index.css b/FrontEnd/src/views/login/index.css
deleted file mode 100644
index aefe57e8..00000000
--- a/FrontEnd/src/views/login/index.css
+++ /dev/null
@@ -1,8 +0,0 @@
-.login-container {

-  max-width: 25em;

-}

-

-.login-container input[type="text"],

-.login-container input[type="password"] {

-  width: 100%;

-}

diff --git a/FrontEnd/src/views/login/index.tsx b/FrontEnd/src/views/login/index.tsx
deleted file mode 100644
index cc1d9865..00000000
--- a/FrontEnd/src/views/login/index.tsx
+++ /dev/null
@@ -1,159 +0,0 @@
-import * as React from "react";
-import { Link, useNavigate } from "react-router-dom";
-import { useTranslation, Trans } from "react-i18next";
-
-import { useUser, userService } from "@/services/user";
-
-import AppBar from "../common/AppBar";
-import LoadingButton from "../common/button/LoadingButton";
-
-import "./index.css";
-
-const LoginPage: React.FC = () => {
-  const { t } = useTranslation();
-
-  const navigate = useNavigate();
-
-  const [username, setUsername] = React.useState<string>("");
-  const [usernameDirty, setUsernameDirty] = React.useState<boolean>(false);
-  const [password, setPassword] = React.useState<string>("");
-  const [passwordDirty, setPasswordDirty] = React.useState<boolean>(false);
-  const [rememberMe, setRememberMe] = React.useState<boolean>(true);
-  const [process, setProcess] = React.useState<boolean>(false);
-  const [error, setError] = React.useState<string | null>(null);
-
-  const user = useUser();
-
-  React.useEffect(() => {
-    if (user != null) {
-      const id = setTimeout(() => navigate("/"), 3000);
-      return () => {
-        clearTimeout(id);
-      };
-    }
-  }, [navigate, user]);
-
-  if (user != null) {
-    return (
-      <>
-        <AppBar />
-        <p>{t("login.alreadyLogin")}</p>
-      </>
-    );
-  }
-
-  const submit = (): void => {
-    if (username === "" || password === "") {
-      setUsernameDirty(true);
-      setPasswordDirty(true);
-      return;
-    }
-
-    setProcess(true);
-    userService
-      .login(
-        {
-          username: username,
-          password: password,
-        },
-        rememberMe
-      )
-      .then(
-        () => {
-          if (history.length === 0) {
-            navigate("/");
-          } else {
-            navigate(-1);
-          }
-        },
-        (e: Error) => {
-          setProcess(false);
-          setError(e.message);
-        }
-      );
-  };
-
-  const onEnterPressInPassword: React.KeyboardEventHandler = (e) => {
-    if (e.key === "Enter") {
-      submit();
-    }
-  };
-
-  return (
-    <div className="login-container container-fluid mt-2">
-      <h1 className="cru-text-center cru-color-primary">{t("welcome")}</h1>
-      <div className="cru-operation-dialog-group">
-        <label className="cru-operation-dialog-label" htmlFor="username">
-          {t("user.username")}
-        </label>
-        <input
-          id="username"
-          type="text"
-          disabled={process}
-          onChange={(e) => {
-            setUsername(e.target.value);
-            setUsernameDirty(true);
-          }}
-          value={username}
-        />
-        {usernameDirty && username === "" && (
-          <div className="cru-operation-dialog-error-text">
-            {t("login.emptyUsername")}
-          </div>
-        )}
-      </div>
-      <div className="cru-operation-dialog-group">
-        <label className="cru-operation-dialog-label" htmlFor="password">
-          {t("user.password")}
-        </label>
-        <input
-          id="password"
-          type="password"
-          disabled={process}
-          onChange={(e) => {
-            setPassword(e.target.value);
-            setPasswordDirty(true);
-          }}
-          value={password}
-          onKeyDown={onEnterPressInPassword}
-        />
-        {passwordDirty && password === "" && (
-          <div className="cru-operation-dialog-error-text">
-            {t("login.emptyPassword")}
-          </div>
-        )}
-      </div>
-      <div className="cru-operation-dialog-group">
-        <input
-          id="remember-me"
-          type="checkbox"
-          checked={rememberMe}
-          onChange={(e) => {
-            setRememberMe(e.currentTarget.checked);
-          }}
-        />
-        <label className="cru-operation-dialog-inline-label">
-          {t("user.rememberMe")}
-        </label>
-      </div>
-      {error ? <p className="cru-color-danger">{t(error)}</p> : null}
-      <div className="cru-text-end">
-        <LoadingButton
-          loading={process}
-          onClick={(e) => {
-            submit();
-            e.preventDefault();
-          }}
-          disabled={username === "" || password === "" ? true : undefined}
-        >
-          {t("user.login")}
-        </LoadingButton>
-      </div>
-      <Trans i18nKey="login.noAccount">
-        0<Link to="/register">1</Link>2
-      </Trans>
-    </div>
-  );
-};
-
-export default LoginPage;
diff --git a/FrontEnd/src/views/register/index.css b/FrontEnd/src/views/register/index.css
deleted file mode 100644
index c0078b28..00000000
--- a/FrontEnd/src/views/register/index.css
+++ /dev/null
@@ -1,5 +0,0 @@
-.register-page {
-  display: flex;
-  flex-direction: column;
-  align-items: center;
-}
diff --git a/FrontEnd/src/views/register/index.tsx b/FrontEnd/src/views/register/index.tsx
deleted file mode 100644
index c1b95ff7..00000000
--- a/FrontEnd/src/views/register/index.tsx
+++ /dev/null
@@ -1,140 +0,0 @@
-import * as React from "react";
-import { useTranslation } from "react-i18next";
-import { useNavigate } from "react-router-dom";
-
-import { HttpBadRequestError } from "@/http/common";
-import { getHttpTokenClient } from "@/http/token";
-import { userService, useUser } from "@/services/user";
-
-import { LoadingButton } from "../common/button";
-import InputPanel, {
-  hasError,
-  InputPanelError,
-} from "../common/input/InputPanel";
-
-import "./index.css";
-
-const validate = (values: string[], dirties: boolean[]): InputPanelError => {
-  const e: InputPanelError = {};
-  if (dirties[0] && values[0].length === 0) {
-    e[0] = "register.error.usernameEmpty";
-  }
-  if (dirties[1] && values[1].length === 0) {
-    e[1] = "register.error.passwordEmpty";
-  }
-  if (dirties[2] && values[2] !== values[1]) {
-    e[2] = "register.error.confirmPasswordWrong";
-  }
-  if (dirties[3] && values[3].length === 0) {
-    e[3] = "register.error.registerCodeEmpty";
-  }
-  return e;
-};
-
-const RegisterPage: React.FC = () => {
-  const navigate = useNavigate();
-
-  const { t } = useTranslation();
-
-  const [username, setUsername] = React.useState<string>("");
-  const [password, setPassword] = React.useState<string>("");
-  const [confirmPassword, setConfirmPassword] = React.useState<string>("");
-  const [registerCode, setRegisterCode] = React.useState<string>("");
-
-  const [dirty, setDirty] = React.useState<boolean[]>(new Array(4).fill(false));
-
-  const [process, setProcess] = React.useState<boolean>(false);
-
-  const [inputError, setInputError] = React.useState<InputPanelError>();
-  const [resultError, setResultError] = React.useState<string | null>(null);
-
-  const user = useUser();
-
-  React.useEffect(() => {
-    if (user != null) {
-      navigate("/");
-    }
-  });
-
-  return (
-    <div className="container register-page">
-      <InputPanel
-        scheme={[
-          {
-            type: "text",
-            label: "register.username",
-          },
-          {
-            type: "text",
-            label: "register.password",
-            password: true,
-          },
-          {
-            type: "text",
-            label: "register.confirmPassword",
-            password: true,
-          },
-          { type: "text", label: "register.registerCode" },
-        ]}
-        values={[username, password, confirmPassword, registerCode]}
-        onChange={(values, index) => {
-          setUsername(values[0]);
-          setPassword(values[1]);
-          setConfirmPassword(values[2]);
-          setRegisterCode(values[3]);
-          const newDirty = dirty.slice();
-          newDirty[index] = true;
-          setDirty(newDirty);
-
-          setInputError(validate(values, newDirty));
-        }}
-        error={inputError}
-        disable={process}
-      />
-      {resultError && <div className="cru-color-danger">{t(resultError)}</div>}
-      <LoadingButton
-        text="register.register"
-        loading={process}
-        disabled={hasError(inputError)}
-        onClick={() => {
-          const newDirty = dirty.slice().fill(true);
-          setDirty(newDirty);
-          const e = validate(
-            [username, password, confirmPassword, registerCode],
-            newDirty
-          );
-          if (hasError(e)) {
-            setInputError(e);
-          } else {
-            setProcess(true);
-            void getHttpTokenClient()
-              .register({
-                username,
-                password,
-                registerCode,
-              })
-              .then(
-                () => {
-                  void userService
-                    .login({ username, password }, true)
-                    .then(() => {
-                      navigate("/");
-                    });
-                },
-                (error) => {
-                  if (error instanceof HttpBadRequestError) {
-                    setResultError("register.error.registerCodeInvalid");
-                  } else {
-                    setResultError("error.network");
-                  }
-                  setProcess(false);
-                }
-              );
-          }
-        }}
-      />
-    </div>
-  );
-};
-
-export default RegisterPage;
diff --git a/FrontEnd/src/views/search/index.css b/FrontEnd/src/views/search/index.css
deleted file mode 100644
index 6ff4d9fa..00000000
--- a/FrontEnd/src/views/search/index.css
+++ /dev/null
@@ -1,15 +0,0 @@
-.timeline-search-result-item {

-  border: 1px solid;

-  border-color: #e9ecef;

-  background: #f8f9fa;

-  transition: all 0.3s;

-}

-.timeline-search-result-item:hover {

-  border-color: #0d6efd;

-}

-

-.timeline-search-result-item-avatar {

-  width: 2em;

-  height: 2em;

-  border-radius: 50%;

-}

diff --git a/FrontEnd/src/views/search/index.tsx b/FrontEnd/src/views/search/index.tsx
deleted file mode 100644
index 58257465..00000000
--- a/FrontEnd/src/views/search/index.tsx
+++ /dev/null
@@ -1,131 +0,0 @@
-import * as React from "react";
-import { useTranslation } from "react-i18next";
-import { useNavigate, useLocation } from "react-router-dom";
-import { Link } from "react-router-dom";
-
-import { HttpNetworkError } from "@/http/common";
-import { getHttpSearchClient } from "@/http/search";
-import { HttpTimelineInfo } from "@/http/timeline";
-
-import SearchInput from "../common/SearchInput";
-import UserAvatar from "../common/user/UserAvatar";
-
-import "./index.css";
-
-const TimelineSearchResultItemView: React.FC<{
-  timeline: HttpTimelineInfo;
-}> = ({ timeline }) => {
-  return (
-    <div className="timeline-search-result-item my-2 p-3">
-      <h4>
-        <Link
-          to={`/${timeline.owner.username}/${timeline.nameV2}`}
-          className="mb-2 text-primary"
-        >
-          {timeline.title}
-          <small className="ms-3 text-secondary">{timeline.nameV2}</small>
-        </Link>
-      </h4>
-      <div>
-        <UserAvatar
-          username={timeline.owner.username}
-          className="timeline-search-result-item-avatar me-2"
-        />
-        {timeline.owner.nickname}
-        <small className="ms-3 text-secondary">
-          @{timeline.owner.username}
-        </small>
-      </div>
-    </div>
-  );
-};
-
-const SearchPage: React.FC = () => {
-  const { t } = useTranslation();
-
-  const navigate = useNavigate();
-  const location = useLocation();
-  const searchParams = new URLSearchParams(location.search);
-  const queryParam = searchParams.get("q");
-
-  const [searchText, setSearchText] = React.useState<string>("");
-  const [state, setState] = React.useState<
-    HttpTimelineInfo[] | "init" | "loading" | "network-error" | "error"
-  >("init");
-
-  const [forceResearchKey, setForceResearchKey] = React.useState<number>(0);
-
-  React.useEffect(() => {
-    setState("init");
-    if (queryParam != null && queryParam.length > 0) {
-      setSearchText(queryParam);
-      setState("loading");
-      void getHttpSearchClient()
-        .searchTimelines(queryParam)
-        .then(
-          (ts) => {
-            setState(ts);
-          },
-          (e) => {
-            if (e instanceof HttpNetworkError) {
-              setState("network-error");
-            } else {
-              setState("error");
-            }
-          }
-        );
-    }
-  }, [queryParam, forceResearchKey]);
-
-  return (
-    <div className="container my-3">
-      <div className="row justify-content-center">
-        <SearchInput
-          className="col-12 col-sm-9 col-md-6"
-          value={searchText}
-          onChange={setSearchText}
-          loading={state === "loading"}
-          onButtonClick={() => {
-            if (queryParam === searchText) {
-              setForceResearchKey((old) => old + 1);
-            } else {
-              navigate(`/search?q=${searchText}`);
-            }
-          }}
-        />
-      </div>
-      {(() => {
-        switch (state) {
-          case "init": {
-            if (queryParam == null || queryParam.length === 0) {
-              return <div>{t("searchPage.input")}</div>;
-            }
-            break;
-          }
-          case "loading": {
-            return <div>{t("searchPage.loading")}</div>;
-          }
-          case "network-error": {
-            return <div className="text-danger">{t("error.network")}</div>;
-          }
-          case "error": {
-            return <div className="text-danger">{t("error.unknown")}</div>;
-          }
-          default: {
-            if (state.length === 0) {
-              return <div>{t("searchPage.noResult")}</div>;
-            }
-            return state.map((t) => (
-              <TimelineSearchResultItemView
-                key={`${t.owner.username}/${t.nameV2}`}
-                timeline={t}
-              />
-            ));
-          }
-        }
-      })()}
-    </div>
-  );
-};
-
-export default SearchPage;
diff --git a/FrontEnd/src/views/settings/ChangeAvatarDialog.tsx b/FrontEnd/src/views/settings/ChangeAvatarDialog.tsx
deleted file mode 100644
index 44bd2c68..00000000
--- a/FrontEnd/src/views/settings/ChangeAvatarDialog.tsx
+++ /dev/null
@@ -1,354 +0,0 @@
-import { useState, useEffect } from "react";
-import * as React from "react";
-import { useTranslation } from "react-i18next";
-import { AxiosError } from "axios";
-
-import { convertI18nText, I18nText, UiLogicError } from "@/common";
-
-import { useUser } from "@/services/user";
-
-import { getHttpUserClient } from "@/http/user";
-
-import ImageCropper, { Clip, applyClipToImage } from "../common/ImageCropper";
-import Button from "../common/button/Button";
-import Dialog from "../common/dialog/Dialog";
-
-export interface ChangeAvatarDialogProps {
-  open: boolean;
-  close: () => void;
-}
-
-const ChangeAvatarDialog: React.FC<ChangeAvatarDialogProps> = (props) => {
-  const { t } = useTranslation();
-
-  const user = useUser();
-
-  const [file, setFile] = React.useState<File | null>(null);
-  const [fileUrl, setFileUrl] = React.useState<string | null>(null);
-  const [clip, setClip] = React.useState<Clip | null>(null);
-  const [cropImgElement, setCropImgElement] =
-    React.useState<HTMLImageElement | null>(null);
-  const [resultBlob, setResultBlob] = React.useState<Blob | null>(null);
-  const [resultUrl, setResultUrl] = React.useState<string | null>(null);
-
-  const [state, setState] = React.useState<
-    | "select"
-    | "crop"
-    | "processcrop"
-    | "preview"
-    | "uploading"
-    | "success"
-    | "error"
-  >("select");
-
-  const [message, setMessage] = useState<I18nText>(
-    "settings.dialogChangeAvatar.prompt.select"
-  );
-
-  const trueMessage = convertI18nText(message, t);
-
-  const closeDialog = props.close;
-
-  const close = React.useCallback((): void => {
-    if (!(state === "uploading")) {
-      closeDialog();
-    }
-  }, [state, closeDialog]);
-
-  useEffect(() => {
-    if (file != null) {
-      const url = URL.createObjectURL(file);
-      setClip(null);
-      setFileUrl(url);
-      setState("crop");
-      return () => {
-        URL.revokeObjectURL(url);
-      };
-    } else {
-      setFileUrl(null);
-      setState("select");
-    }
-  }, [file]);
-
-  React.useEffect(() => {
-    if (resultBlob != null) {
-      const url = URL.createObjectURL(resultBlob);
-      setResultUrl(url);
-      setState("preview");
-      return () => {
-        URL.revokeObjectURL(url);
-      };
-    } else {
-      setResultUrl(null);
-    }
-  }, [resultBlob]);
-
-  const onSelectFile = React.useCallback(
-    (e: React.ChangeEvent<HTMLInputElement>): void => {
-      const files = e.target.files;
-      if (files == null || files.length === 0) {
-        setFile(null);
-      } else {
-        setFile(files[0]);
-      }
-    },
-    []
-  );
-
-  const onCropNext = React.useCallback(() => {
-    if (
-      cropImgElement == null ||
-      clip == null ||
-      clip.width === 0 ||
-      file == null
-    ) {
-      throw new UiLogicError();
-    }
-
-    setState("processcrop");
-    void applyClipToImage(cropImgElement, clip, file.type).then((b) => {
-      setResultBlob(b);
-    });
-  }, [cropImgElement, clip, file]);
-
-  const onCropPrevious = React.useCallback(() => {
-    setFile(null);
-    setState("select");
-  }, []);
-
-  const onPreviewPrevious = React.useCallback(() => {
-    setResultBlob(null);
-    setState("crop");
-  }, []);
-
-  const upload = React.useCallback(() => {
-    if (resultBlob == null) {
-      throw new UiLogicError();
-    }
-
-    if (user == null) {
-      throw new UiLogicError();
-    }
-
-    setState("uploading");
-    getHttpUserClient()
-      .putAvatar(user.username, resultBlob)
-      .then(
-        () => {
-          setState("success");
-        },
-        (e: unknown) => {
-          setState("error");
-          setMessage({ type: "custom", value: (e as AxiosError).message });
-        }
-      );
-  }, [user, resultBlob]);
-
-  const createPreviewRow = (): React.ReactElement => {
-    if (resultUrl == null) {
-      throw new UiLogicError();
-    }
-    return (
-      <div className="row justify-content-center">
-        <div className="col col-auto">
-          <img
-            className="change-avatar-img"
-            src={resultUrl}
-            alt={t("settings.dialogChangeAvatar.previewImgAlt") ?? undefined}
-          />
-        </div>
-      </div>
-    );
-  };
-
-  return (
-    <Dialog open={props.open} onClose={close}>
-      <h3 className="cru-color-primary">
-        {t("settings.dialogChangeAvatar.title")}
-      </h3>
-      <hr />
-      {(() => {
-        if (state === "select") {
-          return (
-            <>
-              <div className="container">
-                <div className="row">
-                  {t("settings.dialogChangeAvatar.prompt.select")}
-                </div>
-                <div className="row">
-                  <input
-                    className="px-0"
-                    type="file"
-                    accept="image/*"
-                    onChange={onSelectFile}
-                  />
-                </div>
-              </div>
-              <hr />
-              <div className="cru-dialog-bottom-area">
-                <Button
-                  text="operationDialog.cancel"
-                  color="secondary"
-                  onClick={close}
-                />
-              </div>
-            </>
-          );
-        } else if (state === "crop") {
-          if (fileUrl == null) {
-            throw new UiLogicError();
-          }
-          return (
-            <>
-              <div className="container">
-                <div className="row justify-content-center">
-                  <ImageCropper
-                    clip={clip}
-                    onChange={setClip}
-                    imageUrl={fileUrl}
-                    imageElementCallback={setCropImgElement}
-                  />
-                </div>
-                <div className="row">
-                  {t("settings.dialogChangeAvatar.prompt.crop")}
-                </div>
-              </div>
-              <hr />
-              <div className="cru-dialog-bottom-area">
-                <Button
-                  text="operationDialog.cancel"
-                  color="secondary"
-                  outline
-                  onClick={close}
-                />
-                <Button
-                  text="operationDialog.previousStep"
-                  color="secondary"
-                  outline
-                  onClick={onCropPrevious}
-                />
-                <Button
-                  text="operationDialog.nextStep"
-                  color="primary"
-                  onClick={onCropNext}
-                  disabled={
-                    cropImgElement == null || clip == null || clip.width === 0
-                  }
-                />
-              </div>
-            </>
-          );
-        } else if (state === "processcrop") {
-          return (
-            <>
-              <div className="container">
-                <div className="row">
-                  {t("settings.dialogChangeAvatar.prompt.processingCrop")}
-                </div>
-              </div>
-              <hr />
-              <div className="cru-dialog-bottom-area">
-                <Button
-                  text="operationDialog.cancel"
-                  color="secondary"
-                  onClick={close}
-                  outline
-                />
-                <Button
-                  text="operationDialog.previousStep"
-                  color="secondary"
-                  onClick={onPreviewPrevious}
-                  outline
-                />
-              </div>
-            </>
-          );
-        } else if (state === "preview") {
-          return (
-            <>
-              <div className="container">
-                {createPreviewRow()}
-                <div className="row">
-                  {t("settings.dialogChangeAvatar.prompt.preview")}
-                </div>
-              </div>
-              <hr />
-              <div className="cru-dialog-bottom-area">
-                <Button
-                  text="operationDialog.cancel"
-                  color="secondary"
-                  outline
-                  onClick={close}
-                />
-                <Button
-                  text="operationDialog.previousStep"
-                  color="secondary"
-                  outline
-                  onClick={onPreviewPrevious}
-                />
-                <Button
-                  text="settings.dialogChangeAvatar.upload"
-                  color="primary"
-                  onClick={upload}
-                />
-              </div>
-            </>
-          );
-        } else if (state === "uploading") {
-          return (
-            <>
-              <div className="container">
-                {createPreviewRow()}
-                <div className="row">
-                  {t("settings.dialogChangeAvatar.prompt.uploading")}
-                </div>
-              </div>
-            </>
-          );
-        } else if (state === "success") {
-          return (
-            <>
-              <div className="container">
-                <div className="row p-4 text-success">
-                  {t("operationDialog.success")}
-                </div>
-              </div>
-              <hr />
-              <div className="cru-dialog-bottom-area">
-                <Button
-                  text="operationDialog.ok"
-                  color="success"
-                  onClick={close}
-                />
-              </div>
-            </>
-          );
-        } else {
-          return (
-            <>
-              <div className="container">
-                {createPreviewRow()}
-                <div className="row text-danger">{trueMessage}</div>
-              </div>
-              <hr />
-              <div>
-                <Button
-                  text="operationDialog.cancel"
-                  color="secondary"
-                  onClick={close}
-                />
-                <Button
-                  text="operationDialog.retry"
-                  color="primary"
-                  onClick={upload}
-                />
-              </div>
-            </>
-          );
-        }
-      })()}
-    </Dialog>
-  );
-};
-
-export default ChangeAvatarDialog;
diff --git a/FrontEnd/src/views/settings/ChangeNicknameDialog.tsx b/FrontEnd/src/views/settings/ChangeNicknameDialog.tsx
deleted file mode 100644
index 7ba12de8..00000000
--- a/FrontEnd/src/views/settings/ChangeNicknameDialog.tsx
+++ /dev/null
@@ -1,34 +0,0 @@
-import { getHttpUserClient } from "@/http/user";
-import { useUser } from "@/services/user";
-import * as React from "react";
-
-import OperationDialog from "../common/dialog/OperationDialog";
-
-export interface ChangeNicknameDialogProps {
-  open: boolean;
-  close: () => void;
-}
-
-const ChangeNicknameDialog: React.FC<ChangeNicknameDialogProps> = (props) => {
-  const user = useUser();
-
-  if (user == null) return null;
-
-  return (
-    <OperationDialog
-      open={props.open}
-      title="settings.dialogChangeNickname.title"
-      inputScheme={[
-        { type: "text", label: "settings.dialogChangeNickname.inputLabel" },
-      ]}
-      onProcess={([newNickname]) => {
-        return getHttpUserClient().patch(user.username, {
-          nickname: newNickname,
-        });
-      }}
-      onClose={props.close}
-    />
-  );
-};
-
-export default ChangeNicknameDialog;
diff --git a/FrontEnd/src/views/settings/ChangePasswordDialog.tsx b/FrontEnd/src/views/settings/ChangePasswordDialog.tsx
deleted file mode 100644
index a34ca4a7..00000000
--- a/FrontEnd/src/views/settings/ChangePasswordDialog.tsx
+++ /dev/null
@@ -1,69 +0,0 @@
-import { useState } from "react";
-import * as React from "react";
-import { useNavigate } from "react-router-dom";
-
-import { userService } from "@/services/user";
-
-import OperationDialog from "../common/dialog/OperationDialog";
-
-export interface ChangePasswordDialogProps {
-  open: boolean;
-  close: () => void;
-}
-
-const ChangePasswordDialog: React.FC<ChangePasswordDialogProps> = (props) => {
-  const navigate = useNavigate();
-
-  const [redirect, setRedirect] = useState<boolean>(false);
-
-  return (
-    <OperationDialog
-      open={props.open}
-      title="settings.dialogChangePassword.title"
-      themeColor="danger"
-      inputPrompt="settings.dialogChangePassword.prompt"
-      inputScheme={[
-        {
-          type: "text",
-          label: "settings.dialogChangePassword.inputOldPassword",
-          password: true,
-        },
-        {
-          type: "text",
-          label: "settings.dialogChangePassword.inputNewPassword",
-          password: true,
-        },
-        {
-          type: "text",
-          label: "settings.dialogChangePassword.inputRetypeNewPassword",
-          password: true,
-        },
-      ]}
-      inputValidator={([oldPassword, newPassword, retypedNewPassword]) => {
-        const result: Record<number, string> = {};
-        if (oldPassword === "") {
-          result[0] = "settings.dialogChangePassword.errorEmptyOldPassword";
-        }
-        if (newPassword === "") {
-          result[1] = "settings.dialogChangePassword.errorEmptyNewPassword";
-        }
-        if (retypedNewPassword !== newPassword) {
-          result[2] = "settings.dialogChangePassword.errorRetypeNotMatch";
-        }
-        return result;
-      }}
-      onProcess={async ([oldPassword, newPassword]) => {
-        await userService.changePassword(oldPassword, newPassword);
-        setRedirect(true);
-      }}
-      onClose={() => {
-        props.close();
-        if (redirect) {
-          navigate("/login");
-        }
-      }}
-    />
-  );
-};
-
-export default ChangePasswordDialog;
diff --git a/FrontEnd/src/views/settings/index.css b/FrontEnd/src/views/settings/index.css
deleted file mode 100644
index ccf7a97a..00000000
--- a/FrontEnd/src/views/settings/index.css
+++ /dev/null
@@ -1,31 +0,0 @@
-.change-avatar-cropper-row {

-  max-height: 400px;

-}

-

-.change-avatar-img {

-  min-width: 50%;

-  max-width: 100%;

-  max-height: 400px;

-}

-

-.settings-item {

-  padding: 0.5em 1em;

-  transition: background 0.3s;

-  border-bottom: 1px solid #e9ecef;

-  align-items: center;

-}

-.settings-item.first {

-  border-top: 1px solid #e9ecef;

-}

-.settings-item.clickable {

-  cursor: pointer;

-}

-.settings-item:hover {

-  background: #dee2e6;

-}

-

-.register-code {

-  border: 1px solid black;

-  border-radius: 3px;

-  padding: 0.2em;

-}
\ No newline at end of file
diff --git a/FrontEnd/src/views/settings/index.tsx b/FrontEnd/src/views/settings/index.tsx
deleted file mode 100644
index 6647826f..00000000
--- a/FrontEnd/src/views/settings/index.tsx
+++ /dev/null
@@ -1,338 +0,0 @@
-import { useState } from "react";
-import * as React from "react";
-import { useNavigate } from "react-router-dom";
-import { useTranslation } from "react-i18next";
-import classNames from "classnames";
-
-import { convertI18nText, I18nText, UiLogicError } from "@/common";
-import { useUser, userService } from "@/services/user";
-import { getHttpUserClient } from "@/http/user";
-import { TimelineVisibility } from "@/http/timeline";
-
-import ConfirmDialog from "../common/dialog/ConfirmDialog";
-import Card from "../common/Card";
-import Spinner from "../common/Spinner";
-import ChangePasswordDialog from "./ChangePasswordDialog";
-import ChangeAvatarDialog from "./ChangeAvatarDialog";
-import ChangeNicknameDialog from "./ChangeNicknameDialog";
-
-import "./index.css";
-import { pushAlert } from "@/services/alert";
-
-interface SettingSectionProps {
-  title: I18nText;
-  children: React.ReactNode;
-}
-
-const SettingSection: React.FC<SettingSectionProps> = ({ title, children }) => {
-  const { t } = useTranslation();
-
-  return (
-    <Card className="my-3 py-3">
-      <h3 className="px-3 mb-3 cru-color-primary">
-        {convertI18nText(title, t)}
-      </h3>
-      {children}
-    </Card>
-  );
-};
-
-interface SettingItemContainerWithoutChildrenProps {
-  title: I18nText;
-  subtext?: I18nText;
-  first?: boolean;
-  danger?: boolean;
-  style?: React.CSSProperties;
-  className?: string;
-  onClick?: () => void;
-}
-
-interface SettingItemContainerProps
-  extends SettingItemContainerWithoutChildrenProps {
-  children?: React.ReactNode;
-}
-
-function SettingItemContainer({
-  title,
-  subtext,
-  first,
-  danger,
-  children,
-  style,
-  className,
-  onClick,
-}: SettingItemContainerProps): JSX.Element {
-  const { t } = useTranslation();
-
-  return (
-    <div
-      style={style}
-      className={classNames(
-        "row settings-item mx-0",
-        first && "first",
-        onClick && "clickable",
-        className,
-      )}
-      onClick={onClick}
-    >
-      <div className="px-0 col col-auto">
-        <div className={classNames(danger && "cru-color-danger")}>
-          {convertI18nText(title, t)}
-        </div>
-        <small className="d-block cru-color-secondary">
-          {convertI18nText(subtext, t)}
-        </small>
-      </div>
-      <div className="col col-auto">{children}</div>
-    </div>
-  );
-}
-
-type ButtonSettingItemProps = SettingItemContainerWithoutChildrenProps;
-
-const ButtonSettingItem: React.FC<ButtonSettingItemProps> = ({ ...props }) => {
-  return <SettingItemContainer {...props} />;
-};
-
-interface SelectSettingItemProps
-  extends SettingItemContainerWithoutChildrenProps {
-  options: {
-    value: string;
-    label: I18nText;
-  }[];
-  value?: string;
-  onSelect: (value: string) => void;
-}
-
-const SelectSettingsItem: React.FC<SelectSettingItemProps> = ({
-  options,
-  value,
-  onSelect,
-  ...props
-}) => {
-  const { t } = useTranslation();
-
-  return (
-    <SettingItemContainer {...props}>
-      {value == null ? (
-        <Spinner />
-      ) : (
-        <select
-          value={value}
-          onChange={(e) => {
-            onSelect(e.target.value);
-          }}
-        >
-          {options.map(({ value, label }) => (
-            <option key={value} value={value}>
-              {convertI18nText(label, t)}
-            </option>
-          ))}
-        </select>
-      )}
-    </SettingItemContainer>
-  );
-};
-
-const SettingsPage: React.FC = () => {
-  const { i18n } = useTranslation();
-  const user = useUser();
-  const navigate = useNavigate();
-
-  const [dialog, setDialog] = useState<
-    | null
-    | "changepassword"
-    | "changeavatar"
-    | "changenickname"
-    | "logout"
-    | "renewregistercode"
-  >(null);
-
-  const [registerCode, setRegisterCode] = useState<undefined | null | string>(
-    undefined,
-  );
-
-  const [bookmarkVisibility, setBookmarkVisibility] =
-    useState<TimelineVisibility>();
-
-  React.useEffect(() => {
-    if (user != null) {
-      void getHttpUserClient()
-        .getBookmarkVisibility(user.username)
-        .then(({ visibility }) => {
-          setBookmarkVisibility(visibility);
-        });
-    } else {
-      setBookmarkVisibility(undefined);
-    }
-  }, [user]);
-
-  React.useEffect(() => {
-    setRegisterCode(undefined);
-  }, [user]);
-
-  React.useEffect(() => {
-    if (user != null && registerCode === undefined) {
-      void getHttpUserClient()
-        .getRegisterCode(user.username)
-        .then((code) => {
-          setRegisterCode(code.registerCode ?? null);
-        });
-    }
-  }, [user, registerCode]);
-
-  const language = i18n.language.slice(0, 2);
-
-  return (
-    <>
-      <div className="container">
-        {user ? (
-          <SettingSection title="settings.subheaders.account">
-            <SettingItemContainer
-              title="settings.myRegisterCode"
-              subtext="settings.myRegisterCodeDesc"
-              onClick={() => setDialog("renewregistercode")}
-            >
-              {registerCode === undefined ? (
-                <Spinner />
-              ) : registerCode === null ? (
-                <span>Noop</span>
-              ) : (
-                <code
-                  className="register-code"
-                  onClick={(event) => {
-                    void navigator.clipboard
-                      .writeText(registerCode)
-                      .then(() => {
-                        pushAlert({
-                          type: "success",
-                          message: "settings.myRegisterCodeCopied",
-                        });
-                      });
-                    event.stopPropagation();
-                  }}
-                >
-                  {registerCode}
-                </code>
-              )}
-            </SettingItemContainer>
-            <ButtonSettingItem
-              title="settings.changeAvatar"
-              onClick={() => setDialog("changeavatar")}
-              first
-            />
-            <ButtonSettingItem
-              title="settings.changeNickname"
-              onClick={() => setDialog("changenickname")}
-            />
-            <SelectSettingsItem
-              title="settings.changeBookmarkVisibility"
-              options={[
-                {
-                  value: "Private",
-                  label: "visibility.private",
-                },
-                {
-                  value: "Register",
-                  label: "visibility.register",
-                },
-                {
-                  value: "Public",
-                  label: "visibility.public",
-                },
-              ]}
-              value={bookmarkVisibility}
-              onSelect={(value) => {
-                void getHttpUserClient()
-                  .putBookmarkVisibility(user.username, {
-                    visibility: value as TimelineVisibility,
-                  })
-                  .then(() => {
-                    setBookmarkVisibility(value as TimelineVisibility);
-                  });
-              }}
-            />
-            <ButtonSettingItem
-              title="settings.changePassword"
-              onClick={() => setDialog("changepassword")}
-              danger
-            />
-            <ButtonSettingItem
-              title="settings.logout"
-              onClick={() => {
-                setDialog("logout");
-              }}
-              danger
-            />
-          </SettingSection>
-        ) : null}
-        <SettingSection title="settings.subheaders.customization">
-          <SelectSettingsItem
-            title="settings.languagePrimary"
-            subtext="settings.languageSecondary"
-            options={[
-              {
-                value: "zh",
-                label: {
-                  type: "custom",
-                  value: "中文",
-                },
-              },
-              {
-                value: "en",
-                label: {
-                  type: "custom",
-                  value: "English",
-                },
-              },
-            ]}
-            value={language}
-            onSelect={(value) => {
-              void i18n.changeLanguage(value);
-            }}
-            first
-          />
-        </SettingSection>
-      </div>
-      <ChangePasswordDialog
-        open={dialog === "changepassword"}
-        close={() => setDialog(null)}
-      />
-      <ConfirmDialog
-        title="settings.dialogConfirmLogout.title"
-        body="settings.dialogConfirmLogout.prompt"
-        onClose={() => setDialog(null)}
-        open={dialog === "logout"}
-        onConfirm={() => {
-          void userService.logout().then(() => {
-            navigate("/");
-          });
-        }}
-      />
-      <ConfirmDialog
-        title="settings.renewRegisterCode"
-        body="settings.renewRegisterCodeDesc"
-        onClose={() => setDialog(null)}
-        open={dialog === "renewregistercode"}
-        onConfirm={() => {
-          if (user == null) throw new UiLogicError();
-          void getHttpUserClient()
-            .renewRegisterCode(user.username)
-            .then(() => {
-              setRegisterCode(undefined);
-            });
-        }}
-      />
-      <ChangeAvatarDialog
-        open={dialog === "changeavatar"}
-        close={() => setDialog(null)}
-      />
-      <ChangeNicknameDialog
-        open={dialog === "changenickname"}
-        close={() => setDialog(null)}
-      />
-    </>
-  );
-};
-
-export default SettingsPage;
diff --git a/FrontEnd/src/views/timeline/CollapseButton.tsx b/FrontEnd/src/views/timeline/CollapseButton.tsx
deleted file mode 100644
index 374ccc2e..00000000
--- a/FrontEnd/src/views/timeline/CollapseButton.tsx
+++ /dev/null
@@ -1,21 +0,0 @@
-import * as React from "react";
-
-import IconButton from "../common/button/IconButton";
-
-const CollapseButton: React.FC<{
-  collapse: boolean;
-  onClick: () => void;
-  className?: string;
-  style?: React.CSSProperties;
-}> = ({ collapse, onClick, className, style }) => {
-  return (
-    <IconButton
-      icon={collapse ? "arrows-angle-expand" : "arrows-angle-contract"}
-      onClick={onClick}
-      className={className}
-      style={style}
-    />
-  );
-};
-
-export default CollapseButton;
diff --git a/FrontEnd/src/views/timeline/ConnectionStatusBadge.css b/FrontEnd/src/views/timeline/ConnectionStatusBadge.css
deleted file mode 100644
index 7fe83b9b..00000000
--- a/FrontEnd/src/views/timeline/ConnectionStatusBadge.css
+++ /dev/null
@@ -1,36 +0,0 @@
-.connection-status-badge {

-  font-size: 0.8em;

-  border-radius: 5px;

-  padding: 0.1em 1em;

-  background-color: #eaf2ff;

-}

-.connection-status-badge::before {

-  width: 10px;

-  height: 10px;

-  border-radius: 50%;

-  display: inline-block;

-  content: "";

-  margin-right: 0.6em;

-}

-.connection-status-badge.success {

-  color: #006100;

-}

-.connection-status-badge.success::before {

-  background-color: #006100;

-}

-

-.connection-status-badge.warning {

-  color: #e4a700;

-}

-

-.connection-status-badge.warning::before {

-  background-color: #e4a700;

-}

-

-.connection-status-badge.danger {

-  color: #fd1616;

-}

-

-.connection-status-badge.danger::before {

-  background-color: #fd1616;

-}

diff --git a/FrontEnd/src/views/timeline/ConnectionStatusBadge.tsx b/FrontEnd/src/views/timeline/ConnectionStatusBadge.tsx
deleted file mode 100644
index 2b820454..00000000
--- a/FrontEnd/src/views/timeline/ConnectionStatusBadge.tsx
+++ /dev/null
@@ -1,41 +0,0 @@
-import * as React from "react";
-import classnames from "classnames";
-import { HubConnectionState } from "@microsoft/signalr";
-import { useTranslation } from "react-i18next";
-
-import "./ConnectionStatusBadge.css";
-
-export interface ConnectionStatusBadgeProps {
-  status: HubConnectionState;
-  className?: string;
-  style?: React.CSSProperties;
-}
-
-const classNameMap: Record<HubConnectionState, string> = {
-  Connected: "success",
-  Connecting: "warning",
-  Disconnected: "danger",
-  Disconnecting: "warning",
-  Reconnecting: "warning",
-};
-
-const ConnectionStatusBadge: React.FC<ConnectionStatusBadgeProps> = (props) => {
-  const { status, className, style } = props;
-
-  const { t } = useTranslation();
-
-  return (
-    <div
-      className={classnames(
-        "connection-status-badge",
-        classNameMap[status],
-        className
-      )}
-      style={style}
-    >
-      {t(`connectionState.${status}`)}
-    </div>
-  );
-};
-
-export default ConnectionStatusBadge;
diff --git a/FrontEnd/src/views/timeline/MarkdownPostEdit.css b/FrontEnd/src/views/timeline/MarkdownPostEdit.css
deleted file mode 100644
index e36be992..00000000
--- a/FrontEnd/src/views/timeline/MarkdownPostEdit.css
+++ /dev/null
@@ -1,21 +0,0 @@
-.timeline-markdown-post-edit-page {

-  overflow: auto;

-  max-height: 300px;

-}

-

-.timeline-markdown-post-edit-image-container {

-  position: relative;

-  text-align: center;

-  margin-bottom: 1em;

-}

-

-.timeline-markdown-post-edit-image {

-  max-width: 100%;

-  max-height: 200px;

-}

-

-.timeline-markdown-post-edit-image-delete-button {

-  position: absolute;

-  right: 10px;

-  top: 2px;

-}

diff --git a/FrontEnd/src/views/timeline/MarkdownPostEdit.tsx b/FrontEnd/src/views/timeline/MarkdownPostEdit.tsx
deleted file mode 100644
index 6401cfaa..00000000
--- a/FrontEnd/src/views/timeline/MarkdownPostEdit.tsx
+++ /dev/null
@@ -1,215 +0,0 @@
-import * as React from "react";
-import classnames from "classnames";
-import { useTranslation } from "react-i18next";
-
-import { getHttpTimelineClient, HttpTimelinePostInfo } from "@/http/timeline";
-
-import TimelinePostBuilder from "@/services/TimelinePostBuilder";
-
-import FlatButton from "../common/button/FlatButton";
-import TabPages from "../common/tab/TabPages";
-import ConfirmDialog from "../common/dialog/ConfirmDialog";
-import Spinner from "../common/Spinner";
-import IconButton from "../common/button/IconButton";
-
-import "./MarkdownPostEdit.css";
-
-export interface MarkdownPostEditProps {
-  owner: string;
-  timeline: string;
-  onPosted: (post: HttpTimelinePostInfo) => void;
-  onPostError: () => void;
-  onClose: () => void;
-  className?: string;
-  style?: React.CSSProperties;
-}
-
-const MarkdownPostEdit: React.FC<MarkdownPostEditProps> = ({
-  owner: ownerUsername,
-  timeline: timelineName,
-  onPosted,
-  onClose,
-  onPostError,
-  className,
-  style,
-}) => {
-  const { t } = useTranslation();
-
-  const [canLeave, setCanLeave] = React.useState<boolean>(true);
-
-  const [process, setProcess] = React.useState<boolean>(false);
-
-  const [showLeaveConfirmDialog, setShowLeaveConfirmDialog] =
-    React.useState<boolean>(false);
-
-  const [text, _setText] = React.useState<string>("");
-  const [images, _setImages] = React.useState<{ file: File; url: string }[]>(
-    []
-  );
-  const [previewHtml, _setPreviewHtml] = React.useState<string>("");
-
-  const _builder = React.useRef<TimelinePostBuilder | null>(null);
-
-  const getBuilder = (): TimelinePostBuilder => {
-    if (_builder.current == null) {
-      const builder = new TimelinePostBuilder(() => {
-        setCanLeave(builder.isEmpty);
-        _setText(builder.text);
-        _setImages(builder.images);
-        _setPreviewHtml(builder.renderHtml());
-      });
-      _builder.current = builder;
-    }
-    return _builder.current;
-  };
-
-  const canSend = text.length > 0;
-
-  React.useEffect(() => {
-    return () => {
-      getBuilder().dispose();
-    };
-  }, []);
-
-  React.useEffect(() => {
-    window.onbeforeunload = (): unknown => {
-      if (!canLeave) {
-        return t("timeline.confirmLeave");
-      }
-    };
-
-    return () => {
-      window.onbeforeunload = null;
-    };
-  }, [canLeave, t]);
-
-  const send = async (): Promise<void> => {
-    setProcess(true);
-    try {
-      const dataList = await getBuilder().build();
-      const post = await getHttpTimelineClient().postPost(
-        ownerUsername,
-        timelineName,
-        {
-          dataList,
-        }
-      );
-      onPosted(post);
-      onClose();
-    } catch (e) {
-      setProcess(false);
-      onPostError();
-    }
-  };
-
-  return (
-    <>
-      <TabPages
-        className={className}
-        style={style}
-        pageContainerClassName="py-2"
-        dense
-        actions={
-          process ? (
-            <Spinner />
-          ) : (
-            <div>
-              <IconButton
-                icon="x"
-                color="danger"
-                large
-                className="cru-align-middle me-2"
-                onClick={() => {
-                  if (canLeave) {
-                    onClose();
-                  } else {
-                    setShowLeaveConfirmDialog(true);
-                  }
-                }}
-              />
-              {canSend && (
-                <FlatButton text="timeline.send" onClick={() => void send()} />
-              )}
-            </div>
-          )
-        }
-        pages={[
-          {
-            name: "text",
-            text: "edit",
-            page: (
-              <textarea
-                value={text}
-                disabled={process}
-                className="cru-fill-parent"
-                onChange={(event) => {
-                  getBuilder().setMarkdownText(event.currentTarget.value);
-                }}
-              />
-            ),
-          },
-          {
-            name: "images",
-            text: "image",
-            page: (
-              <div className="timeline-markdown-post-edit-page">
-                {images.map((image, index) => (
-                  <div
-                    key={image.url}
-                    className="timeline-markdown-post-edit-image-container"
-                  >
-                    <img
-                      src={image.url}
-                      className="timeline-markdown-post-edit-image"
-                    />
-                    <IconButton
-                      icon="trash"
-                      color="danger"
-                      className={classnames(
-                        "timeline-markdown-post-edit-image-delete-button",
-                        process && "d-none"
-                      )}
-                      onClick={() => {
-                        getBuilder().deleteImage(index);
-                      }}
-                    />
-                  </div>
-                ))}
-                <input
-                  type="file"
-                  accept="image/jpeg,image/jpg,image/png,image/gif,image/webp"
-                  onChange={(event: React.ChangeEvent<HTMLInputElement>) => {
-                    const { files } = event.currentTarget;
-                    if (files != null && files.length !== 0) {
-                      getBuilder().appendImage(files[0]);
-                    }
-                  }}
-                  disabled={process}
-                />
-              </div>
-            ),
-          },
-          {
-            name: "preview",
-            text: "preview",
-            page: (
-              <div
-                className="markdown-container timeline-markdown-post-edit-page"
-                dangerouslySetInnerHTML={{ __html: previewHtml }}
-              />
-            ),
-          },
-        ]}
-      />
-      <ConfirmDialog
-        onClose={() => setShowLeaveConfirmDialog(false)}
-        onConfirm={onClose}
-        open={showLeaveConfirmDialog}
-        title="timeline.dropDraft"
-        body="timeline.confirmLeave"
-      />
-    </>
-  );
-};
-
-export default MarkdownPostEdit;
diff --git a/FrontEnd/src/views/timeline/PostPropertyChangeDialog.tsx b/FrontEnd/src/views/timeline/PostPropertyChangeDialog.tsx
deleted file mode 100644
index fc55185c..00000000
--- a/FrontEnd/src/views/timeline/PostPropertyChangeDialog.tsx
+++ /dev/null
@@ -1,42 +0,0 @@
-import * as React from "react";
-
-import { getHttpTimelineClient, HttpTimelinePostInfo } from "@/http/timeline";
-
-import OperationDialog from "../common/dialog/OperationDialog";
-
-function PostPropertyChangeDialog(props: {
-  open: boolean;
-  onClose: () => void;
-  post: HttpTimelinePostInfo;
-  onSuccess: (post: HttpTimelinePostInfo) => void;
-}): React.ReactElement | null {
-  const { open, onClose, post, onSuccess } = props;
-
-  return (
-    <OperationDialog
-      title="timeline.changePostPropertyDialog.title"
-      onClose={onClose}
-      open={open}
-      inputScheme={[
-        {
-          label: "timeline.changePostPropertyDialog.time",
-          type: "datetime",
-          initValue: post.time,
-        },
-      ]}
-      onProcess={([time]) => {
-        return getHttpTimelineClient().patchPost(
-          post.timelineOwnerV2,
-          post.timelineNameV2,
-          post.id,
-          {
-            time: time === "" ? undefined : new Date(time).toISOString(),
-          }
-        );
-      }}
-      onSuccessAndClose={onSuccess}
-    />
-  );
-}
-
-export default PostPropertyChangeDialog;
diff --git a/FrontEnd/src/views/timeline/Timeline.css b/FrontEnd/src/views/timeline/Timeline.css
deleted file mode 100644
index 4dd4fdcc..00000000
--- a/FrontEnd/src/views/timeline/Timeline.css
+++ /dev/null
@@ -1,244 +0,0 @@
-.timeline {
-  z-index: 0;
-  position: relative;
-  width: 100%;
-}
-
-@keyframes timeline-line-node {
-  to {
-    box-shadow: 0 0 20px 3px var(--cru-primary-l1-color);
-  }
-}
-
-@keyframes timeline-line-node-current {
-  to {
-    box-shadow: 0 0 20px 3px var(--cru-primary-enhance-l1-color);
-  }
-}
-
-@keyframes timeline-line-node-loading {
-  to {
-    box-shadow: 0 0 20px 3px var(--cru-primary-l1-color);
-  }
-}
-
-@keyframes timeline-line-node-loading-edge {
-  from {
-    transform: rotate(0turn);
-  }
-  to {
-    transform: rotate(1turn);
-  }
-}
-
-@keyframes timeline-top-loading-enter {
-  from {
-    transform: translate(0, -100%);
-  }
-}
-
-@keyframes timeline-post-enter {
-  from {
-    transform: translate(0, 100%);
-    opacity: 0;
-  }
-  to {
-    opacity: 1;
-  }
-}
-
-.timeline-top-loading-enter {
-  animation: 1s timeline-top-loading-enter;
-}
-
-.timeline-line {
-  display: flex;
-  flex-direction: column;
-  align-items: center;
-  width: 30px;
-  position: absolute;
-  z-index: 1;
-  left: 2em;
-  top: 0;
-  bottom: 0;
-  transition: left 0.5s;
-}
-
-@media (max-width: 575.98px) {
-  .timeline-line {
-    left: 1em;
-  }
-}
-
-.timeline-line .segment {
-  width: 7px;
-  background: var(--cru-primary-color);
-}
-.timeline-line .segment.start {
-  height: 1.8em;
-  flex: 0 0 auto;
-}
-.timeline-line .segment.end {
-  flex: 1 1 auto;
-}
-.timeline-line .segment.current-end {
-  height: 2em;
-  flex: 0 0 auto;
-  background: linear-gradient(var(--cru-primary-enhance-color), white);
-}
-.timeline-line .node-container {
-  flex: 0 0 auto;
-  position: relative;
-  width: 18px;
-  height: 18px;
-}
-.timeline-line .node {
-  width: 20px;
-  height: 20px;
-  position: absolute;
-  background: var(--cru-primary-color);
-  left: -1px;
-  top: -1px;
-  border-radius: 50%;
-  box-sizing: border-box;
-  z-index: 1;
-  animation: 1s infinite alternate;
-  animation-name: timeline-line-node;
-}
-.timeline-line .node-loading-edge {
-  color: var(--cru-primary-color);
-  width: 38px;
-  height: 38px;
-  position: absolute;
-  left: -10px;
-  top: -10px;
-  box-sizing: border-box;
-  z-index: 2;
-  animation: 1.5s linear infinite timeline-line-node-loading-edge;
-}
-.timeline-line.current .segment.start {
-  background: linear-gradient(
-    var(--cru-primary-color),
-    var(--cru-primary-enhance-color)
-  );
-}
-
-.timeline-line.current .segment.end {
-  background: var(--cru-primary-enhance-color);
-}
-
-.timeline-line.current .node {
-  background: var(--cru-primary-enhance-color);
-  animation-name: timeline-line-node-current;
-}
-
-.timeline-line.loading .node {
-  background: var(--cru-primary-color);
-  animation-name: timeline-line-node-loading;
-}
-
-.timeline-item {
-  position: relative;
-  padding: 0.5em;
-}
-
-.timeline-item-card {
-  position: relative;
-  padding: 0.5em 0.5em 0.5em 4em;
-}
-
-.timeline-item-card.enter-animation {
-  animation: 0.6s forwards;
-  opacity: 0;
-}
-
-@media (max-width: 575.98px) {
-  .timeline-item-card {
-    padding-left: 3em;
-  }
-}
-
-.timeline-item-header {
-  display: flex;
-  align-items: center;
-}
-
-.timeline-avatar {
-  border-radius: 50%;
-  width: 2em;
-  height: 2em;
-}
-
-.timeline-item-delete-button {
-  position: absolute;
-  right: 0;
-  bottom: 0;
-}
-
-.timeline-content {
-  white-space: pre-line;
-}
-
-.timeline-content-image {
-  max-width: 80%;
-  max-height: 200px;
-}
-
-.timeline-date-item {
-  position: relative;
-  padding: 0.3em 0 0.3em 4em;
-}
-
-.timeline-date-item-badge {
-  display: inline-block;
-  padding: 0.1em 0.4em;
-  border-radius: 0.4em;
-  background: #7c7c7c;
-  color: white;
-  font-size: 0.8em;
-}
-
-.timeline-post-item-options-mask {
-  background: rgba(255, 255, 255, 0.85);
-  z-index: 100;
-  position: absolute;
-  left: 0;
-  right: 0;
-  top: 0;
-  bottom: 0;
-
-  display: flex;
-  justify-content: space-around;
-  align-items: center;
-
-  border-radius: var(--cru-card-border-radius);
-}
-
-.timeline-sync-state-badge {
-  font-size: 0.8em;
-  padding: 3px 8px;
-  border-radius: 5px;
-  background: #e8fbff;
-}
-
-.timeline-sync-state-badge-pin {
-  display: inline-block;
-  width: 0.4em;
-  height: 0.4em;
-  border-radius: 50%;
-  vertical-align: middle;
-  margin-right: 0.6em;
-}
-
-.timeline-card {
-  position: fixed;
-  z-index: 1029;
-  top: 56px;
-  right: 0;
-  margin: 0.5em;
-}
-
-.timeline-top {
-  position: sticky;
-  top: 56px;
-}
diff --git a/FrontEnd/src/views/timeline/Timeline.tsx b/FrontEnd/src/views/timeline/Timeline.tsx
deleted file mode 100644
index 3a7fbd00..00000000
--- a/FrontEnd/src/views/timeline/Timeline.tsx
+++ /dev/null
@@ -1,207 +0,0 @@
-import * as React from "react";
-import classnames from "classnames";
-import { useScrollToBottom } from "@/utilities/hooks";
-import { HubConnectionState } from "@microsoft/signalr";
-
-import {
-  HttpForbiddenError,
-  HttpNetworkError,
-  HttpNotFoundError,
-} from "@/http/common";
-import {
-  getHttpTimelineClient,
-  HttpTimelineInfo,
-  HttpTimelinePostInfo,
-} from "@/http/timeline";
-
-import { useUser } from "@/services/user";
-import { getTimelinePostUpdate$ } from "@/services/timeline";
-
-import TimelinePostListView from "./TimelinePostListView";
-import TimelineEmptyItem from "./TimelineEmptyItem";
-import TimelineLoading from "./TimelineLoading";
-import TimelinePostEdit from "./TimelinePostEdit";
-import TimelinePostEditNoLogin from "./TimelinePostEditNoLogin";
-import TimelineCard from "./TimelineCard";
-
-import "./Timeline.css";
-
-export interface TimelineProps {
-  className?: string;
-  style?: React.CSSProperties;
-  timelineOwner: string;
-  timelineName: string;
-}
-
-const Timeline: React.FC<TimelineProps> = (props) => {
-  const { timelineOwner, timelineName, className, style } = props;
-
-  const user = useUser();
-
-  const [timeline, setTimeline] = React.useState<HttpTimelineInfo | null>(null);
-  const [posts, setPosts] = React.useState<HttpTimelinePostInfo[] | null>(null);
-  const [signalrState, setSignalrState] = React.useState<HubConnectionState>(
-    HubConnectionState.Connecting
-  );
-  const [error, setError] = React.useState<
-    "offline" | "forbid" | "notfound" | "error" | null
-  >(null);
-
-  const [currentPage, setCurrentPage] = React.useState(1);
-  const [totalPage, setTotalPage] = React.useState(0);
-
-  const [timelineReloadKey, setTimelineReloadKey] = React.useState(0);
-  const [postsReloadKey, setPostsReloadKey] = React.useState(0);
-
-  const updateTimeline = (): void => setTimelineReloadKey((o) => o + 1);
-  const updatePosts = (): void => setPostsReloadKey((o) => o + 1);
-
-  React.useEffect(() => {
-    setTimeline(null);
-    setPosts(null);
-    setError(null);
-    setSignalrState(HubConnectionState.Connecting);
-  }, [timelineOwner, timelineName]);
-
-  React.useEffect(() => {
-    getHttpTimelineClient()
-      .getTimeline(timelineOwner, timelineName)
-      .then(
-        (t) => {
-          setTimeline(t);
-        },
-        (error) => {
-          if (error instanceof HttpNetworkError) {
-            setError("offline");
-          } else if (error instanceof HttpForbiddenError) {
-            setError("forbid");
-          } else if (error instanceof HttpNotFoundError) {
-            setError("notfound");
-          } else {
-            console.error(error);
-            setError("error");
-          }
-        }
-      );
-  }, [timelineOwner, timelineName, timelineReloadKey]);
-
-  React.useEffect(() => {
-    getHttpTimelineClient()
-      .listPost(timelineOwner, timelineName, 1)
-      .then(
-        (page) => {
-          setPosts(
-            page.items.filter((p): p is HttpTimelinePostInfo => !p.deleted)
-          );
-          setTotalPage(page.totalPageCount);
-        },
-        (error) => {
-          if (error instanceof HttpNetworkError) {
-            setError("offline");
-          } else if (error instanceof HttpForbiddenError) {
-            setError("forbid");
-          } else if (error instanceof HttpNotFoundError) {
-            setError("notfound");
-          } else {
-            console.error(error);
-            setError("error");
-          }
-        }
-      );
-  }, [timelineOwner, timelineName, postsReloadKey]);
-
-  React.useEffect(() => {
-    const timelinePostUpdate$ = getTimelinePostUpdate$(
-      timelineOwner,
-      timelineName
-    );
-    const subscription = timelinePostUpdate$.subscribe(({ update, state }) => {
-      if (update) {
-        setPostsReloadKey((o) => o + 1);
-      }
-      setSignalrState(state);
-    });
-    return () => {
-      subscription.unsubscribe();
-    };
-  }, [timelineOwner, timelineName]);
-
-  useScrollToBottom(() => {
-    console.log(`Load page ${currentPage + 1}.`);
-    setCurrentPage(currentPage + 1);
-    void getHttpTimelineClient()
-      .listPost(timelineOwner, timelineName, currentPage + 1)
-      .then(
-        (page) => {
-          const ps = page.items.filter(
-            (p): p is HttpTimelinePostInfo => !p.deleted
-          );
-          setPosts((old) => [...(old ?? []), ...ps]);
-        },
-        (error) => {
-          if (error instanceof HttpNetworkError) {
-            setError("offline");
-          } else if (error instanceof HttpForbiddenError) {
-            setError("forbid");
-          } else if (error instanceof HttpNotFoundError) {
-            setError("notfound");
-          } else {
-            console.error(error);
-            setError("error");
-          }
-        }
-      );
-  }, currentPage < totalPage);
-
-  if (error === "offline") {
-    return (
-      <div className={className} style={style}>
-        Offline.
-      </div>
-    );
-  } else if (error === "notfound") {
-    return (
-      <div className={className} style={style}>
-        Not exist.
-      </div>
-    );
-  } else if (error === "forbid") {
-    return (
-      <div className={className} style={style}>
-        Forbid.
-      </div>
-    );
-  } else if (error === "error") {
-    return (
-      <div className={className} style={style}>
-        Error.
-      </div>
-    );
-  }
-  return (
-    <>
-      {timeline == null && posts == null && <TimelineLoading />}
-      {timeline && (
-        <TimelineCard
-          className="timeline-card"
-          timeline={timeline}
-          connectionStatus={signalrState}
-          onReload={updateTimeline}
-        />
-      )}
-      {posts && (
-        <div style={style} className={classnames("timeline", className)}>
-          <TimelineEmptyItem className="timeline-top" height={50} />
-          {timeline?.postable ? (
-            <TimelinePostEdit timeline={timeline} onPosted={updatePosts} />
-          ) : user == null ? (
-            <TimelinePostEditNoLogin />
-          ) : null}
-          <TimelinePostListView posts={posts} onReload={updatePosts} />
-        </div>
-      )}
-    </>
-  );
-};
-
-export default Timeline;
diff --git a/FrontEnd/src/views/timeline/TimelineCard.tsx b/FrontEnd/src/views/timeline/TimelineCard.tsx
deleted file mode 100644
index fdf7f0a0..00000000
--- a/FrontEnd/src/views/timeline/TimelineCard.tsx
+++ /dev/null
@@ -1,167 +0,0 @@
-import * as React from "react";
-import { useTranslation } from "react-i18next";
-import classnames from "classnames";
-import { HubConnectionState } from "@microsoft/signalr";
-
-import { useIsSmallScreen } from "@/utilities/hooks";
-import { timelineVisibilityTooltipTranslationMap } from "@/services/timeline";
-import { useUser } from "@/services/user";
-import { pushAlert } from "@/services/alert";
-import { HttpTimelineInfo } from "@/http/timeline";
-import { getHttpBookmarkClient } from "@/http/bookmark";
-
-import UserAvatar from "../common/user/UserAvatar";
-import PopupMenu from "../common/menu/PopupMenu";
-import FullPageDialog from "../common/dialog/FullPageDialog";
-import Card from "../common/Card";
-import TimelineDeleteDialog from "./TimelineDeleteDialog";
-import ConnectionStatusBadge from "./ConnectionStatusBadge";
-import CollapseButton from "./CollapseButton";
-import { TimelineMemberDialog } from "./TimelineMember";
-import TimelinePropertyChangeDialog from "./TimelinePropertyChangeDialog";
-import IconButton from "../common/button/IconButton";
-
-export interface TimelinePageCardProps {
-  timeline: HttpTimelineInfo;
-  connectionStatus: HubConnectionState;
-  className?: string;
-  onReload: () => void;
-}
-
-const TimelineCard: React.FC<TimelinePageCardProps> = (props) => {
-  const { timeline, connectionStatus, onReload, className } = props;
-
-  const { t } = useTranslation();
-
-  const [dialog, setDialog] = React.useState<
-    "member" | "property" | "delete" | null
-  >(null);
-
-  const [collapse, setCollapse] = React.useState(true);
-  const toggleCollapse = (): void => {
-    setCollapse((o) => !o);
-  };
-
-  const isSmallScreen = useIsSmallScreen();
-
-  const user = useUser();
-
-  const content = (
-    <>
-      <h3 className="cru-color-primary d-inline-block align-middle">
-        {timeline.title}
-        <small className="ms-3 cru-color-secondary">{timeline.nameV2}</small>
-      </h3>
-      <div>
-        <UserAvatar
-          username={timeline.owner.username}
-          className="cru-avatar small cru-round me-3"
-        />
-        {timeline.owner.nickname}
-        <small className="ms-3 cru-color-secondary">
-          @{timeline.owner.username}
-        </small>
-      </div>
-      <p className="mb-0">{timeline.description}</p>
-      <small className="mt-1 d-block">
-        {t(timelineVisibilityTooltipTranslationMap[timeline.visibility])}
-      </small>
-      <div className="mt-2 cru-text-end">
-        {user != null ? (
-          <IconButton
-            icon={timeline.isBookmark ? "bookmark-fill" : "bookmark"}
-            className="me-3"
-            onClick={() => {
-              getHttpBookmarkClient()
-                [timeline.isBookmark ? "delete" : "post"](
-                  user.username,
-                  timeline.owner.username,
-                  timeline.nameV2
-                )
-                .then(onReload, () => {
-                  pushAlert({
-                    message: timeline.isBookmark
-                      ? "timeline.removeBookmarkFail"
-                      : "timeline.addBookmarkFail",
-                    type: "danger",
-                  });
-                });
-            }}
-          />
-        ) : null}
-        <IconButton
-          icon="people"
-          className="me-3"
-          onClick={() => setDialog("member")}
-        />
-        {timeline.manageable ? (
-          <PopupMenu
-            items={[
-              {
-                type: "button",
-                text: "timeline.manageItem.property",
-                onClick: () => setDialog("property"),
-              },
-              { type: "divider" },
-              {
-                type: "button",
-                onClick: () => setDialog("delete"),
-                color: "danger",
-                text: "timeline.manageItem.delete",
-              },
-            ]}
-            containerClassName="d-inline"
-          >
-            <IconButton icon="three-dots-vertical" />
-          </PopupMenu>
-        ) : null}
-      </div>
-    </>
-  );
-
-  return (
-    <>
-      <Card className={classnames("p-2 cru-clearfix", className)}>
-        <div
-          className={classnames(
-            "cru-float-right d-flex align-items-center",
-            !collapse && "ms-3"
-          )}
-        >
-          <ConnectionStatusBadge status={connectionStatus} className="me-2" />
-          <CollapseButton collapse={collapse} onClick={toggleCollapse} />
-        </div>
-        {isSmallScreen ? (
-          <FullPageDialog
-            onBack={toggleCollapse}
-            show={!collapse}
-            contentContainerClassName="p-2"
-          >
-            {content}
-          </FullPageDialog>
-        ) : (
-          <div style={{ display: collapse ? "none" : "inline" }}>{content}</div>
-        )}
-      </Card>
-      <TimelineMemberDialog
-        timeline={timeline}
-        onClose={() => setDialog(null)}
-        open={dialog === "member"}
-        onChange={onReload}
-      />
-      <TimelinePropertyChangeDialog
-        timeline={timeline}
-        close={() => setDialog(null)}
-        open={dialog === "property"}
-        onChange={onReload}
-      />
-      <TimelineDeleteDialog
-        timeline={timeline}
-        open={dialog === "delete"}
-        close={() => setDialog(null)}
-      />
-    </>
-  );
-};
-
-export default TimelineCard;
diff --git a/FrontEnd/src/views/timeline/TimelineDateLabel.tsx b/FrontEnd/src/views/timeline/TimelineDateLabel.tsx
deleted file mode 100644
index 5f4ac706..00000000
--- a/FrontEnd/src/views/timeline/TimelineDateLabel.tsx
+++ /dev/null
@@ -1,19 +0,0 @@
-import * as React from "react";
-import TimelineLine from "./TimelineLine";
-
-export interface TimelineDateItemProps {
-  date: Date;
-}
-
-const TimelineDateLabel: React.FC<TimelineDateItemProps> = ({ date }) => {
-  return (
-    <div className="timeline-date-item">
-      <TimelineLine center="none" />
-      <div className="timeline-date-item-badge">
-        {date.toLocaleDateString()}
-      </div>
-    </div>
-  );
-};
-
-export default TimelineDateLabel;
diff --git a/FrontEnd/src/views/timeline/TimelineDeleteDialog.tsx b/FrontEnd/src/views/timeline/TimelineDeleteDialog.tsx
deleted file mode 100644
index c960b3c2..00000000
--- a/FrontEnd/src/views/timeline/TimelineDeleteDialog.tsx
+++ /dev/null
@@ -1,61 +0,0 @@
-import * as React from "react";
-import { useNavigate } from "react-router-dom";
-import { Trans } from "react-i18next";
-
-import { getHttpTimelineClient, HttpTimelineInfo } from "@/http/timeline";
-
-import OperationDialog from "../common/dialog/OperationDialog";
-
-interface TimelineDeleteDialog {
-  timeline: HttpTimelineInfo;
-  open: boolean;
-  close: () => void;
-}
-
-const TimelineDeleteDialog: React.FC<TimelineDeleteDialog> = (props) => {
-  const navigate = useNavigate();
-
-  const { timeline } = props;
-
-  return (
-    <OperationDialog
-      open={props.open}
-      onClose={props.close}
-      title="timeline.deleteDialog.title"
-      themeColor="danger"
-      inputPrompt={() => {
-        return (
-          <Trans
-            i18nKey="timeline.deleteDialog.inputPrompt"
-            values={{ name: timeline.nameV2 }}
-          >
-            0<code className="mx-2">1</code>2
-          </Trans>
-        );
-      }}
-      inputScheme={[
-        {
-          type: "text",
-        },
-      ]}
-      inputValidator={([value]) => {
-        if (value !== timeline.nameV2) {
-          return { 0: "timeline.deleteDialog.notMatch" };
-        } else {
-          return null;
-        }
-      }}
-      onProcess={() => {
-        return getHttpTimelineClient().deleteTimeline(
-          timeline.owner.username,
-          timeline.nameV2
-        );
-      }}
-      onSuccessAndClose={() => {
-        navigate("/", { replace: true });
-      }}
-    />
-  );
-};
-
-export default TimelineDeleteDialog;
diff --git a/FrontEnd/src/views/timeline/TimelineEmptyItem.tsx b/FrontEnd/src/views/timeline/TimelineEmptyItem.tsx
deleted file mode 100644
index 5e0728d4..00000000
--- a/FrontEnd/src/views/timeline/TimelineEmptyItem.tsx
+++ /dev/null
@@ -1,25 +0,0 @@
-import * as React from "react";
-import classnames from "classnames";
-
-import TimelineLine, { TimelineLineProps } from "./TimelineLine";
-
-export interface TimelineEmptyItemProps extends Partial<TimelineLineProps> {
-  height?: number | string;
-  className?: string;
-  style?: React.CSSProperties;
-}
-
-const TimelineEmptyItem: React.FC<TimelineEmptyItemProps> = (props) => {
-  const { height, style, className, center, ...lineProps } = props;
-
-  return (
-    <div
-      style={{ ...style, height: height }}
-      className={classnames("timeline-item", className)}
-    >
-      <TimelineLine center={center ?? "none"} {...lineProps} />
-    </div>
-  );
-};
-
-export default TimelineEmptyItem;
diff --git a/FrontEnd/src/views/timeline/TimelineLine.tsx b/FrontEnd/src/views/timeline/TimelineLine.tsx
deleted file mode 100644
index 4a87e6e0..00000000
--- a/FrontEnd/src/views/timeline/TimelineLine.tsx
+++ /dev/null
@@ -1,51 +0,0 @@
-import * as React from "react";
-import classnames from "classnames";
-
-export interface TimelineLineProps {
-  current?: boolean;
-  startSegmentLength?: string | number;
-  center: "node" | "loading" | "none";
-  className?: string;
-  style?: React.CSSProperties;
-}
-
-const TimelineLine: React.FC<TimelineLineProps> = ({
-  startSegmentLength,
-  center,
-  current,
-  className,
-  style,
-}) => {
-  return (
-    <div
-      className={classnames(
-        "timeline-line",
-        current && "current",
-        center === "loading" && "loading",
-        className
-      )}
-      style={style}
-    >
-      <div className="segment start" style={{ height: startSegmentLength }} />
-      {center !== "none" ? (
-        <div className="node-container">
-          <div className="node"></div>
-          {center === "loading" ? (
-            <svg className="node-loading-edge" viewBox="0 0 100 100">
-              <path
-                d="M 50,10 A 40 40 45 0 1 78.28,21.72"
-                stroke="currentcolor"
-                strokeLinecap="square"
-                strokeWidth="8"
-              />
-            </svg>
-          ) : null}
-        </div>
-      ) : null}
-      {center !== "loading" ? <div className="segment end"></div> : null}
-      {current && <div className="segment current-end" />}
-    </div>
-  );
-};
-
-export default TimelineLine;
diff --git a/FrontEnd/src/views/timeline/TimelineLoading.tsx b/FrontEnd/src/views/timeline/TimelineLoading.tsx
deleted file mode 100644
index f876cba9..00000000
--- a/FrontEnd/src/views/timeline/TimelineLoading.tsx
+++ /dev/null
@@ -1,16 +0,0 @@
-import * as React from "react";
-
-import TimelineEmptyItem from "./TimelineEmptyItem";
-
-const TimelineLoading: React.FC = () => {
-  return (
-    <TimelineEmptyItem
-      className="timeline-top-loading-enter"
-      height={100}
-      center="loading"
-      startSegmentLength={56}
-    />
-  );
-};
-
-export default TimelineLoading;
diff --git a/FrontEnd/src/views/timeline/TimelineMember.css b/FrontEnd/src/views/timeline/TimelineMember.css
deleted file mode 100644
index adb78764..00000000
--- a/FrontEnd/src/views/timeline/TimelineMember.css
+++ /dev/null
@@ -1,8 +0,0 @@
-.timeline-member-item {

-  border: var(--cru-background-1-color) solid;

-  border-width: 0.5px 1px;

-}

-

-.timeline-member-item > div {

-  padding: 0.5em;

-}

diff --git a/FrontEnd/src/views/timeline/TimelineMember.tsx b/FrontEnd/src/views/timeline/TimelineMember.tsx
deleted file mode 100644
index aaafd173..00000000
--- a/FrontEnd/src/views/timeline/TimelineMember.tsx
+++ /dev/null
@@ -1,202 +0,0 @@
-import { useState } from "react";
-import * as React from "react";
-import { useTranslation } from "react-i18next";
-
-import { convertI18nText, I18nText } from "@/common";
-
-import { HttpUser } from "@/http/user";
-import { getHttpSearchClient } from "@/http/search";
-import { getHttpTimelineClient, HttpTimelineInfo } from "@/http/timeline";
-
-import SearchInput from "../common/SearchInput";
-import UserAvatar from "../common/user/UserAvatar";
-import Button from "../common/button/Button";
-import Dialog from "../common/dialog/Dialog";
-
-import "./TimelineMember.css";
-
-const TimelineMemberItem: React.FC<{
-  user: HttpUser;
-  add?: boolean;
-  onAction?: (username: string) => void;
-}> = ({ user, add, onAction }) => {
-  return (
-    <div className="container timeline-member-item">
-      <div className="row">
-        <div className="col col-auto">
-          <UserAvatar username={user.username} className="cru-avatar small" />
-        </div>
-        <div className="col">
-          <div className="row">{user.nickname}</div>
-          <small className="row">{"@" + user.username}</small>
-        </div>
-        {onAction ? (
-          <div className="col col-auto">
-            <Button
-              text={`timeline.member.${add ? "add" : "remove"}`}
-              color={add ? "success" : "danger"}
-              onClick={() => {
-                onAction(user.username);
-              }}
-            />
-          </div>
-        ) : null}
-      </div>
-    </div>
-  );
-};
-
-const TimelineMemberUserSearch: React.FC<{
-  timeline: HttpTimelineInfo;
-  onChange: () => void;
-}> = ({ timeline, onChange }) => {
-  const { t } = useTranslation();
-
-  const [userSearchText, setUserSearchText] = useState<string>("");
-  const [userSearchState, setUserSearchState] = useState<
-    | {
-        type: "users";
-        data: HttpUser[];
-      }
-    | { type: "error"; data: I18nText }
-    | { type: "loading" }
-    | { type: "init" }
-  >({ type: "init" });
-
-  return (
-    <>
-      <SearchInput
-        className="mt-3"
-        value={userSearchText}
-        onChange={(v) => {
-          setUserSearchText(v);
-        }}
-        loading={userSearchState.type === "loading"}
-        onButtonClick={() => {
-          if (userSearchText === "") {
-            setUserSearchState({
-              type: "error",
-              data: "login.emptyUsername",
-            });
-            return;
-          }
-          setUserSearchState({ type: "loading" });
-          getHttpSearchClient()
-            .searchUsers(userSearchText)
-            .then(
-              (users) => {
-                users = users.filter(
-                  (user) =>
-                    timeline.members.findIndex(
-                      (m) => m.username === user.username
-                    ) === -1 && timeline.owner.username !== user.username
-                );
-                setUserSearchState({ type: "users", data: users });
-              },
-              (e) => {
-                setUserSearchState({
-                  type: "error",
-                  data: { type: "custom", value: String(e) },
-                });
-              }
-            );
-        }}
-      />
-      {(() => {
-        if (userSearchState.type === "users") {
-          const users = userSearchState.data;
-          if (users.length === 0) {
-            return <div>{t("timeline.member.noUserAvailableToAdd")}</div>;
-          } else {
-            return (
-              <div className="mt-2">
-                {users.map((user) => (
-                  <TimelineMemberItem
-                    key={user.username}
-                    user={user}
-                    add
-                    onAction={() => {
-                      void getHttpTimelineClient()
-                        .memberPut(
-                          timeline.owner.username,
-                          timeline.nameV2,
-                          user.username
-                        )
-                        .then(() => {
-                          setUserSearchText("");
-                          setUserSearchState({ type: "init" });
-                          onChange();
-                        });
-                    }}
-                  />
-                ))}
-              </div>
-            );
-          }
-        } else if (userSearchState.type === "error") {
-          return (
-            <div className="cru-color-danger">
-              {convertI18nText(userSearchState.data, t)}
-            </div>
-          );
-        }
-      })()}
-    </>
-  );
-};
-
-export interface TimelineMemberProps {
-  timeline: HttpTimelineInfo;
-  onChange: () => void;
-}
-
-const TimelineMember: React.FC<TimelineMemberProps> = (props) => {
-  const { timeline, onChange } = props;
-  const members = [timeline.owner, ...timeline.members];
-
-  return (
-    <div className="container px-4 py-3">
-      <div>
-        {members.map((member, index) => (
-          <TimelineMemberItem
-            key={member.username}
-            user={member}
-            onAction={
-              timeline.manageable && index !== 0
-                ? () => {
-                    void getHttpTimelineClient()
-                      .memberDelete(
-                        timeline.owner.username,
-                        timeline.nameV2,
-                        member.username
-                      )
-                      .then(onChange);
-                  }
-                : undefined
-            }
-          />
-        ))}
-      </div>
-      {timeline.manageable ? (
-        <TimelineMemberUserSearch timeline={timeline} onChange={onChange} />
-      ) : null}
-    </div>
-  );
-};
-
-export default TimelineMember;
-
-export interface TimelineMemberDialogProps extends TimelineMemberProps {
-  open: boolean;
-  onClose: () => void;
-}
-
-export const TimelineMemberDialog: React.FC<TimelineMemberDialogProps> = (
-  props
-) => {
-  return (
-    <Dialog open={props.open} onClose={props.onClose}>
-      <TimelineMember {...props} />
-    </Dialog>
-  );
-};
diff --git a/FrontEnd/src/views/timeline/TimelinePostContentView.tsx b/FrontEnd/src/views/timeline/TimelinePostContentView.tsx
deleted file mode 100644
index 9ed192e5..00000000
--- a/FrontEnd/src/views/timeline/TimelinePostContentView.tsx
+++ /dev/null
@@ -1,187 +0,0 @@
-import * as React from "react";
-import classnames from "classnames";
-import { marked } from "marked";
-
-import { UiLogicError } from "@/common";
-
-import { HttpNetworkError } from "@/http/common";
-import { getHttpTimelineClient, HttpTimelinePostInfo } from "@/http/timeline";
-
-import { useUser } from "@/services/user";
-
-import Skeleton from "../common/Skeleton";
-import LoadFailReload from "../common/LoadFailReload";
-
-const TextView: React.FC<TimelinePostContentViewProps> = (props) => {
-  const { post, className, style } = props;
-
-  const [text, setText] = React.useState<string | null>(null);
-  const [error, setError] = React.useState<"offline" | "error" | null>(null);
-
-  const [reloadKey, setReloadKey] = React.useState<number>(0);
-
-  React.useEffect(() => {
-    let subscribe = true;
-
-    setText(null);
-    setError(null);
-
-    void getHttpTimelineClient()
-      .getPostDataAsString(post.timelineOwnerV2, post.timelineNameV2, post.id)
-      .then(
-        (data) => {
-          if (subscribe) setText(data);
-        },
-        (error) => {
-          if (subscribe) {
-            if (error instanceof HttpNetworkError) {
-              setError("offline");
-            } else {
-              setError("error");
-            }
-          }
-        }
-      );
-
-    return () => {
-      subscribe = false;
-    };
-  }, [post.timelineOwnerV2, post.timelineNameV2, post.id, reloadKey]);
-
-  if (error != null) {
-    return (
-      <LoadFailReload
-        className={className}
-        style={style}
-        onReload={() => setReloadKey(reloadKey + 1)}
-      />
-    );
-  } else if (text == null) {
-    return <Skeleton />;
-  } else {
-    return (
-      <div className={className} style={style}>
-        {text}
-      </div>
-    );
-  }
-};
-
-const ImageView: React.FC<TimelinePostContentViewProps> = (props) => {
-  const { post, className, style } = props;
-
-  useUser();
-
-  return (
-    <img
-      src={getHttpTimelineClient().generatePostDataUrl(
-        post.timelineOwnerV2,
-        post.timelineNameV2,
-        post.id
-      )}
-      className={classnames(className, "timeline-content-image")}
-      style={style}
-    />
-  );
-};
-
-const MarkdownView: React.FC<TimelinePostContentViewProps> = (props) => {
-  const { post, className, style } = props;
-
-  const [markdown, setMarkdown] = React.useState<string | null>(null);
-  const [error, setError] = React.useState<"offline" | "error" | null>(null);
-
-  const [reloadKey, setReloadKey] = React.useState<number>(0);
-
-  React.useEffect(() => {
-    let subscribe = true;
-
-    setMarkdown(null);
-    setError(null);
-
-    void getHttpTimelineClient()
-      .getPostDataAsString(post.timelineOwnerV2, post.timelineNameV2, post.id)
-      .then(
-        (data) => {
-          if (subscribe) setMarkdown(data);
-        },
-        (error) => {
-          if (subscribe) {
-            if (error instanceof HttpNetworkError) {
-              setError("offline");
-            } else {
-              setError("error");
-            }
-          }
-        }
-      );
-
-    return () => {
-      subscribe = false;
-    };
-  }, [post.timelineOwnerV2, post.timelineNameV2, post.id, reloadKey]);
-
-  const markdownHtml = React.useMemo<string | null>(() => {
-    if (markdown == null) return null;
-    return marked.parse(markdown);
-  }, [markdown]);
-
-  if (error != null) {
-    return (
-      <LoadFailReload
-        className={className}
-        style={style}
-        onReload={() => setReloadKey(reloadKey + 1)}
-      />
-    );
-  } else if (markdown == null) {
-    return <Skeleton />;
-  } else {
-    if (markdownHtml == null) {
-      throw new UiLogicError("Markdown is not null but markdown html is.");
-    }
-    return (
-      <div
-        className={classnames(className, "markdown-container")}
-        style={style}
-        dangerouslySetInnerHTML={{
-          __html: markdownHtml,
-        }}
-      />
-    );
-  }
-};
-
-export interface TimelinePostContentViewProps {
-  post: HttpTimelinePostInfo;
-  className?: string;
-  style?: React.CSSProperties;
-}
-
-const viewMap: Record<string, React.FC<TimelinePostContentViewProps>> = {
-  "text/plain": TextView,
-  "text/markdown": MarkdownView,
-  "image/png": ImageView,
-  "image/jpeg": ImageView,
-  "image/gif": ImageView,
-  "image/webp": ImageView,
-};
-
-const TimelinePostContentView: React.FC<TimelinePostContentViewProps> = (
-  props
-) => {
-  const { post, className, style } = props;
-
-  const type = post.dataList[0].kind;
-
-  if (type in viewMap) {
-    const View = viewMap[type];
-    return <View post={post} className={className} style={style} />;
-  } else {
-    // TODO: i18n
-    console.error("Unknown post type", post);
-    return <div>Error, unknown post type!</div>;
-  }
-};
-
-export default TimelinePostContentView;
diff --git a/FrontEnd/src/views/timeline/TimelinePostEdit.css b/FrontEnd/src/views/timeline/TimelinePostEdit.css
deleted file mode 100644
index 9b7629e2..00000000
--- a/FrontEnd/src/views/timeline/TimelinePostEdit.css
+++ /dev/null
@@ -1,10 +0,0 @@
-.timeline-post-edit {

-  position: sticky !important;

-  top: 106px;

-  z-index: 100;

-}

-

-.timeline-post-edit-image {

-  max-width: 100px;

-  max-height: 100px;

-}

diff --git a/FrontEnd/src/views/timeline/TimelinePostEdit.tsx b/FrontEnd/src/views/timeline/TimelinePostEdit.tsx
deleted file mode 100644
index 38e72264..00000000
--- a/FrontEnd/src/views/timeline/TimelinePostEdit.tsx
+++ /dev/null
@@ -1,267 +0,0 @@
-import * as React from "react";
-import { useTranslation } from "react-i18next";
-
-import { UiLogicError } from "@/common";
-
-import {
-  getHttpTimelineClient,
-  HttpTimelineInfo,
-  HttpTimelinePostInfo,
-  HttpTimelinePostPostRequestData,
-} from "@/http/timeline";
-
-import { pushAlert } from "@/services/alert";
-
-import base64 from "@/utilities/base64";
-
-import BlobImage from "../common/BlobImage";
-import LoadingButton from "../common/button/LoadingButton";
-import PopupMenu from "../common/menu/PopupMenu";
-import MarkdownPostEdit from "./MarkdownPostEdit";
-import TimelinePostEditCard from "./TimelinePostEditCard";
-import IconButton from "../common/button/IconButton";
-
-import "./TimelinePostEdit.css";
-
-interface TimelinePostEditTextProps {
-  text: string;
-  disabled: boolean;
-  onChange: (text: string) => void;
-  className?: string;
-  style?: React.CSSProperties;
-}
-
-const TimelinePostEditText: React.FC<TimelinePostEditTextProps> = (props) => {
-  const { text, disabled, onChange, className, style } = props;
-
-  return (
-    <textarea
-      value={text}
-      disabled={disabled}
-      onChange={(event) => {
-        onChange(event.target.value);
-      }}
-      className={className}
-      style={style}
-    />
-  );
-};
-
-interface TimelinePostEditImageProps {
-  onSelect: (file: File | null) => void;
-  disabled: boolean;
-}
-
-const TimelinePostEditImage: React.FC<TimelinePostEditImageProps> = (props) => {
-  const { onSelect, disabled } = props;
-
-  const { t } = useTranslation();
-
-  const [file, setFile] = React.useState<File | null>(null);
-  const [error, setError] = React.useState<boolean>(false);
-
-  const onInputChange: React.ChangeEventHandler<HTMLInputElement> = (e) => {
-    setError(false);
-    const files = e.target.files;
-    if (files == null || files.length === 0) {
-      setFile(null);
-      onSelect(null);
-    } else {
-      setFile(files[0]);
-    }
-  };
-
-  React.useEffect(() => {
-    return () => {
-      onSelect(null);
-    };
-  }, [onSelect]);
-
-  return (
-    <>
-      <input
-        type="file"
-        onChange={onInputChange}
-        accept="image/*"
-        disabled={disabled}
-        className="mx-3 my-1"
-      />
-      {file != null && !error && (
-        <BlobImage
-          blob={file}
-          className="timeline-post-edit-image"
-          onLoad={() => onSelect(file)}
-          onError={() => {
-            onSelect(null);
-            setError(true);
-          }}
-        />
-      )}
-      {error ? <div className="text-danger">{t("loadImageError")}</div> : null}
-    </>
-  );
-};
-
-type PostKind = "text" | "markdown" | "image";
-
-const postKindIconMap: Record<PostKind, string> = {
-  text: "fonts",
-  markdown: "markdown",
-  image: "image",
-};
-
-export interface TimelinePostEditProps {
-  className?: string;
-  style?: React.CSSProperties;
-  timeline: HttpTimelineInfo;
-  onPosted: (newPost: HttpTimelinePostInfo) => void;
-}
-
-const TimelinePostEdit: React.FC<TimelinePostEditProps> = (props) => {
-  const { timeline, style, className, onPosted } = props;
-
-  const { t } = useTranslation();
-
-  const [process, setProcess] = React.useState<boolean>(false);
-
-  const [kind, setKind] = React.useState<Exclude<PostKind, "markdown">>("text");
-  const [showMarkdown, setShowMarkdown] = React.useState<boolean>(false);
-
-  const [text, setText] = React.useState<string>("");
-  const [image, setImage] = React.useState<File | null>(null);
-
-  const draftTextLocalStorageKey = `timeline.${timeline.owner.username}.${timeline.nameV2}.postDraft.text`;
-
-  React.useEffect(() => {
-    setText(window.localStorage.getItem(draftTextLocalStorageKey) ?? "");
-  }, [draftTextLocalStorageKey]);
-
-  const canSend =
-    (kind === "text" && text.length !== 0) ||
-    (kind === "image" && image != null);
-
-  const onPostError = (): void => {
-    pushAlert({
-      type: "danger",
-      message: "timeline.sendPostFailed",
-    });
-  };
-
-  const onSend = async (): Promise<void> => {
-    setProcess(true);
-
-    let requestData: HttpTimelinePostPostRequestData;
-    switch (kind) {
-      case "text":
-        requestData = {
-          contentType: "text/plain",
-          data: await base64(text),
-        };
-        break;
-      case "image":
-        if (image == null) {
-          throw new UiLogicError(
-            "Content type is image but image blob is null.",
-          );
-        }
-        requestData = {
-          contentType: image.type,
-          data: await base64(image),
-        };
-        break;
-      default:
-        throw new UiLogicError("Unknown content type.");
-    }
-
-    getHttpTimelineClient()
-      .postPost(timeline.owner.username, timeline.nameV2, {
-        dataList: [requestData],
-      })
-      .then(
-        (data) => {
-          if (kind === "text") {
-            setText("");
-            window.localStorage.removeItem(draftTextLocalStorageKey);
-          }
-          setProcess(false);
-          setKind("text");
-          onPosted(data);
-        },
-        () => {
-          setProcess(false);
-          onPostError();
-        },
-      );
-  };
-
-  return (
-    <TimelinePostEditCard className={className} style={style}>
-      {showMarkdown ? (
-        <MarkdownPostEdit
-          className="cru-fill-parent"
-          onClose={() => setShowMarkdown(false)}
-          owner={timeline.owner.username}
-          timeline={timeline.nameV2}
-          onPosted={onPosted}
-          onPostError={onPostError}
-        />
-      ) : (
-        <div className="row">
-          <div className="col px-1 py-1">
-            {(() => {
-              if (kind === "text") {
-                return (
-                  <TimelinePostEditText
-                    className="cru-fill-parent timeline-post-edit"
-                    text={text}
-                    disabled={process}
-                    onChange={(t) => {
-                      setText(t);
-                      window.localStorage.setItem(draftTextLocalStorageKey, t);
-                    }}
-                  />
-                );
-              } else if (kind === "image") {
-                return (
-                  <TimelinePostEditImage
-                    onSelect={setImage}
-                    disabled={process}
-                  />
-                );
-              }
-            })()}
-          </div>
-          <div className="col col-auto align-self-end m-1">
-            <div className="d-block cru-text-center mt-1 mb-2">
-              <PopupMenu
-                items={(["text", "image", "markdown"] as const).map((kind) => ({
-                  type: "button",
-                  text: `timeline.post.type.${kind}`,
-                  iconClassName: postKindIconMap[kind],
-                  onClick: () => {
-                    if (kind === "markdown") {
-                      setShowMarkdown(true);
-                    } else {
-                      setKind(kind);
-                    }
-                  },
-                }))}
-              >
-                <IconButton large icon={postKindIconMap[kind]} />
-              </PopupMenu>
-            </div>
-            <LoadingButton
-              onClick={() => void onSend()}
-              disabled={!canSend}
-              loading={process}
-            >
-              {t("timeline.send")}
-            </LoadingButton>
-          </div>
-        </div>
-      )}
-    </TimelinePostEditCard>
-  );
-};
-
-export default TimelinePostEdit;
diff --git a/FrontEnd/src/views/timeline/TimelinePostEditCard.tsx b/FrontEnd/src/views/timeline/TimelinePostEditCard.tsx
deleted file mode 100644
index d2f7bd72..00000000
--- a/FrontEnd/src/views/timeline/TimelinePostEditCard.tsx
+++ /dev/null
@@ -1,31 +0,0 @@
-import * as React from "react";
-import classnames from "classnames";
-
-import Card from "../common/Card";
-import TimelineLine from "./TimelineLine";
-
-import "./TimelinePostEdit.css";
-
-export interface TimelinePostEditCardProps {
-  className?: string;
-  style?: React.CSSProperties;
-  children?: React.ReactNode;
-}
-
-const TimelinePostEdit: React.FC<TimelinePostEditCardProps> = ({
-  className,
-  style,
-  children,
-}) => {
-  return (
-    <div
-      className={classnames("timeline-item timeline-post-edit", className)}
-      style={style}
-    >
-      <TimelineLine center="node" />
-      <Card className="timeline-item-card">{children}</Card>
-    </div>
-  );
-};
-
-export default TimelinePostEdit;
diff --git a/FrontEnd/src/views/timeline/TimelinePostEditNoLogin.tsx b/FrontEnd/src/views/timeline/TimelinePostEditNoLogin.tsx
deleted file mode 100644
index 1ef0a287..00000000
--- a/FrontEnd/src/views/timeline/TimelinePostEditNoLogin.tsx
+++ /dev/null
@@ -1,18 +0,0 @@
-import * as React from "react";
-import { Trans } from "react-i18next";
-import { Link } from "react-router-dom";
-
-import TimelinePostEditCard from "./TimelinePostEditCard";
-
-export default function TimelinePostEditNoLogin(): React.ReactElement | null {
-  return (
-    <TimelinePostEditCard>
-      <div className="mt-3 mb-4">
-        <Trans
-          i18nKey="timeline.postNoLogin"
-          components={{ l: <Link to="/login" /> }}
-        />
-      </div>
-    </TimelinePostEditCard>
-  );
-}
diff --git a/FrontEnd/src/views/timeline/TimelinePostListView.tsx b/FrontEnd/src/views/timeline/TimelinePostListView.tsx
deleted file mode 100644
index f878b004..00000000
--- a/FrontEnd/src/views/timeline/TimelinePostListView.tsx
+++ /dev/null
@@ -1,76 +0,0 @@
-import { Fragment } from "react";
-import * as React from "react";
-
-import { HttpTimelinePostInfo } from "@/http/timeline";
-
-import TimelinePostView from "./TimelinePostView";
-import TimelineDateLabel from "./TimelineDateLabel";
-
-function dateEqual(left: Date, right: Date): boolean {
-  return (
-    left.getDate() == right.getDate() &&
-    left.getMonth() == right.getMonth() &&
-    left.getFullYear() == right.getFullYear()
-  );
-}
-
-export interface TimelinePostListViewProps {
-  posts: HttpTimelinePostInfo[];
-  onReload: () => void;
-}
-
-const TimelinePostListView: React.FC<TimelinePostListViewProps> = (props) => {
-  const { posts, onReload } = props;
-
-  const groupedPosts = React.useMemo<
-    {
-      date: Date;
-      posts: (HttpTimelinePostInfo & { index: number })[];
-    }[]
-  >(() => {
-    const result: {
-      date: Date;
-      posts: (HttpTimelinePostInfo & { index: number })[];
-    }[] = [];
-    let index = 0;
-    for (const post of posts) {
-      const time = new Date(post.time);
-      if (result.length === 0) {
-        result.push({ date: time, posts: [{ ...post, index }] });
-      } else {
-        const lastGroup = result[result.length - 1];
-        if (dateEqual(lastGroup.date, time)) {
-          lastGroup.posts.push({ ...post, index });
-        } else {
-          result.push({ date: time, posts: [{ ...post, index }] });
-        }
-      }
-      index++;
-    }
-    return result;
-  }, [posts]);
-
-  return (
-    <>
-      {groupedPosts.map((group) => {
-        return (
-          <Fragment key={group.date.toDateString()}>
-            <TimelineDateLabel date={group.date} />
-            {group.posts.map((post) => {
-              return (
-                <TimelinePostView
-                  key={post.id}
-                  post={post}
-                  onChanged={onReload}
-                  onDeleted={onReload}
-                />
-              );
-            })}
-          </Fragment>
-        );
-      })}
-    </>
-  );
-};
-
-export default TimelinePostListView;
diff --git a/FrontEnd/src/views/timeline/TimelinePostView.tsx b/FrontEnd/src/views/timeline/TimelinePostView.tsx
deleted file mode 100644
index e3eac0f4..00000000
--- a/FrontEnd/src/views/timeline/TimelinePostView.tsx
+++ /dev/null
@@ -1,159 +0,0 @@
-import * as React from "react";
-import classnames from "classnames";
-
-import { getHttpTimelineClient, HttpTimelinePostInfo } from "@/http/timeline";
-
-import { pushAlert } from "@/services/alert";
-
-import { useClickOutside } from "@/utilities/hooks";
-
-import UserAvatar from "../common/user/UserAvatar";
-import Card from "../common/Card";
-import FlatButton from "../common/button/FlatButton";
-import ConfirmDialog from "../common/dialog/ConfirmDialog";
-import TimelineLine from "./TimelineLine";
-import TimelinePostContentView from "./TimelinePostContentView";
-import PostPropertyChangeDialog from "./PostPropertyChangeDialog";
-import IconButton from "../common/button/IconButton";
-
-export interface TimelinePostViewProps {
-  post: HttpTimelinePostInfo;
-  className?: string;
-  style?: React.CSSProperties;
-  cardStyle?: React.CSSProperties;
-  onChanged: (post: HttpTimelinePostInfo) => void;
-  onDeleted: () => void;
-}
-
-const TimelinePostView: React.FC<TimelinePostViewProps> = (props) => {
-  const { post, className, style, cardStyle, onChanged, onDeleted } = props;
-
-  const [operationMaskVisible, setOperationMaskVisible] =
-    React.useState<boolean>(false);
-  const [dialog, setDialog] = React.useState<
-    "delete" | "changeproperty" | null
-  >(null);
-
-  const [maskElement, setMaskElement] = React.useState<HTMLElement | null>(
-    null
-  );
-
-  useClickOutside(maskElement, () => setOperationMaskVisible(false));
-
-  const cardRef = React.useRef<HTMLDivElement>(null);
-  React.useEffect(() => {
-    const cardIntersectionObserver = new IntersectionObserver(([e]) => {
-      if (e.intersectionRatio > 0) {
-        if (cardRef.current != null) {
-          cardRef.current.style.animationName = "timeline-post-enter";
-        }
-      }
-    });
-    if (cardRef.current) {
-      cardIntersectionObserver.observe(cardRef.current);
-    }
-
-    return () => {
-      cardIntersectionObserver.disconnect();
-    };
-  }, []);
-
-  return (
-    <div
-      id={`timeline-post-${post.id}`}
-      className={classnames("timeline-item", className)}
-      style={style}
-    >
-      <TimelineLine center="node" />
-      <Card
-        ref={cardRef}
-        className="timeline-item-card enter-animation"
-        style={cardStyle}
-      >
-        {post.editable ? (
-          <IconButton
-            icon="chevron-down"
-            color="primary-enhance"
-            className="cru-float-right"
-            onClick={(e) => {
-              setOperationMaskVisible(true);
-              e.stopPropagation();
-            }}
-          />
-        ) : null}
-        <div className="timeline-item-header">
-          <span className="me-2">
-            <span>
-              <UserAvatar
-                username={post.author.username}
-                className="timeline-avatar me-1"
-              />
-              <small className="text-dark me-2">{post.author.nickname}</small>
-              <small className="text-secondary white-space-no-wrap">
-                {new Date(post.time).toLocaleTimeString()}
-              </small>
-            </span>
-          </span>
-        </div>
-        <div className="timeline-content">
-          <TimelinePostContentView post={post} />
-        </div>
-        {operationMaskVisible ? (
-          <div
-            ref={setMaskElement}
-            className="timeline-post-item-options-mask"
-            onClick={() => {
-              setOperationMaskVisible(false);
-            }}
-          >
-            <FlatButton
-              text="changeProperty"
-              onClick={(e) => {
-                setDialog("changeproperty");
-                e.stopPropagation();
-              }}
-            />
-            <FlatButton
-              text="delete"
-              color="danger"
-              onClick={(e) => {
-                setDialog("delete");
-                e.stopPropagation();
-              }}
-            />
-          </div>
-        ) : null}
-      </Card>
-      <ConfirmDialog
-        title="timeline.post.deleteDialog.title"
-        body="timeline.post.deleteDialog.prompt"
-        open={dialog === "delete"}
-        onClose={() => {
-          setDialog(null);
-          setOperationMaskVisible(false);
-        }}
-        onConfirm={() => {
-          void getHttpTimelineClient()
-            .deletePost(post.timelineOwnerV2, post.timelineNameV2, post.id)
-            .then(onDeleted, () => {
-              pushAlert({
-                type: "danger",
-                message: "timeline.deletePostFailed",
-              });
-            });
-        }}
-      />
-      <PostPropertyChangeDialog
-        open={dialog === "changeproperty"}
-        onClose={() => {
-          setDialog(null);
-          setOperationMaskVisible(false);
-        }}
-        post={post}
-        onSuccess={onChanged}
-      />
-    </div>
-  );
-};
-
-export default TimelinePostView;
diff --git a/FrontEnd/src/views/timeline/TimelinePropertyChangeDialog.tsx b/FrontEnd/src/views/timeline/TimelinePropertyChangeDialog.tsx
deleted file mode 100644
index 63750445..00000000
--- a/FrontEnd/src/views/timeline/TimelinePropertyChangeDialog.tsx
+++ /dev/null
@@ -1,88 +0,0 @@
-import * as React from "react";
-
-import {
-  getHttpTimelineClient,
-  HttpTimelineInfo,
-  HttpTimelinePatchRequest,
-  kTimelineVisibilities,
-  TimelineVisibility,
-} from "@/http/timeline";
-
-import OperationDialog from "../common/dialog/OperationDialog";
-
-export interface TimelinePropertyChangeDialogProps {
-  open: boolean;
-  close: () => void;
-  timeline: HttpTimelineInfo;
-  onChange: () => void;
-}
-
-const labelMap: { [key in TimelineVisibility]: string } = {
-  Private: "timeline.visibility.private",
-  Public: "timeline.visibility.public",
-  Register: "timeline.visibility.register",
-};
-
-const TimelinePropertyChangeDialog: React.FC<
-  TimelinePropertyChangeDialogProps
-> = (props) => {
-  const { timeline, onChange } = props;
-
-  return (
-    <OperationDialog
-      title={"timeline.dialogChangeProperty.title"}
-      inputScheme={
-        [
-          {
-            type: "text",
-            label: "timeline.dialogChangeProperty.titleField",
-            initValue: timeline.title,
-          },
-          {
-            type: "select",
-            label: "timeline.dialogChangeProperty.visibility",
-            options: kTimelineVisibilities.map((v) => ({
-              label: labelMap[v],
-              value: v,
-            })),
-            initValue: timeline.visibility,
-          },
-          {
-            type: "text",
-            label: "timeline.dialogChangeProperty.description",
-            initValue: timeline.description,
-          },
-          {
-            type: "color",
-            label: "timeline.dialogChangeProperty.color",
-            initValue: timeline.color ?? null,
-            canBeNull: true,
-          },
-        ] as const
-      }
-      open={props.open}
-      onClose={props.close}
-      onProcess={([newTitle, newVisibility, newDescription, newColor]) => {
-        const req: HttpTimelinePatchRequest = {};
-        if (newTitle !== timeline.title) {
-          req.title = newTitle;
-        }
-        if (newVisibility !== timeline.visibility) {
-          req.visibility = newVisibility as TimelineVisibility;
-        }
-        if (newDescription !== timeline.description) {
-          req.description = newDescription;
-        }
-        const nc = newColor ?? "";
-        if (nc !== timeline.color) {
-          req.color = nc;
-        }
-        return getHttpTimelineClient()
-          .patchTimeline(timeline.owner.username, timeline.nameV2, req)
-          .then(onChange);
-      }}
-    />
-  );
-};
-
-export default TimelinePropertyChangeDialog;
diff --git a/FrontEnd/src/views/timeline/index.tsx b/FrontEnd/src/views/timeline/index.tsx
deleted file mode 100644
index 1dffdcc1..00000000
--- a/FrontEnd/src/views/timeline/index.tsx
+++ /dev/null
@@ -1,23 +0,0 @@
-import * as React from "react";
-import { useParams } from "react-router-dom";
-
-import { UiLogicError } from "@/common";
-
-import Timeline from "./Timeline";
-
-const TimelinePage: React.FC = () => {
-  const { owner, timeline: timelineNameParam } = useParams();
-
-  if (owner == null || owner == "")
-    throw new UiLogicError("Route param owner is not set.");
-
-  const timeline = timelineNameParam || "self";
-
-  return (
-    <div className="container">
-      <Timeline timelineOwner={owner} timelineName={timeline} />
-    </div>
-  );
-};
-
-export default TimelinePage;