优化代码结构，修复部分bug

lib/pages/game/game_detail_page.dart

@@ -960,7 +960,7 @@ class _GameDetailPageState extends State<GameDetailPage> {
             onPressed: () async {
               final provider = context.read<AppProvider>();
               await provider.removeGame(widget.game.id);
-              if (!mounted) return;
+              if (!mounted || !context.mounted) return;
               if (widget.embedded) {
                 Navigator.of(context).pop();
                 provider.selectGame(null);
@@ -969,7 +969,7 @@ class _GameDetailPageState extends State<GameDetailPage> {
                 navigator.pop();
                 navigator.pop();
               }
-              if (mounted) {
+              if (mounted && context.mounted) {
                 ToastUtil.show(context, '已删除');
               }
             },

lib/pages/game/game_form_page.dart

@@ -8,6 +8,7 @@ import 'package:path/path.dart' as p;
 import 'package:provider/provider.dart';
 import '../../providers/app_provider.dart';
 import '../../widgets/fade_in_local_image.dart';
+import 'package:uuid/uuid.dart';
 import '../../models/data_models.dart';
 import '../../utils/toast_util.dart';
 import '../../utils/image_path_helper.dart';
@@ -185,6 +186,7 @@ class _GameFormPageState extends State<GameFormPage> {
                           initialValue: _titleController.text,
                           hint: '请输入游戏名称',
                         );
+                        if (!mounted) return;
                         if (result != null) setState(() => _titleController.text = result);
                       },
                     ),
@@ -210,6 +212,7 @@ class _GameFormPageState extends State<GameFormPage> {
                           initialSelected: _platforms,
                           hint: '如：PS5、Switch、Steam',
                         );
+                        if (!mounted) return;
                         if (result != null) setState(() => _platforms = result);
                       },
                     ),
@@ -235,6 +238,7 @@ class _GameFormPageState extends State<GameFormPage> {
                           initialSelected: _versions,
                           hint: '如：标准版、豪华版',
                         );
+                        if (!mounted) return;
                         if (result != null) setState(() => _versions = result);
                       },
                     ),
@@ -269,6 +273,7 @@ class _GameFormPageState extends State<GameFormPage> {
                           initialSelected: _genres,
                           hint: '如：RPG、动作、冒险',
                         );
+                        if (!mounted) return;
                         if (result != null) setState(() => _genres = result);
                       },
                     ),
@@ -305,6 +310,7 @@ class _GameFormPageState extends State<GameFormPage> {
                           initialSelected: _purchasePlatforms,
                           hint: '如：Steam、eShop、PlayStation Store',
                         );
+                        if (!mounted) return;
                         if (result != null) setState(() => _purchasePlatforms = result);
                       },
                     ),
@@ -344,6 +350,7 @@ class _GameFormPageState extends State<GameFormPage> {
                           hint: '如：298元、49.99美元',
                           keyboardType: TextInputType.text,
                         );
+                        if (!mounted) return;
                         if (result != null) setState(() => _purchasePriceController.text = result);
                       },
                     ),
@@ -496,6 +503,7 @@ class _GameFormPageState extends State<GameFormPage> {
         builder: (_) => _SummaryEditorPage(initialText: _summaryController.text),
       ),
     );
+    if (!mounted) return;
     if (result != null) {
       setState(() => _summaryController.text = result);
     }
@@ -753,10 +761,11 @@ class _GameFormPageState extends State<GameFormPage> {
 
       if (pickedFile != null) {
         final fileName = 'cover_${DateTime.now().millisecondsSinceEpoch}.jpg';
-        final gameId = widget.game?.id ?? DateTime.now().millisecondsSinceEpoch.toString();
+        final gameId = widget.game?.id ?? const Uuid().v4();
         final targetPath = await ImagePathHelper.instance.getGameCoverPath(gameId, fileName);
         await ImagePathHelper.instance.ensureDirExists(p.dirname(targetPath));
         await File(pickedFile.path).copy(targetPath);
+        if (!mounted) return;
         setState(() => _coverPath = targetPath);
       }
     } catch (e) {
@@ -919,11 +928,12 @@ class _GameFormPageState extends State<GameFormPage> {
       if (response.bodyBytes.length > 10 * 1024 * 1024) throw Exception('图片太大');
 
       final fileName = 'cover_${DateTime.now().millisecondsSinceEpoch}.jpg';
-      final gameId = widget.game?.id ?? DateTime.now().millisecondsSinceEpoch.toString();
+      final gameId = widget.game?.id ?? const Uuid().v4();
       final targetPath = await ImagePathHelper.instance.getGameCoverPath(gameId, fileName);
       await ImagePathHelper.instance.ensureDirExists(p.dirname(targetPath));
       await File(targetPath).writeAsBytes(response.bodyBytes);
 
+      if (!mounted) return;
       setState(() => _coverPath = targetPath);
     } catch (e) {
       debugPrint('封面下载失败: $e');
@@ -1009,6 +1019,7 @@ class _GameFormPageState extends State<GameFormPage> {
       lastDate: DateTime.now().add(const Duration(days: 365 * 5)),
       builder: (context, child) => child!,
     );
+    if (!mounted) return;
     if (picked != null) {
       setState(() => _purchaseDate = picked);
     }
@@ -1073,7 +1084,7 @@ class _GameFormPageState extends State<GameFormPage> {
       final now = DateTime.now();
 
       if (widget.game == null) {
-        final newGameId = now.millisecondsSinceEpoch.toString();
+        final newGameId = const Uuid().v4();
         String? finalCoverPath;
         if (_coverPath != null && _coverPath!.isNotEmpty) {
           finalCoverPath = await _moveCoverToNewId(_coverPath!, newGameId);

lib/pages/game/game_review_form_page.dart

@@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 import '../../providers/app_provider.dart';
 import '../../widgets/fade_in_local_image.dart';
+import 'package:uuid/uuid.dart';
 import '../../models/data_models.dart';
 import '../../utils/toast_util.dart';
 
@@ -235,7 +236,7 @@ class _GameReviewFormPageState extends State<GameReviewFormPage> {
       final now = DateTime.now();
       if (widget.review == null) {
         final newReview = GameReview(
-          id: now.millisecondsSinceEpoch.toString(),
+          id: const Uuid().v4(),
           gameId: widget.gameId,
           content: _contentController.text.trim(),
           reviewer: _reviewerController.text.trim(),

lib/pages/game/game_screenshots_page.dart

@@ -7,6 +7,7 @@ import 'package:flutter_staggered_grid_view/flutter_staggered_grid_view.dart';
 import 'package:http/http.dart' as http;
 import '../../providers/app_provider.dart';
 import '../../widgets/fade_in_local_image.dart';
+import 'package:uuid/uuid.dart';
 import '../../models/data_models.dart';
 import '../../utils/toast_util.dart';
 import '../../utils/image_path_helper.dart';
@@ -230,7 +231,7 @@ class _GameScreenshotsPageState extends State<GameScreenshotsPage> {
         await File(pickedFile.path).copy(targetPath);
 
         final newScreenshot = GameScreenshot(
-          id: DateTime.now().millisecondsSinceEpoch.toString(),
+          id: const Uuid().v4(),
           gameId: widget.game.id,
           screenshotPath: targetPath,
           createdAt: DateTime.now(),
@@ -317,7 +318,7 @@ class _GameScreenshotsPageState extends State<GameScreenshotsPage> {
       await File(targetPath).writeAsBytes(response.bodyBytes);
 
       final newScreenshot = GameScreenshot(
-        id: DateTime.now().millisecondsSinceEpoch.toString(),
+        id: const Uuid().v4(),
         gameId: widget.game.id,
         screenshotPath: targetPath,
         createdAt: DateTime.now(),

lib/pages/game/game_tab_page.dart

@@ -446,8 +446,9 @@ class _GameTabPageState extends State<GameTabPage> {
           ElevatedButton(
             onPressed: () async {
               await context.read<AppProvider>().removeGame(game.id);
+              if (!ctx.mounted) return;
               Navigator.pop(ctx);
-              _loadFirst();
+              if (mounted) _loadFirst();
             },
             style: ElevatedButton.styleFrom(backgroundColor: colors.error, foregroundColor: colors.onError, elevation: 0,
                 shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8)),