opt: whisper exception handle

lib/pages/whisper/view.dart

@@ -44,7 +44,24 @@ class _WhisperPageState extends State<WhisperPage> {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(title: const Text('消息')),
+      appBar: AppBar(
+        title: const Text('消息'),
+        actions: [
+          IconButton(
+            icon: Icon(Icons.open_in_browser_rounded,
+                color: Theme.of(context).colorScheme.primary),
+            tooltip: '用浏览器打开',
+            onPressed: () {
+              Get.toNamed('/webview', parameters: {
+                'url': 'https://message.bilibili.com',
+                'type': 'whisper',
+                'pageTitle': '消息中心',
+              });
+            },
+          ),
+          const SizedBox(width: 12)
+        ],
+      ),
       body: RefreshIndicator(
         onRefresh: () async {
           _whisperController.unread();