feat: 对齐常驻商城与七鱼客服交互

- 同步商城 H5 登录态与原生 token
- 完善商城/原生 tab 切换、动画及返回交互
- 修复七鱼客服键盘避让和状态栏恢复
- 调整开屏跳过按钮与登录入口交互

test/features/web/mall_web_host_controller_test.dart

@@ -0,0 +1,62 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:jinzhi_flutter_app/features/web/application/mall_web_host_controller.dart';
+
+void main() {
+  final host = MallWebHostController.instance;
+
+  setUp(() async => host.clear());
+  tearDown(() async => host.clear());
+
+  test('opens and dismisses the resident full-screen mall host', () {
+    final uri = Uri.parse('https://mall.example.com/?isNight=0');
+
+    host.open(uri);
+    expect(host.state.value.url, uri.toString());
+    expect(host.state.value.visible, isTrue);
+
+    host.dismiss();
+    expect(host.state.value.url, uri.toString());
+    expect(host.state.value.visible, isFalse);
+  });
+
+  test('cache identity ignores attribution but includes theme', () {
+    const first =
+        'https://mall.example.com/path?isNight=0&click_id=a&tracking_id=t1';
+    const second =
+        'https://mall.example.com/path?isNight=0&click_id=b&tracking_id=t2';
+    const dark = 'https://mall.example.com/path?isNight=1&click_id=b';
+
+    expect(
+      MallWebHostController.cacheKeyFor(first),
+      MallWebHostController.cacheKeyFor(second),
+    );
+    expect(
+      MallWebHostController.cacheKeyFor(first),
+      isNot(MallWebHostController.cacheKeyFor(dark)),
+    );
+  });
+
+  test('defers a changed preload while the mall is visible', () {
+    final active = Uri.parse('https://mall.example.com/?isNight=0');
+    final refreshed = Uri.parse('https://mall.example.com/?isNight=1');
+
+    host.open(active);
+    host.preload(refreshed);
+    expect(host.state.value.url, active.toString());
+    expect(host.state.value.visible, isTrue);
+
+    host.dismiss();
+    expect(host.state.value.url, refreshed.toString());
+    expect(host.state.value.visible, isFalse);
+  });
+
+  test('themed URL replaces a stale isNight value', () {
+    final uri = MallWebHostController.uriForTheme(
+      Uri.parse('https://mall.example.com/?from=jinzhi&isNight=1'),
+      isDark: false,
+    );
+
+    expect(uri.queryParameters['from'], 'jinzhi');
+    expect(uri.queryParameters['isNight'], '0');
+  });
+}