feat: 添加登录页面 URL 检测功能；更新 H5ShellPage 状态管理以支持路由变化

lib/main.dart

@@ -133,11 +133,12 @@ class _H5ShellPageState extends State<H5ShellPage> {
               setState(() => _lineSlots[lineIndex].progress = progress);
             }
           },
-          onPageStarted: (_) {
+          onPageStarted: (url) {
             final slot = _lineSlots[lineIndex];
             slot.shellCoverFallbackTimer?.cancel();
             if (mounted) {
               setState(() {
+                slot.setCurrentUrl(url);
                 slot.loadError = null;
                 slot.progress = 0;
                 slot.showShellCover = true;
@@ -147,6 +148,9 @@ class _H5ShellPageState extends State<H5ShellPage> {
           onPageFinished: (_) {
             unawaited(_handlePageFinished(lineIndex));
           },
+          onUrlChange: (change) {
+            _updateSlotUrl(lineIndex, change.url);
+          },
           onWebResourceError: (error) {
             if (error.isForMainFrame ?? true) {
               final slot = _lineSlots[lineIndex];
@@ -183,6 +187,7 @@ class _H5ShellPageState extends State<H5ShellPage> {
   Future<void> _handlePageFinished(int lineIndex) async {
     await _loadShellBrandingIfNeeded();
     await _syncShellBranding(lineIndex);
+    await _installRouteObserver(lineIndex);
     if (mounted) {
       setState(() {
         _lineSlots[lineIndex].progress = 100;
@@ -196,6 +201,8 @@ class _H5ShellPageState extends State<H5ShellPage> {
       final decoded = jsonDecode(message.message);
       if (decoded is Map && decoded['type'] == 'first-screen-ready') {
         _hideShellCover(lineIndex);
+      } else if (decoded is Map && decoded['type'] == 'route-changed') {
+        _updateSlotUrl(lineIndex, decoded['url']?.toString());
       }
     } catch (_) {
       if (message.message == 'first-screen-ready') {
@@ -260,6 +267,60 @@ class _H5ShellPageState extends State<H5ShellPage> {
     return _runJavaScriptSafely(lineIndex, script);
   }
 
+  Future<void> _installRouteObserver(int lineIndex) {
+    const script = '''
+(() => {
+  try {
+    const notify = () => {
+      try {
+        window.OpenIMShell.postMessage(JSON.stringify({
+          type: 'route-changed',
+          url: window.location.href
+        }));
+      } catch (_) {}
+    };
+
+    if (window.__OPENIM_FLUTTER_ROUTE_OBSERVER__) {
+      window.__OPENIM_FLUTTER_ROUTE_OBSERVER__.notify();
+      return;
+    }
+
+    const originalPushState = window.history.pushState;
+    const originalReplaceState = window.history.replaceState;
+
+    window.history.pushState = function() {
+      const result = originalPushState.apply(this, arguments);
+      notify();
+      return result;
+    };
+
+    window.history.replaceState = function() {
+      const result = originalReplaceState.apply(this, arguments);
+      notify();
+      return result;
+    };
+
+    window.addEventListener('popstate', notify);
+    window.__OPENIM_FLUTTER_ROUTE_OBSERVER__ = { notify };
+    notify();
+  } catch (_) {}
+})();
+''';
+    return _runJavaScriptSafely(lineIndex, script);
+  }
+
+  void _updateSlotUrl(int lineIndex, String? url) {
+    if (url == null || lineIndex < 0 || lineIndex >= _lineSlots.length) {
+      return;
+    }
+
+    final slot = _lineSlots[lineIndex];
+    final changed = slot.setCurrentUrl(url);
+    if (changed && mounted) {
+      setState(() {});
+    }
+  }
+
   Future<void> _ensureLineLoaded(int lineIndex) async {
     final slot = _lineSlots[lineIndex];
     if (slot.hasLoadedInitialRequest) {
@@ -270,6 +331,7 @@ class _H5ShellPageState extends State<H5ShellPage> {
     if (mounted) {
       slot.shellCoverFallbackTimer?.cancel();
       setState(() {
+        slot.setCurrentUrl(slot.line.url);
         slot.loadError = null;
         slot.progress = 0;
         slot.showShellCover = true;
@@ -369,6 +431,7 @@ class _H5ShellPageState extends State<H5ShellPage> {
     final bottomInset = MediaQuery.viewInsetsOf(context).bottom;
     final showLineSwitch = !currentSlot.showShellCover &&
         currentSlot.loadError == null &&
+        currentSlot.isLoginPage &&
         bottomInset == 0;
 
     return PopScope(
@@ -448,8 +511,21 @@ class _H5LineWebViewSlot {
   String? loadError;
   bool showShellCover = true;
   bool hasLoadedInitialRequest = false;
+  bool isLoginPage = false;
+  String? currentUrl;
   Timer? shellCoverFallbackTimer;
 
+  bool setCurrentUrl(String url) {
+    final nextIsLoginPage = AppConfig.isLoginPageUrl(url);
+    if (currentUrl == url && isLoginPage == nextIsLoginPage) {
+      return false;
+    }
+
+    currentUrl = url;
+    isLoginPage = nextIsLoginPage;
+    return true;
+  }
+
   void dispose() {
     shellCoverFallbackTimer?.cancel();
   }