feat: 接入 mnote web tree shell 与主页链路整理

- 增加 mnote-web tree/command 支持与前端 MnoteWebTreeShell 集成
- 调整 sidebar、documents、runtime config 与 dev/prod server 配套逻辑
- 补充 homepage/tree shell smoke 脚本并更新 harness 进度文件

wolai-frontend/src/app/(auth)/auth/page.tsx

@@ -31,14 +31,22 @@ export default function AuthPage() {
 
   const currentUser = useQuery(api.users.currentUser, isAuthenticated ? {} : "skip");
 
+  const navigateToHome = useCallback(() => {
+    if (typeof window !== "undefined") {
+      window.location.assign("/");
+      return;
+    }
+    router.replace("/");
+  }, [router]);
+
   useEffect(() => {
     if (isLoading) return;
     if (!isAuthenticated) return;
     if (currentUser === undefined) return;
     if (currentUser && currentUser.name) {
-      router.replace("/");
+      navigateToHome();
     }
-  }, [currentUser, isAuthenticated, isLoading, router]);
+  }, [currentUser, isAuthenticated, isLoading, navigateToHome]);
 
   const [flow, setFlow] = useState<AuthStep>("signIn");
   const [email, setEmail] = useState("");
@@ -70,7 +78,7 @@ export default function AuthPage() {
         if (cancelled) return;
         setPendingUsernameToSave(null);
         setMessage({ type: "success", text: "注册成功！" });
-        router.replace("/");
+        navigateToHome();
       } catch (err: unknown) {
         if (cancelled) return;
         setPendingUsernameToSave(null);
@@ -83,7 +91,7 @@ export default function AuthPage() {
     return () => {
       cancelled = true;
     };
-  }, [currentUser, isAuthenticated, pendingUsernameToSave, router, setMyUsername]);
+  }, [currentUser, isAuthenticated, navigateToHome, pendingUsernameToSave, setMyUsername]);
 
   // 执行登录的核心逻辑
   const performSignIn = useCallback(async (email: string, password: string, flow: AuthStep) => {
@@ -110,8 +118,10 @@ export default function AuthPage() {
           setPendingUsernameToSave(username.trim());
           return;
         }
-        setMessage({ type: "success", text: flow === "signIn" ? "登录成功！" : "注册成功！" });
-        setTimeout(() => router.push("/"), 500);
+        // 说明：登录成功后不要立刻强推 `/`。
+        // Convex Auth cookie 与 currentUser 查询存在短暂同步窗口，过早跳转会把页面推进到根路由空白态。
+        // 这里仅提示“正在同步”，真正跳转交给上面的 useEffect 在登录态稳定后执行。
+        setMessage({ type: "info", text: "登录成功，正在同步登录状态..." });
         return;
       }
 
@@ -187,7 +197,7 @@ export default function AuthPage() {
         setIsSavingUsername(true);
         await setMyUsername({ username: username.trim() });
         setMessage({ type: "success", text: "用户名已保存！" });
-        router.replace("/");
+        navigateToHome();
       } catch (error: any) {
         setMessage({ type: "error", text: getUserFacingErrorMessage(error, "保存失败，请重试") });
       } finally {