完善PR审查后出现的问题

lib/presentation/pages/settings/settings_page.dart

@@ -167,9 +167,8 @@ class _SettingsPageState extends State<SettingsPage> {
                   subtitle: const Text('gongyun_app'),
                   trailing: const Icon(Icons.open_in_new, size: 16),
                   onTap: () {
-                    launchUrl(
+                    _openExternalUrl(
                       Uri.parse('https://git.saont.net/gongyun/app'),
-                      mode: LaunchMode.externalApplication,
                     );
                   },
                 ),
@@ -179,11 +178,10 @@ class _SettingsPageState extends State<SettingsPage> {
                   subtitle: const Text('cloudreve4_flutter'),
                   trailing: const Icon(Icons.open_in_new, size: 16),
                   onTap: () {
-                    launchUrl(
+                    _openExternalUrl(
                       Uri.parse(
                         'https://github.com/LimoYuan/cloudreve4_flutter',
                       ),
-                      mode: LaunchMode.externalApplication,
                     );
                   },
                 ),
@@ -405,13 +403,16 @@ class _SettingsPageState extends State<SettingsPage> {
     return AnimatedBuilder(
       animation: UpdateService.instance,
       builder: (context, _) {
+        final hasUpdate = UpdateService.instance.hasUpdate;
         return ListTile(
-          leading: const Icon(Icons.tag),
+          leading: Icon(
+            hasUpdate ? Icons.new_releases_outlined : Icons.tag,
+            color: hasUpdate ? Theme.of(context).colorScheme.primary : null,
+          ),
           title: const Text('版本号'),
           subtitle: Text(_appVersion.isEmpty ? '加载中...' : _appVersion),
-          trailing: UpdateService.instance.hasUpdate
-              ? const _BlinkingUpdateDot()
-              : null,
+          onTap: hasUpdate ? () => _openDownloadsPage() : null,
+          trailing: hasUpdate ? const _UpdateAvailableBadge() : null,
         );
       },
     );
@@ -562,6 +563,25 @@ class _SettingsPageState extends State<SettingsPage> {
     }
   }
 
+  Future<void> _openExternalUrl(Uri uri) async {
+    try {
+      final opened = await launchUrl(uri, mode: LaunchMode.externalApplication);
+      if (!opened) {
+        ToastHelper.failure('无法打开链接: $uri');
+      }
+    } catch (e) {
+      ToastHelper.failure('无法打开链接: $e');
+    }
+  }
+
+  Future<void> _openDownloadsPage() async {
+    try {
+      await UpdateService.instance.openDownloadsPage();
+    } catch (e) {
+      ToastHelper.failure('打开下载页面失败: $e');
+    }
+  }
+
   Future<void> _openNetworkTest(BuildContext context) async {
     final agreed = await showDialog<bool>(
       context: context,
@@ -569,13 +589,11 @@ class _SettingsPageState extends State<SettingsPage> {
       builder: (dialogContext) => AlertDialog(
         title: const Text('会话信息授权'),
         content: _NetworkTestConsentText(
-          onOpenPrivacy: () => launchUrl(
+          onOpenPrivacy: () => _openExternalUrl(
             Uri.parse('https://www.gongyun.org/policy/privacy.html'),
-            mode: LaunchMode.externalApplication,
           ),
-          onOpenTerms: () => launchUrl(
+          onOpenTerms: () => _openExternalUrl(
             Uri.parse('https://www.gongyun.org/policy/terms.html'),
-            mode: LaunchMode.externalApplication,
           ),
         ),
         actions: [
@@ -641,14 +659,14 @@ class _SettingsPageState extends State<SettingsPage> {
   }
 }
 
-class _BlinkingUpdateDot extends StatefulWidget {
-  const _BlinkingUpdateDot();
+class _UpdateAvailableBadge extends StatefulWidget {
+  const _UpdateAvailableBadge();
 
   @override
-  State<_BlinkingUpdateDot> createState() => _BlinkingUpdateDotState();
+  State<_UpdateAvailableBadge> createState() => _UpdateAvailableBadgeState();
 }
 
-class _BlinkingUpdateDotState extends State<_BlinkingUpdateDot>
+class _UpdateAvailableBadgeState extends State<_UpdateAvailableBadge>
     with SingleTickerProviderStateMixin {
   late final AnimationController _controller;
   late final Animation<double> _opacity;
@@ -674,15 +692,31 @@ class _BlinkingUpdateDotState extends State<_BlinkingUpdateDot>
 
   @override
   Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
     return FadeTransition(
       opacity: _opacity,
-      child: Container(
-        width: 10,
-        height: 10,
-        decoration: const BoxDecoration(
-          color: Colors.red,
-          shape: BoxShape.circle,
-        ),
+      child: Row(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          Container(
+            width: 8,
+            height: 8,
+            decoration: BoxDecoration(
+              color: colorScheme.error,
+              shape: BoxShape.circle,
+            ),
+          ),
+          const SizedBox(width: 6),
+          Text(
+            '发现新版本',
+            style: TextStyle(
+              color: colorScheme.error,
+              fontWeight: FontWeight.w700,
+            ),
+          ),
+          const SizedBox(width: 4),
+          Icon(Icons.chevron_right, size: 18, color: colorScheme.error),
+        ],
       ),
     );
   }
@@ -734,9 +768,8 @@ class _NetworkTestConsentTextState extends State<_NetworkTestConsentText> {
       fontWeight: FontWeight.w700,
     );
 
-    return RichText(
-      text: TextSpan(
-        style: Theme.of(context).textTheme.bodyMedium,
+    return Text.rich(
+      TextSpan(
         children: [
           const TextSpan(text: '您需同意'),
           TextSpan(
@@ -750,7 +783,10 @@ class _NetworkTestConsentTextState extends State<_NetworkTestConsentText> {
             style: linkStyle,
             recognizer: _termsRecognizer,
           ),
-          const TextSpan(text: '方可进入网络测试页。'),
+          const TextSpan(
+            text:
+                '方可进入网络测试页。测试会访问公云存储服务，并通过第三方服务 ipwho.is 查询当前网络 IP、AS 与运营商信息；如 ipwho.is 不可用，将使用 ipapi.co 作为备用查询。',
+          ),
         ],
       ),
     );