fix(web): retire session archive UI and API, restore archived rows

Remove archive/restore from the session menu and drop archived=1 listing. PATCH still accepts archived_at from old bundles then ignores it. A forward migration clears archived_at without bumping updated_at. Delete stays unchanged.

frontend/src/hooks/use-home-shell-registration.ts

@@ -40,10 +40,7 @@ type HomeShellRegistrationParams = {
   setPendingSessionDeletion: Dispatch<SetStateAction<ChatSession | null>>;
   setSessionMenuId: Dispatch<SetStateAction<string | null>>;
   shareSession: (session: ChatSession) => void | Promise<void>;
-  showArchivedSessions: boolean;
   startNewChat: () => void | Promise<unknown>;
-  toggleArchivedSession: (sessionId: string) => void;
-  toggleArchivedView: () => void | Promise<void>;
   togglePinnedSession: (sessionId: string) => void;
   visibleSessions: readonly ChatSession[];
 };
@@ -78,10 +75,7 @@ export function useHomeShellRegistration(params: HomeShellRegistrationParams) {
     setPendingSessionDeletion,
     setSessionMenuId,
     shareSession,
-    showArchivedSessions,
     startNewChat,
-    toggleArchivedSession,
-    toggleArchivedView,
     togglePinnedSession,
     visibleSessions,
   } = params;
@@ -115,13 +109,10 @@ export function useHomeShellRegistration(params: HomeShellRegistrationParams) {
         accountMenuOpen,
         accountTriggerRef: accountTrigger,
         sessionControls: {
-          archivedCount: sessions.filter((session) => session.archivedAt).length,
-          showingArchived: showArchivedSessions,
           hasMore: Boolean(sessionsCursor),
           onLoadMore: loadMoreSessions,
           menuSessionId: sessionMenuId,
           disabled: Boolean(pendingSessionId) || cancellationPending,
-          onToggleArchivedView: () => { void toggleArchivedView(); setSessionMenuId(null); },
           onMenuSessionChange: setSessionMenuId,
           onTogglePinned: togglePinnedSession,
           onRename: (sessionId) => {
@@ -132,7 +123,6 @@ export function useHomeShellRegistration(params: HomeShellRegistrationParams) {
             const session = sessions.find((candidate) => candidate.id === sessionId);
             if (session) void shareSession(session);
           },
-          onToggleArchived: toggleArchivedSession,
           onDelete: (sessionId) => {
             const session = sessions.find((candidate) => candidate.id === sessionId);
             if (session) setPendingSessionDeletion(session);
@@ -155,8 +145,7 @@ export function useHomeShellRegistration(params: HomeShellRegistrationParams) {
     rectificationErrorSessionId, rectificationOpeningSessionId, rectificationSurfaceOpen,
     registerShellControls, renameSession, selectSession, sessionMenuId, sessions,
     sessionsCursor, setAccountMenuOpen, setPendingSessionDeletion, setSessionMenuId,
-    shareSession, showArchivedSessions, startNewChat, toggleArchivedSession,
-    toggleArchivedView, togglePinnedSession, visibleSessions,
+    shareSession, startNewChat, togglePinnedSession, visibleSessions,
   ]);
 
   useEffect(() => () => registerShellControls(null), [registerShellControls]);

frontend/src/hooks/use-session-management.ts

@@ -127,7 +127,6 @@ export function useSessionManagement(params: SessionManagementParams) {
   // Owned here since 2026-09-16 (state lowering batch 2). Home reads back only
   // what its own JSX renders; the rest never leaves this hook.
   const [sessionsCursor, setSessionsCursor] = useState<string | null>(null);
-  const [showArchivedSessions, setShowArchivedSessions] = useState(false);
   const [sessionMenuId, setSessionMenuId] = useState<string | null>(null);
   const [pendingSessionDeletion, setPendingSessionDeletion] = useState<ChatSession | null>(null);
   const [sessionDetailLoadingId, setSessionDetailLoadingId] = useState<string | null>(null);
@@ -140,15 +139,7 @@ export function useSessionManagement(params: SessionManagementParams) {
     if (!isUnsavedEmptyConsultation(session)) cloudCreatedIds.current.add(session.id);
   }
 
-  const visibleSessions = sortSessions(sessions.filter((session) => {
-    if (showArchivedSessions) {
-      return Boolean(session.archivedAt)
-        && (session.sessionType === "birth_time_rectification"
-          || session.messages.length > 0
-          || !session.messagesHydrated);
-    }
-    return isListedSidebarSession(session);
-  }));
+  const visibleSessions = sortSessions(sessions.filter(isListedSidebarSession));
 
   function updateSession(sessionId: string, change: (session: ChatSession) => ChatSession) {
     setSessions((current) => current.map((session) => (session.id === sessionId ? change(session) : session)));
@@ -273,27 +264,6 @@ export function useSessionManagement(params: SessionManagementParams) {
     });
   }
 
-  function toggleArchivedSession(sessionId: string) {
-    const session = sessions.find((item) => item.id === sessionId);
-    if (!session) return;
-    const restoring = Boolean(session.archivedAt);
-    const previousActiveId = activeSessionId;
-    const nextArchivedAt = restoring ? null : new Date().toISOString();
-    updateSession(sessionId, (current) => ({ ...current, archivedAt: nextArchivedAt }));
-    if (!restoring && activeSessionId === sessionId) {
-      activateFallbackSession(visibleSessions.filter((item) => item.id !== sessionId));
-    }
-    setComposerNotice(restoring ? "已恢复到聊天记录。" : "已归档，可在左侧归档中恢复。");
-    void writeChatSession(sessionId, { archived_at: nextArchivedAt }, "update").catch((caught) => {
-      updateSession(sessionId, (current) => ({ ...current, archivedAt: session.archivedAt }));
-      if (!restoring && previousActiveId === sessionId) {
-        setActiveSessionId(previousActiveId);
-        if (!uiPreview.current) writeSessionUrl(previousActiveId || null, "replace");
-      }
-      setComposerNotice(caught instanceof Error ? caught.message : "归档同步失败");
-    });
-  }
-
   async function shareSession(session: ChatSession) {
     const sharePayload = {
       share_payload_version: 1,
@@ -404,7 +374,6 @@ export function useSessionManagement(params: SessionManagementParams) {
     try {
       const page = await fetchSessions(undefined, {
         before: sessionsCursor,
-        archived: showArchivedSessions,
       });
       const incoming = readSessions(page.sessions, modelCatalog).sessions;
       for (const session of incoming) cloudCreatedIds.current.add(session.id);
@@ -418,24 +387,6 @@ export function useSessionManagement(params: SessionManagementParams) {
     }
   }
 
-  async function toggleArchivedView() {
-    const nextArchived = !showArchivedSessions;
-    setShowArchivedSessions(nextArchived);
-    try {
-      const page = await fetchSessions(undefined, { archived: nextArchived });
-      const parsed = readSessions(page.sessions, modelCatalog).sessions;
-      for (const session of parsed) cloudCreatedIds.current.add(session.id);
-      const active = sessionsRef.current.find((session) => session.id === activeSessionId);
-      setSessions(active && !parsed.some((session) => session.id === active.id)
-        ? mergeHydratedSession(parsed, active)
-        : parsed);
-      setSessionsCursor(page.nextCursor);
-    } catch (caught) {
-      if (caught instanceof LoginRedirectError) return;
-      setComposerNotice(caught instanceof Error ? caught.message : "暂时无法读取聊天记录");
-    }
-  }
-
   applySessionPopStateRef.current = (search: string) => {
     if (uiPreview.current) return;
     const listed = sessionsRef.current;
@@ -543,7 +494,6 @@ export function useSessionManagement(params: SessionManagementParams) {
     visibleSessions,
     sessionsCursor,
     setSessionsCursor,
-    showArchivedSessions,
     sessionMenuId,
     setSessionMenuId,
     pendingSessionDeletion,
@@ -556,12 +506,10 @@ export function useSessionManagement(params: SessionManagementParams) {
     renameSession,
     deleteSession,
     togglePinnedSession,
-    toggleArchivedSession,
     shareSession,
     startNewChat,
     selectSession,
     selectSessionModel,
     loadMoreSessions,
-    toggleArchivedView,
   };
 }