feat: Refactor note decryption method and update category handling for improved clarity

lib/data/sync_models.dart

@@ -1,3 +1,4 @@
+import 'package:notas/data/note_encryption.dart';
 import 'package:notas/models/note.dart';
 import 'package:notas/models/category.dart';
 import 'dart:convert';
@@ -108,13 +109,13 @@ class SyncCategoryPayload {
   final int? iconCodePoint;
   final DateTime updatedAt;
 
-  factory SyncCategoryPayload.fromCategory(
+  static Future<SyncCategoryPayload> fromCategory(
     Category category, {
-    required String encryptedName,
-  }) {
+    required String masterKey,
+  }) async {
     return SyncCategoryPayload(
       id: category.id,
-      encryptedName: encryptedName,
+      encryptedName: await NoteEncryption.encryptNote(category.name, masterKey),
       serverVersion: category.serverVersion,
       isDeleted: category.isDeleted,
       colorValue: category.colorValue,
@@ -249,10 +250,10 @@ class SyncCategoryResponse {
     );
   }
 
-  Category toCategory({required String name}) {
+  Future<Category> toCategory({required String masterKey}) async {
     return Category(
       id: id,
-      name: name,
+      name: await NoteEncryption.decrypt(encryptedName, masterKey),
       serverVersion: serverVersion,
       isDeleted: isDeleted,
       colorValue: colorValue,