fix: 修复 AI 设计任务栏同步与独立滚动

问题：生成任务未及时出现在右侧栏，任务区与会话区还会共享外层滚动。

实现：补齐 Agent 回合与 Quote 确认后的任务同步，锁定左右滚动容器并增加桌面布局和异步任务回归测试。

src/stores/image-workspace.ts

@@ -45,6 +45,12 @@ type ImageWorkspaceState = {
 };
 
 let inFlightLoad: Promise<DesignWorkspaceBootstrap | null> | null = null;
+const GENERATION_TASK_SYNC_ATTEMPTS = 20;
+const GENERATION_TASK_SYNC_DELAY_MS = 500;
+
+function wait(milliseconds: number): Promise<void> {
+  return new Promise((resolve) => setTimeout(resolve, milliseconds));
+}
 
 function unavailable(error: unknown): boolean {
   return error instanceof ImageWorkspaceApiError
@@ -107,6 +113,21 @@ export const useImageWorkspaceStore = create<ImageWorkspaceState>((set, get) =>
     return workspace;
   };
 
+  const waitForGenerationTask = async (
+    workspaceId: string,
+    quoteId: string,
+  ): Promise<DesignGenerationTask[]> => {
+    for (let attempt = 0; attempt < GENERATION_TASK_SYNC_ATTEMPTS; attempt += 1) {
+      if (get().activeWorkspaceId !== workspaceId) return [];
+      const tasks = await get().refreshTasks().catch(() => []);
+      if (tasks.some((task) => task.quoteId === quoteId)) return tasks;
+      if (attempt < GENERATION_TASK_SYNC_ATTEMPTS - 1) {
+        await wait(GENERATION_TASK_SYNC_DELAY_MS);
+      }
+    }
+    throw new Error('生成请求已确认，但任务列表尚未同步，请点击刷新重试');
+  };
+
   const loadWorkspace = async (workspaceId: string): Promise<void> => {
     const [workspace, tasks] = await Promise.all([
       fetchImageWorkspaceProject(workspaceId),
@@ -251,11 +272,13 @@ export const useImageWorkspaceStore = create<ImageWorkspaceState>((set, get) =>
       const workspace = get().workspace;
       if (!workspace) throw new Error('请先选择设计项目');
       try {
-        return applyWorkspace(await sendImageWorkspaceMessage(
+        const updated = applyWorkspace(await sendImageWorkspaceMessage(
           workspace.workspaceId,
           workspace.turnRevision,
           message,
         ));
+        await get().refreshTasks().catch(() => []);
+        return updated;
       } catch (error) {
         set({ error: handleRequestError(error) });
         return await recoverRevisionConflict(error);
@@ -271,7 +294,7 @@ export const useImageWorkspaceStore = create<ImageWorkspaceState>((set, get) =>
           workspace.turnRevision,
           quoteId,
         ));
-        await get().refreshTasks().catch(() => []);
+        await waitForGenerationTask(workspace.workspaceId, quoteId);
         return updated;
       } catch (error) {
         set({ error: handleRequestError(error) });