Optimize automatic updates

lib/presentation/widgets/update_prompt.dart

@@ -1,5 +1,3 @@
-import 'dart:io';
-
 import 'package:flutter/material.dart';
 
 import '../../data/models/app_update_model.dart';
@@ -31,6 +29,8 @@ class _UpdatePromptState extends State<UpdatePrompt> {
 
     final update = await UpdateService.instance.checkForUpdate();
     if (update == null || !mounted) return;
+    final shouldShow = await UpdateService.instance.shouldShowPrompt(update);
+    if (!shouldShow || !mounted) return;
 
     _dialogVisible = true;
     try {
@@ -41,98 +41,55 @@ class _UpdatePromptState extends State<UpdatePrompt> {
   }
 
   Future<void> _showUpdateDialog(AppUpdateInfo update) async {
-    var downloading = false;
-    var progress = 0.0;
-    String? status;
-
     await showDialog<void>(
       context: context,
       barrierDismissible: false,
       builder: (dialogContext) {
-        return StatefulBuilder(
-          builder: (context, setDialogState) {
-            final canDownload =
-                update.downloadUrl != null &&
-                (Platform.isAndroid || Platform.isWindows);
+        Future<void> openDownloadsPage() async {
+          try {
+            await UpdateService.instance.openDownloadsPage();
+            if (dialogContext.mounted) Navigator.of(dialogContext).pop();
+          } catch (e) {
+            ToastHelper.failure('打开下载页面失败: $e');
+          }
+        }
 
-            Future<void> startUpdate() async {
-              if (downloading || !canDownload) return;
+        Future<void> skipPrompt() async {
+          await UpdateService.instance.skipPromptForFiveDays(update);
+          if (dialogContext.mounted) Navigator.of(dialogContext).pop();
+        }
 
-              setDialogState(() {
-                downloading = true;
-                progress = 0;
-                status = '正在下载更新...';
-              });
+        final releaseNotes = (update.description ?? '').trim();
 
-              try {
-                final file = await UpdateService.instance.downloadUpdate(
-                  update,
-                  onProgress: (received, total) {
-                    if (!mounted || total <= 0) return;
-                    setDialogState(() {
-                      progress = received / total;
-                    });
-                  },
-                );
-                if (file == null) return;
-
-                setDialogState(() {
-                  progress = 1;
-                  status = '下载完成，正在打开安装包...';
-                });
-                await UpdateService.instance.openInstaller(file);
-                if (dialogContext.mounted) Navigator.of(dialogContext).pop();
-              } catch (e) {
-                setDialogState(() {
-                  downloading = false;
-                  status = '下载或打开安装包失败';
-                });
-                ToastHelper.failure('更新失败: $e');
-              }
-            }
-
-            return AlertDialog(
-              title: Text('发现新版本 ${update.version}'),
-              content: ConstrainedBox(
-                constraints: const BoxConstraints(maxWidth: 420),
-                child: Column(
-                  mainAxisSize: MainAxisSize.min,
-                  crossAxisAlignment: CrossAxisAlignment.start,
-                  children: [
-                    Text(update.title),
-                    if ((update.description ?? '').isNotEmpty) ...[
-                      const SizedBox(height: 12),
-                      Text(
-                        update.description!,
-                        maxLines: 6,
-                        overflow: TextOverflow.ellipsis,
-                      ),
-                    ],
-                    if (downloading) ...[
-                      const SizedBox(height: 16),
-                      LinearProgressIndicator(
-                        value: progress == 0 ? null : progress,
-                      ),
-                      const SizedBox(height: 8),
-                      Text(status ?? ''),
-                    ],
-                  ],
-                ),
+        return AlertDialog(
+          title: Text('发现新版本 ${update.version}'),
+          content: ConstrainedBox(
+            constraints: const BoxConstraints(maxWidth: 420, maxHeight: 360),
+            child: SingleChildScrollView(
+              child: Column(
+                mainAxisSize: MainAxisSize.min,
+                crossAxisAlignment: CrossAxisAlignment.start,
+                children: [
+                  Text('新版本号：${update.version}'),
+                  const SizedBox(height: 12),
+                  Text(
+                    '版本日志',
+                    style: Theme.of(dialogContext).textTheme.titleSmall,
+                  ),
+                  const SizedBox(height: 6),
+                  Text(releaseNotes.isEmpty ? update.title : releaseNotes),
+                ],
               ),
-              actions: [
-                TextButton(
-                  onPressed: downloading
-                      ? null
-                      : () => Navigator.of(dialogContext).pop(),
-                  child: const Text('稍后'),
-                ),
-                FilledButton(
-                  onPressed: downloading ? null : startUpdate,
-                  child: const Text('立即更新'),
-                ),
-              ],
-            );
-          },
+            ),
+          ),
+          actions: [
+            TextButton(onPressed: skipPrompt, child: const Text('跳过')),
+            TextButton(
+              onPressed: () => Navigator.of(dialogContext).pop(),
+              child: const Text('取消'),
+            ),
+            FilledButton(onPressed: openDownloadsPage, child: const Text('更新')),
+          ],
         );
       },
     );