feat: Add color and icon properties to categories, enhance category management in UI

lib/data/sync_models.dart

@@ -95,6 +95,8 @@ class SyncCategoryPayload {
     required this.encryptedName,
     required this.serverVersion,
     this.isDeleted = false,
+    this.colorValue,
+    this.iconCodePoint,
     required this.updatedAt,
   });
 
@@ -102,6 +104,8 @@ class SyncCategoryPayload {
   final String encryptedName;
   final int serverVersion;
   final bool isDeleted;
+  final int? colorValue;
+  final int? iconCodePoint;
   final DateTime updatedAt;
 
   factory SyncCategoryPayload.fromCategory(
@@ -113,6 +117,8 @@ class SyncCategoryPayload {
       encryptedName: encryptedName,
       serverVersion: category.serverVersion,
       isDeleted: category.isDeleted,
+      colorValue: category.colorValue,
+      iconCodePoint: category.iconCodePoint,
       updatedAt: category.updatedAt,
     );
   }
@@ -123,6 +129,8 @@ class SyncCategoryPayload {
       'encrypted_name': encryptedName,
       'serverVersion': serverVersion,
       'isDeleted': isDeleted,
+      if (colorValue != null) 'colorValue': colorValue!.toSigned(32),
+      if (iconCodePoint != null) 'iconCodePoint': iconCodePoint,
       'updatedAt': updatedAt.toIso8601String(),
     };
   }
@@ -213,12 +221,16 @@ class SyncCategoryResponse {
     required this.encryptedName,
     required this.serverVersion,
     this.isDeleted = false,
+    this.colorValue,
+    this.iconCodePoint,
     required this.updatedAt,
   });
   final String id;
   final String encryptedName;
   final int serverVersion;
   final bool isDeleted;
+  final int? colorValue;
+  final int? iconCodePoint;
   final DateTime updatedAt;
 
   factory SyncCategoryResponse.fromJson(Map<String, dynamic> json) {
@@ -227,6 +239,12 @@ class SyncCategoryResponse {
       encryptedName: _readStringValue(json['encrypted_name']),
       serverVersion: _readIntValue(json['serverVersion']),
       isDeleted: json['isDeleted'] as bool? ?? false,
+      colorValue: json['colorValue'] == null
+          ? null
+          : _readIntValue(json['colorValue']),
+      iconCodePoint: json['iconCodePoint'] == null
+          ? null
+          : _readIntValue(json['iconCodePoint']),
       updatedAt: DateTime.parse(json['updatedAt'] as String),
     );
   }
@@ -237,6 +255,8 @@ class SyncCategoryResponse {
       name: name,
       serverVersion: serverVersion,
       isDeleted: isDeleted,
+      colorValue: colorValue,
+      iconCodePoint: iconCodePoint,
       updatedAt: updatedAt,
     );
   }