fix：第一轮跑

lib/features/web/presentation/mall_web_host.dart

@@ -0,0 +1,131 @@
+import 'dart:async';
+
+import 'package:flutter/material.dart';
+import 'package:url_launcher/url_launcher.dart';
+import 'package:webview_flutter/webview_flutter.dart';
+
+import '../application/mall_web_host_controller.dart';
+
+/// 常驻在 Tab Shell 上层的商城 H5 宿主。
+class MallWebHost extends StatefulWidget {
+  const MallWebHost({super.key, required this.onExit});
+  final VoidCallback onExit;
+
+  @override
+  State<MallWebHost> createState() => _MallWebHostState();
+}
+
+class _MallWebHostState extends State<MallWebHost> {
+  final _host = MallWebHostController.instance;
+  WebViewController? _controller;
+  String? _loadedUrl;
+  String? _error;
+  int _progress = 0;
+
+  @override
+  void initState() {
+    super.initState();
+    _host.state.addListener(_sync);
+    _host.attachBackHandler(_goBack);
+    _sync();
+  }
+
+  @override
+  void dispose() {
+    _host.state.removeListener(_sync);
+    _host.detachBackHandler();
+    super.dispose();
+  }
+
+  void _sync() {
+    final url = _host.state.value.url;
+    if (url != null && url != _loadedUrl) _load(url);
+    if (mounted) setState(() {});
+  }
+
+  void _load(String rawUrl) {
+    final uri = Uri.tryParse(rawUrl);
+    if (uri == null || (uri.scheme != 'https' && uri.scheme != 'http')) {
+      _error = '商城链接不可用';
+      return;
+    }
+    _error = null;
+    _progress = 0;
+    _loadedUrl = rawUrl;
+    _controller ??= WebViewController()
+      ..setJavaScriptMode(JavaScriptMode.unrestricted)
+      ..addJavaScriptChannel(
+        'JinzhiBridge',
+        onMessageReceived: (message) {
+          if (message.message == 'close') widget.onExit();
+        },
+      )
+      ..setNavigationDelegate(
+        NavigationDelegate(
+          onProgress: (value) {
+            if (mounted) setState(() => _progress = value);
+          },
+          onWebResourceError: (error) {
+            if (error.isForMainFrame == false) return;
+            if (mounted) setState(() => _error = error.description);
+          },
+          onNavigationRequest: (request) async {
+            final target = Uri.tryParse(request.url);
+            if (target == null ||
+                target.scheme == 'http' ||
+                target.scheme == 'https') {
+              return NavigationDecision.navigate;
+            }
+            if (await canLaunchUrl(target)) {
+              await launchUrl(target, mode: LaunchMode.externalApplication);
+            }
+            return NavigationDecision.prevent;
+          },
+        ),
+      );
+    unawaited(_controller!.loadRequest(uri));
+  }
+
+  Future<void> _goBack() async {
+    final controller = _controller;
+    if (controller != null && await controller.canGoBack()) {
+      await controller.goBack();
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final current = _host.state.value;
+    if (current.url == null) return const SizedBox.shrink();
+    return ColoredBox(
+      color: Theme.of(context).scaffoldBackgroundColor,
+      child: Stack(
+        children: [
+          if (_controller != null)
+            Positioned.fill(child: WebViewWidget(controller: _controller!)),
+          if (_error != null)
+            Center(
+              child: Column(
+                mainAxisSize: MainAxisSize.min,
+                children: [
+                  const Icon(Icons.wifi_off_rounded, size: 32),
+                  const SizedBox(height: 12),
+                  const Text('商城加载失败'),
+                  const SizedBox(height: 8),
+                  TextButton(
+                    onPressed: () => _load(_loadedUrl ?? ''),
+                    child: const Text('重新加载'),
+                  ),
+                ],
+              ),
+            ),
+          if (_error == null && _progress < 100)
+            const Align(
+              alignment: Alignment.topCenter,
+              child: LinearProgressIndicator(minHeight: 2),
+            ),
+        ],
+      ),
+    );
+  }
+}

lib/features/web/presentation/web_page.dart

@@ -0,0 +1,123 @@
+import 'package:flutter/material.dart';
+import 'package:go_router/go_router.dart';
+import 'package:url_launcher/url_launcher.dart';
+import 'package:webview_flutter/webview_flutter.dart';
+
+/// Shared HTTPS WebView host. Mall-specific residency and attribution are
+/// layered above this page so ordinary H5 links never receive mall state.
+class AppWebPage extends StatefulWidget {
+  const AppWebPage({
+    super.key,
+    required this.initialUri,
+    this.hideTitle = false,
+    this.allowedHosts = const <String>{},
+  });
+
+  final Uri initialUri;
+  final bool hideTitle;
+  final Set<String> allowedHosts;
+
+  @override
+  State<AppWebPage> createState() => _AppWebPageState();
+}
+
+class _AppWebPageState extends State<AppWebPage> {
+  late final WebViewController _controller;
+  var _progress = 0;
+  String? _error;
+  String _title = '';
+
+  @override
+  void initState() {
+    super.initState();
+    _controller = WebViewController()
+      ..setJavaScriptMode(JavaScriptMode.unrestricted)
+      ..addJavaScriptChannel(
+        'JinzhiBridge',
+        onMessageReceived: (message) {
+          if (message.message == 'close' && mounted) context.pop();
+        },
+      )
+      ..setNavigationDelegate(
+        NavigationDelegate(
+          onProgress: (progress) => setState(() => _progress = progress),
+          onPageFinished: (_) async {
+            final title = await _controller.getTitle();
+            if (mounted && title != null && title.trim().isNotEmpty) {
+              setState(() => _title = title.trim());
+            }
+          },
+          onWebResourceError: (error) {
+            if (error.isForMainFrame == true && mounted) {
+              setState(() => _error = error.description);
+            }
+          },
+          onNavigationRequest: _onNavigationRequest,
+        ),
+      )
+      ..loadRequest(widget.initialUri);
+  }
+
+  NavigationDecision _onNavigationRequest(NavigationRequest request) {
+    final uri = Uri.tryParse(request.url);
+    if (uri == null || !_isHttp(uri)) return NavigationDecision.prevent;
+    if (_allowsInApp(uri)) return NavigationDecision.navigate;
+    launchUrl(uri, mode: LaunchMode.externalApplication);
+    return NavigationDecision.prevent;
+  }
+
+  bool _allowsInApp(Uri uri) {
+    final host = uri.host.toLowerCase();
+    if (host == widget.initialUri.host.toLowerCase()) return true;
+    return widget.allowedHosts.any(
+      (allowed) => host == allowed || host.endsWith('.$allowed'),
+    );
+  }
+
+  bool _isHttp(Uri uri) =>
+      uri.hasAuthority && (uri.scheme == 'https' || uri.scheme == 'http');
+
+  Future<bool> _onPop() async {
+    if (await _controller.canGoBack()) {
+      await _controller.goBack();
+      return false;
+    }
+    return true;
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final body = _error == null
+        ? Stack(
+            children: [
+              WebViewWidget(controller: _controller),
+              if (_progress < 100)
+                LinearProgressIndicator(value: _progress / 100),
+            ],
+          )
+        : Center(
+            child: Padding(
+              padding: const EdgeInsets.all(24),
+              child: Text('页面加载失败\n$_error', textAlign: TextAlign.center),
+            ),
+          );
+    return PopScope(
+      canPop: false,
+      onPopInvokedWithResult: (didPop, _) async {
+        if (!didPop && await _onPop() && context.mounted) context.pop();
+      },
+      child: Scaffold(
+        appBar: widget.hideTitle
+            ? null
+            : AppBar(title: Text(_title.isEmpty ? '加载中' : _title)),
+        body: body,
+      ),
+    );
+  }
+}
+
+Uri? parseSafeWebUri(String? raw) {
+  final uri = Uri.tryParse(raw?.trim() ?? '');
+  if (uri == null || !uri.hasAuthority) return null;
+  return uri.scheme == 'https' || uri.scheme == 'http' ? uri : null;
+}