加了一堆模型和一堆功能

art-agent/frontend/src/lib/app-context.tsx

@@ -40,6 +40,7 @@ interface AppContextValue {
   deleteSession: (id: string) => void;
   renameSession: (id: string, title: string) => void;
   updateSessionTags: (id: string, tags: string[]) => void;
+  updateSessionLlmModel: (id: string, llmModel: string) => void;
   appendMessage: (sessionId: string, message: ChatMessage) => void;
   updateSessionThumbnail: (sessionId: string, url: string) => void;
 
@@ -183,6 +184,17 @@ export function AppProvider({ children }: { children: ReactNode }) {
     );
   }, []);
 
+  const updateSessionLlmModel = useCallback((id: string, llmModel: string) => {
+    setSessions((prev) =>
+      prev.map((s) => {
+        if (s.id !== id) return s;
+        const updated = { ...s, llmModel, updatedAt: Date.now() };
+        storeUpdateSession(updated);
+        return updated;
+      })
+    );
+  }, []);
+
   const appendMessage = useCallback((sessionId: string, message: ChatMessage) => {
     setSessions((prev) =>
       prev.map((s) => {
@@ -266,6 +278,7 @@ export function AppProvider({ children }: { children: ReactNode }) {
       deleteSession: deleteSessionCb,
       renameSession,
       updateSessionTags,
+      updateSessionLlmModel,
       appendMessage,
       updateSessionThumbnail,
       tags,
@@ -286,7 +299,7 @@ export function AppProvider({ children }: { children: ReactNode }) {
     [
       sessions, activeSessionId, activeSession,
       createSession, switchSession, deleteSessionCb,
-      renameSession, updateSessionTags, appendMessage, updateSessionThumbnail,
+      renameSession, updateSessionTags, updateSessionLlmModel, appendMessage, updateSessionThumbnail,
       tags, addTag, deleteTagCb, selectedTagIds,
       assets, addAssetCb, updateAssetCb, deleteAssetCb, toggleFavoriteCb,
       detailImage, sidebarCollapsed,
@@ -294,7 +307,17 @@ export function AppProvider({ children }: { children: ReactNode }) {
   );
 
   // 未登录时（如 /login 页面）直接渲染 children，不注入 AppContext
-  if (!initialized) return <>{children}</>;
+  // 已登录但尚未初始化完成时显示加载状态，避免子组件调用 useApp() 拿到 null
+  if (!initialized) {
+    if (isAuthenticated) {
+      return (
+        <div className="h-screen flex items-center justify-center bg-[var(--bg-primary)]">
+          <div className="text-[var(--text-secondary)] text-sm">加载中...</div>
+        </div>
+      );
+    }
+    return <>{children}</>;
+  }
 
   return <AppContext.Provider value={value}>{children}</AppContext.Provider>;
 }