Remove unneeded function

lib/features/sheet_viewer/sheet_viewer_page.dart

@@ -63,9 +63,8 @@ class _SheetViewerPageState extends State<SheetViewerPage>
 
   @override
   void dispose() {
-    // Save current annotations synchronously before disposing
+    // Make sure annotations are saved before exiting
-    // Note: This is fire-and-forget, but Hive operations are fast enough
+    _saveCurrentAnnotations();
-    _saveCurrentAnnotationsSync();
 
     _leftDrawingController.dispose();
     _rightDrawingController.dispose();
@@ -74,27 +73,6 @@ class _SheetViewerPageState extends State<SheetViewerPage>
     super.dispose();
   }
 
-  /// Synchronous version that doesn't await - used in dispose
-  void _saveCurrentAnnotationsSync() {
-    // Save left page (always, since paint mode is single-page only)
-    final leftJson = _leftDrawingController.toJsonString();
-    _storageService.writeAnnotations(
-      widget.sheet.uuid,
-      _currentPage,
-      leftJson.isEmpty || leftJson == '[]' ? null : leftJson,
-    );
-
-    // Save right page if in two-page mode
-    if (widget.config.twoPageMode && _currentPage < _totalPages) {
-      final rightJson = _rightDrawingController.toJsonString();
-      _storageService.writeAnnotations(
-        widget.sheet.uuid,
-        _currentPage + 1,
-        rightJson.isEmpty || rightJson == '[]' ? null : rightJson,
-      );
-    }
-  }
-
   // ---------------------------------------------------------------------------
   // PDF Loading
   // ---------------------------------------------------------------------------