feat: Consolidate note and category loading into a single method for improved efficiency

lib/screens/home_screen.dart

@@ -83,8 +83,51 @@ class _HomeScreenState extends State<HomeScreen> {
   @override
   void initState() {
     super.initState();
-    _loadNotes();
-    _loadCategories();
+    _loadNotesAndCategories();
+  }
+
+  Future<void> _loadNotesAndCategories({bool showLoadingIndicator = true}) async {
+    if (showLoadingIndicator) {
+      setState(() {
+        _isLoading = true;
+      });
+    }
+
+    final Future<List<Note>> notesFuture = _showDeletedNotes
+        ? widget.repository.loadDeletedNotes()
+        : widget.repository.loadNotes();
+    final Future<List<Category>> categoriesFuture =
+        widget.repository.loadCategories();
+
+    List<Note> notesResult = <Note>[];
+    List<Category> categoriesResult = <Category>[];
+
+    try {
+      notesResult = await notesFuture;
+    } catch (e, st) {
+      debugPrint('Failed to load notes: $e\n$st');
+      if (widget.onVaultInvalid != null) {
+        await widget.onVaultInvalid!();
+      }
+      return;
+    }
+
+    try {
+      categoriesResult = await categoriesFuture;
+    } catch (e) {
+      debugPrint('Failed to load categories: $e');
+      categoriesResult = <Category>[];
+    }
+
+    if (!mounted) return;
+
+    setState(() {
+      _notes = notesResult;
+      _categories = categoriesResult;
+      if (showLoadingIndicator) {
+        _isLoading = false;
+      }
+    });
   }
 
   Future<void> _loadCategories() async {
@@ -118,8 +161,8 @@ class _HomeScreenState extends State<HomeScreen> {
   void didUpdateWidget(covariant HomeScreen oldWidget) {
     super.didUpdateWidget(oldWidget);
     if (oldWidget.refreshToken != widget.refreshToken) {
-      _loadNotes();
-      _loadCategories();
+      // Refresh in background without showing the full-screen loader
+      _loadNotesAndCategories(showLoadingIndicator: false);
     }
   }
 
@@ -326,6 +369,7 @@ class _HomeScreenState extends State<HomeScreen> {
         : RefreshIndicator(
             onRefresh: () async {
               await widget.onRequestSync();
+              await _loadNotesAndCategories(showLoadingIndicator: false);
             },
             child: MouseRegion(
               cursor: _isDragging