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

lib/data/note_encryption.dart

@@ -44,7 +44,7 @@ class NoteEncryption {
   }
 
   /// Desencripta el contenido de una nota usando el master key
-  static Future<String> decryptNote(
+  static Future<String> decrypt(
     String encodedBox,
     String masterKey,
   ) async {

lib/data/note_repository.dart

@@ -305,20 +305,19 @@ class NoteRepository {
     // Apply categories from server
     for (final SyncCategoryResponse catResponse
         in response.changes.categories) {
-      final String plainName = await _plainCategoryName(
-        catResponse.encryptedName,
-        _masterKey,
+      final Category category = await catResponse.toCategory(
+        masterKey: _masterKey,
       );
 
       await _database.upsertCategory(
         CategoriesCompanion(
-          id: Value(catResponse.id),
-          name: Value(plainName),
-          serverVersion: Value(catResponse.serverVersion),
-          isDeleted: Value(catResponse.isDeleted),
-          colorValue: Value<int?>(catResponse.colorValue),
-          iconCodePoint: Value<int?>(catResponse.iconCodePoint),
-          updatedAt: Value(catResponse.updatedAt),
+          id: Value(category.id),
+          name: Value(category.name),
+          serverVersion: Value(category.serverVersion),
+          isDeleted: Value(category.isDeleted),
+          colorValue: Value<int?>(category.colorValue),
+          iconCodePoint: Value<int?>(category.iconCodePoint),
+          updatedAt: Value(category.updatedAt),
           isDirty: const Value(false),
         ),
       );
@@ -479,16 +478,11 @@ Future<List<SyncCategoryPayload>> _encryptCategories(
   final List<SyncCategoryPayload> payloads = [];
 
   for (final DbCategory row in categories) {
-    // The DB stores the plain category name locally.
-    // Use it directly when building the sync payload and preserve
-    // color/icon values from the DB row so they are sent to the server.
-    final String plainName = row.name;
-
     payloads.add(
-      SyncCategoryPayload.fromCategory(
+      await SyncCategoryPayload.fromCategory(
         Category(
           id: row.id,
-          name: plainName,
+          name: row.name,
           serverVersion: row.serverVersion,
           isDeleted: row.isDeleted,
           updatedAt: row.updatedAt,
@@ -496,7 +490,7 @@ Future<List<SyncCategoryPayload>> _encryptCategories(
           colorValue: row.colorValue,
           iconCodePoint: row.iconCodePoint,
         ),
-        encryptedName: await NoteEncryption.encryptNote(plainName, masterKey),
+        masterKey: masterKey,
       ),
     );
   }
@@ -657,11 +651,11 @@ Future<List<Map<String, Object?>>> _decryptNoteBatch(
     String decryptedBody = 'Encrypted';
     if (!isPermanentlyDeleted) {
       try {
-        decryptedTitle = await NoteEncryption.decryptNote(
+        decryptedTitle = await NoteEncryption.decrypt(
           note['encryptedTitle']! as String,
           masterKey,
         );
-        decryptedBody = await NoteEncryption.decryptNote(
+        decryptedBody = await NoteEncryption.decrypt(
           note['encryptedBody']! as String,
           masterKey,
         );
@@ -698,11 +692,3 @@ int _parallelWorkerCount(int itemCount) {
   );
   return math.max(1, math.min(itemCount, cappedByCpu));
 }
-
-Future<String> _plainCategoryName(String storedName, String masterKey) async {
-  try {
-    return await NoteEncryption.decryptNote(storedName, masterKey);
-  } catch (_) {
-    return storedName;
-  }
-}

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,

lib/widgets/category_style.dart

@@ -15,7 +15,7 @@ class CategoryStyle {
   ];
 
   static const List<IconData> icons = <IconData>[
-    Icons.folder,
+    Icons.label_outline_rounded,
     Icons.work,
     Icons.star,
     Icons.home,