Finalize switch from composerName to composer in Sheet model

lib/core/models/change.dart

@@ -100,7 +100,7 @@ class ChangeQueue {
         case ChangeType.sheetNameChange:
           sheet.name = change.value;
         case ChangeType.composerNameChange:
-          sheet.composerName = change.value;
+          sheet.composer = change.value;
         case ChangeType.addTagChange:
           throw UnimplementedError('Tag support not yet implemented');
         case ChangeType.removeTagChange:

lib/features/home/widgets/sheet_list_item.dart

@@ -21,7 +21,7 @@ class SheetListItem extends StatelessWidget {
   Widget build(BuildContext context) {
     return ListTile(
       title: Text(sheet.name),
-      subtitle: Text(sheet.composerName),
+      subtitle: Text(sheet.composer),
       onTap: onTap,
       onLongPress: onLongPress,
     );

lib/features/home/widgets/sheets_list.dart

@@ -80,7 +80,7 @@ class _SheetsListState extends State<SheetsList> {
     setState(() {
       _filteredSheets = widget.sheets.where((sheet) {
         final name = sheet.name.toLowerCase();
-        final composer = sheet.composerName.toLowerCase();
+        final composer = sheet.composer.toLowerCase();
 
         // Each term must appear in either name or composer
         return terms.every(
@@ -122,7 +122,7 @@ class _SheetsListState extends State<SheetsList> {
         ),
       );
     }
-    if (newComposer != sheet.composerName) {
+    if (newComposer != sheet.composer) {
       widget.syncService.queueChange(
         Change(
           type: ChangeType.composerNameChange,
@@ -135,7 +135,7 @@ class _SheetsListState extends State<SheetsList> {
     // Update local state
     setState(() {
       sheet.name = newName;
-      sheet.composerName = newComposer;
+      sheet.composer = newComposer;
     });
 
     // Update cached sheets

lib/shared/widgets/edit_sheet_bottom_sheet.dart

@@ -29,9 +29,7 @@ class _EditSheetBottomSheetState extends State<EditSheetBottomSheet> {
   void initState() {
     super.initState();
     _nameController = TextEditingController(text: widget.sheet.name);
-    _composerController = TextEditingController(
-      text: widget.sheet.composerName,
-    );
+    _composerController = TextEditingController(text: widget.sheet.composer);
   }
 
   @override