feat(ui): 新增登录入口与我的页预览

test/auth/auth_k21_test.dart

@@ -82,4 +82,7 @@ Future<void> _pumpAuth(WidgetTester tester) async {
     ),
   );
   await tester.pumpAndSettle();
+  await tester.ensureVisible(find.byKey(const Key('auth-entry-email')));
+  await tester.tap(find.byKey(const Key('auth-entry-email')));
+  await tester.pumpAndSettle();
 }