feat: integrate Flutter Quill for rich text editing and update note handling

- Added Flutter Quill package for rich text editing capabilities.
- Refactored note body handling to support Quill's Document format.
- Updated note editor screen to use QuillEditor and QuillController.
- Enhanced note search functionality to convert note body to plain text.
- Modified note card display to show plain text from note body.
- Updated localization support for Quill in the app.
- Registered necessary plugins for URL launching and file selection on all platforms.
- Updated app icons and other assets for consistency across platforms.
- Updated pubspec.yaml and pubspec.lock to include new dependencies and versions.

lib/app.dart

@@ -3,6 +3,8 @@ import 'dart:io';
 
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
+import 'package:flutter_localizations/flutter_localizations.dart';
+import 'package:flutter_quill/flutter_quill.dart';
 import 'package:notas/data/app_database.dart';
 import 'package:notas/data/api_client.dart';
 import 'package:notas/data/local_vault_service.dart';
@@ -1094,6 +1096,12 @@ class _NotesAppState extends State<NotesApp>
       title: 'Mis Notas',
       debugShowCheckedModeBanner: false,
       scaffoldMessengerKey: _scaffoldMessengerKey,
+      localizationsDelegates: const <LocalizationsDelegate<dynamic>>[
+        GlobalMaterialLocalizations.delegate,
+        GlobalWidgetsLocalizations.delegate,
+        GlobalCupertinoLocalizations.delegate,
+        FlutterQuillLocalizations.delegate,
+      ],
       theme:
           _lightTheme ??
           AppTheme.theme(