Implement offline mode

lib/features/home/widgets/sheets_list.dart

@@ -4,7 +4,7 @@ import 'dart:ui';
 import 'package:flutter/material.dart';
 import 'package:sheetless/core/models/change.dart';
 import 'package:sheetless/core/models/sheet.dart';
-import 'package:sheetless/core/services/storage_service.dart';
+import 'package:sheetless/core/services/sync_service.dart';
 
 import '../../../shared/widgets/edit_sheet_bottom_sheet.dart';
 import 'sheet_list_item.dart';
@@ -19,11 +19,13 @@ import 'sheet_search_bar.dart';
 class SheetsList extends StatefulWidget {
   final List<Sheet> sheets;
   final ValueSetter<Sheet> onSheetSelected;
+  final SyncService syncService;
 
   const SheetsList({
     super.key,
     required this.sheets,
     required this.onSheetSelected,
+    required this.syncService,
   });
 
   @override
@@ -33,7 +35,6 @@ class SheetsList extends StatefulWidget {
 class _SheetsListState extends State<SheetsList> {
   static const _searchDebounceMs = 500;
 
-  final _storageService = StorageService();
   final _searchController = TextEditingController();
   Timer? _debounceTimer;
   late List<Sheet> _filteredSheets;
@@ -111,9 +112,9 @@ class _SheetsListState extends State<SheetsList> {
   }
 
   void _handleSheetEdit(Sheet sheet, String newName, String newComposer) {
-    // Queue changes for server sync
+    // Queue changes for server sync (with timestamp for conflict resolution)
     if (newName != sheet.name) {
-      _storageService.writeChange(
+      widget.syncService.queueChange(
         Change(
           type: ChangeType.sheetNameChange,
           sheetUuid: sheet.uuid,
@@ -122,7 +123,7 @@ class _SheetsListState extends State<SheetsList> {
       );
     }
     if (newComposer != sheet.composerName) {
-      _storageService.writeChange(
+      widget.syncService.queueChange(
         Change(
           type: ChangeType.composerNameChange,
           sheetUuid: sheet.uuid,
@@ -136,6 +137,9 @@ class _SheetsListState extends State<SheetsList> {
       sheet.name = newName;
       sheet.composerName = newComposer;
     });
+
+    // Update cached sheets
+    widget.syncService.updateCachedSheets(widget.sheets);
   }
 
   // ---------------------------------------------------------------------------