Enhance navigation and structure: integrate SettingsScreen into main app flow, update HomeScreen to open settings, and improve UI elements for better user experience.

lib/screens/settings_screen.dart

@@ -1,14 +1,15 @@
 import 'package:flutter/material.dart';
-import 'package:notas/widgets/app_title_bar.dart';
 import 'package:notas/widgets/search_app_bar.dart';
 
 class SettingsScreen extends StatefulWidget {
   const SettingsScreen({
     super.key,
     required this.onDeleteAllData,
+    required this.onBackToHome,
   });
 
   final Future<void> Function() onDeleteAllData;
+  final VoidCallback onBackToHome;
 
   @override
   State<SettingsScreen> createState() => _SettingsScreenState();
@@ -44,8 +45,6 @@ class _SettingsScreenState extends State<SettingsScreen> {
       ScaffoldMessenger.of(context).showSnackBar(
         const SnackBar(content: Text('Todos los datos locales han sido eliminados.')),
       );
-
-      Navigator.of(context).pop();
     } catch (error) {
       if (!mounted) return;
       ScaffoldMessenger.of(context).showSnackBar(
@@ -77,9 +76,8 @@ class _SettingsScreenState extends State<SettingsScreen> {
         child: SafeArea(
           child: Column(
             children: [
-              const AppTitleBar(),
               SearchAppBar(
-                onLeadingPressed: () => Navigator.of(context).pop(),
+                onLeadingPressed: widget.onBackToHome,
                 leadingIcon: Icons.arrow_back,
                 leadingTooltip: 'Atrás',
                 showSearch: false,