fix: 修复 AI 设计会话失效后的伪登录

问题：Main 刷新令牌返回 401 后已清空会话，但 Renderer 仍保留用户信息，AI 设计持续返回 AUTH_REQUIRED。

实现：认证初始化等待 Main 同步完成；同步或刷新失败清理登录态；Workspace 识别结构化认证错误并在重新登录后恢复加载；路由守卫响应登录状态变化。

验证：49 个聚焦测试通过，TypeScript、聚焦 Lint 与 Vite 生产构建通过。

src/components/layout/ImageWorkspaceSidebar.tsx

@@ -19,6 +19,7 @@ import {
 import { IMAGE_WORKSPACE_CREATE_PROJECT_EVENT } from '@/lib/image-workspace';
 import { cn } from '@/lib/utils';
 import { useImageWorkspaceStore } from '@/stores/image-workspace';
+import { useAuthStore } from '@/stores/auth';
 import type { DesignWorkspaceSummary } from '../../../shared/image-workspace';
 
 type ImageWorkspaceSidebarProps = {
@@ -30,6 +31,7 @@ type ProjectDialogState =
   | { mode: 'rename'; project: DesignWorkspaceSummary };
 
 export function ImageWorkspaceSidebar({ sidebarCollapsed }: ImageWorkspaceSidebarProps) {
+  const authenticated = useAuthStore((state) => state.isAuthenticated());
   const navigate = useNavigate();
   const status = useImageWorkspaceStore((state) => state.status);
   const bootstrap = useImageWorkspaceStore((state) => state.bootstrap);
@@ -46,8 +48,8 @@ export function ImageWorkspaceSidebar({ sidebarCollapsed }: ImageWorkspaceSideba
   const [saving, setSaving] = useState(false);
 
   useEffect(() => {
-    if (status === 'idle') void load();
-  }, [load, status]);
+    if (status === 'idle' || (status === 'auth-required' && authenticated)) void load();
+  }, [authenticated, load, status]);
 
   useEffect(() => {
     const openCreateDialog = () => {
@@ -154,7 +156,7 @@ export function ImageWorkspaceSidebar({ sidebarCollapsed }: ImageWorkspaceSideba
               </div>
             ) : null}
 
-            {status === 'unavailable' || status === 'error' ? (
+            {status === 'unavailable' || status === 'error' || status === 'auth-required' ? (
               <div
                 data-testid="sidebar-image-workspace-unavailable"
                 className="rounded-lg border border-destructive/20 bg-destructive/5 px-3 py-3 text-xs font-medium text-muted-foreground"