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/stores/image-workspace.ts

@@ -9,6 +9,7 @@ import {
   renameImageWorkspaceProject,
   sendImageWorkspaceMessage,
 } from '@/lib/image-workspace';
+import { useAuthStore } from '@/stores/auth';
 import {
   IMAGE_WORKSPACE_UNAVAILABLE_CODE,
   type DesignGenerationTask,
@@ -17,7 +18,13 @@ import {
   type DesignWorkspaceSummary,
 } from '../../shared/image-workspace';
 
-export type ImageWorkspaceLoadStatus = 'idle' | 'loading' | 'ready' | 'unavailable' | 'error';
+export type ImageWorkspaceLoadStatus =
+  | 'idle'
+  | 'loading'
+  | 'ready'
+  | 'unavailable'
+  | 'error'
+  | 'auth-required';
 
 type ImageWorkspaceState = {
   status: ImageWorkspaceLoadStatus;
@@ -44,6 +51,10 @@ function unavailable(error: unknown): boolean {
     && (error.status === 501 || error.code === IMAGE_WORKSPACE_UNAVAILABLE_CODE);
 }
 
+function authenticationRequired(error: unknown): boolean {
+  return error instanceof ImageWorkspaceApiError && error.code === 'AUTH_REQUIRED';
+}
+
 function messageOf(error: unknown): string {
   return error instanceof Error ? error.message : String(error);
 }
@@ -69,6 +80,22 @@ function upsertSummary(
 }
 
 export const useImageWorkspaceStore = create<ImageWorkspaceState>((set, get) => {
+  const handleRequestError = (error: unknown): string => {
+    const message = messageOf(error);
+    if (authenticationRequired(error)) {
+      useAuthStore.getState().invalidateSession();
+      set({
+        status: 'auth-required',
+        bootstrap: null,
+        activeWorkspaceId: null,
+        workspace: null,
+        tasks: [],
+        error: message,
+      });
+    }
+    return message;
+  };
+
   const applyWorkspace = (workspace: DesignWorkspace): DesignWorkspace => {
     set((state) => ({
       status: 'ready',
@@ -139,14 +166,17 @@ export const useImageWorkspaceStore = create<ImageWorkspaceState>((set, get) =>
           if (activeWorkspaceId) await loadWorkspace(activeWorkspaceId);
           return bootstrap;
         } catch (error) {
-          set({
-            status: unavailable(error) ? 'unavailable' : 'error',
-            bootstrap: null,
-            activeWorkspaceId: null,
-            workspace: null,
-            tasks: [],
-            error: messageOf(error),
-          });
+          const message = handleRequestError(error);
+          if (!authenticationRequired(error)) {
+            set({
+              status: unavailable(error) ? 'unavailable' : 'error',
+              bootstrap: null,
+              activeWorkspaceId: null,
+              workspace: null,
+              tasks: [],
+              error: message,
+            });
+          }
           return null;
         } finally {
           inFlightLoad = null;
@@ -161,7 +191,7 @@ export const useImageWorkspaceStore = create<ImageWorkspaceState>((set, get) =>
         set({ tasks: [] });
         return workspace;
       } catch (error) {
-        set({ error: messageOf(error) });
+        set({ error: handleRequestError(error) });
         throw error;
       }
     },
@@ -170,7 +200,7 @@ export const useImageWorkspaceStore = create<ImageWorkspaceState>((set, get) =>
       try {
         return applyWorkspace(await renameImageWorkspaceProject(workspaceId, title));
       } catch (error) {
-        set({ error: messageOf(error) });
+        set({ error: handleRequestError(error) });
         throw error;
       }
     },
@@ -186,7 +216,7 @@ export const useImageWorkspaceStore = create<ImageWorkspaceState>((set, get) =>
       try {
         await loadWorkspace(workspaceId);
       } catch (error) {
-        set({ error: messageOf(error) });
+        set({ error: handleRequestError(error) });
       }
     },
 
@@ -196,7 +226,7 @@ export const useImageWorkspaceStore = create<ImageWorkspaceState>((set, get) =>
       try {
         return applyWorkspace(await fetchImageWorkspaceProject(workspaceId));
       } catch (error) {
-        set({ error: messageOf(error) });
+        set({ error: handleRequestError(error) });
         throw error;
       }
     },
@@ -212,7 +242,7 @@ export const useImageWorkspaceStore = create<ImageWorkspaceState>((set, get) =>
         set({ tasks });
         return tasks;
       } catch (error) {
-        set({ error: messageOf(error) });
+        set({ error: handleRequestError(error) });
         throw error;
       }
     },
@@ -227,7 +257,7 @@ export const useImageWorkspaceStore = create<ImageWorkspaceState>((set, get) =>
           message,
         ));
       } catch (error) {
-        set({ error: messageOf(error) });
+        set({ error: handleRequestError(error) });
         return await recoverRevisionConflict(error);
       }
     },
@@ -244,7 +274,7 @@ export const useImageWorkspaceStore = create<ImageWorkspaceState>((set, get) =>
         await get().refreshTasks().catch(() => []);
         return updated;
       } catch (error) {
-        set({ error: messageOf(error) });
+        set({ error: handleRequestError(error) });
         return await recoverRevisionConflict(error);
       }
     },