refactor(app): move route screens out of components

Exclude test and spec files from generated barrels so page imports do not load test modules at runtime.

src/app/auth/auth-screen.tsx

@@ -0,0 +1,61 @@
+"use client";
+/**
+ * Auth 屏
+ *
+ * 原始 Dart: lib/ui/auth/auth_screen.dart
+ */
+import { useEffect } from "react";
+import { useRouter } from "next/navigation";
+
+import { MobileShell } from "@/app/_components/core";
+import { useAuthDispatch, useAuthState } from "@/stores/auth/auth-context";
+import { useUserDispatch } from "@/stores/user/user-context";
+import { ROUTES } from "@/router/routes";
+
+import { AuthBackground, AuthPanel } from "./components";
+import styles from "./components/auth-screen.module.css";
+
+export function AuthScreen() {
+  const state = useAuthState();
+  const authDispatch = useAuthDispatch();
+  const userDispatch = useUserDispatch();
+  const router = useRouter();
+
+  // 邮箱登录成功 → 通知 User + 跳转
+  // 用 pendingRedirect flag（不是 useRef transition detection）——
+  // re-mount 时 flag 在 auth context 里持久，区分"刚按了"和"re-visit"准确无误。
+  useEffect(() => {
+    console.log("[auth-screen] useEffect (loginStatus + pendingRedirect)", {
+      pending: state.pendingRedirect,
+      loginStatus: state.loginStatus,
+      willRedirect:
+        state.pendingRedirect && state.loginStatus !== "notLoggedIn",
+    });
+
+    if (state.pendingRedirect && state.loginStatus !== "notLoggedIn") {
+      console.log(
+        "[auth-screen] useEffect → router.replace(/chat) [via pendingRedirect flag]",
+      );
+      authDispatch({ type: "AuthClearPendingRedirect" });
+      userDispatch({ type: "UserInit" });
+      router.replace(ROUTES.chat);
+    }
+  }, [
+    state.loginStatus,
+    state.pendingRedirect,
+    authDispatch,
+    userDispatch,
+    router,
+  ]);
+
+  return (
+    <MobileShell>
+      <div className={styles.wrapper}>
+        <AuthBackground />
+        <div className={styles.content}>
+          <AuthPanel />
+        </div>
+      </div>
+    </MobileShell>
+  );
+}