Implemented side tree to devices and rountines screen

lib/pages/routines/models/icon_model.dart

@@ -0,0 +1,39 @@
+import 'dart:convert';
+import 'dart:typed_data';
+
+class IconModel {
+  final String uuid;
+  final DateTime createdAt;
+  final DateTime updatedAt;
+  final String iconBase64;
+
+  IconModel({
+    required this.uuid,
+    required this.createdAt,
+    required this.updatedAt,
+    required this.iconBase64,
+  });
+
+  // Method to decode the icon from Base64 and return as Uint8List
+  Uint8List get iconBytes => base64Decode(iconBase64);
+
+  // Factory constructor to create an instance from JSON
+  factory IconModel.fromJson(Map<String, dynamic> json) {
+    return IconModel(
+      uuid: json['uuid'] as String,
+      createdAt: DateTime.parse(json['createdAt'] as String),
+      updatedAt: DateTime.parse(json['updatedAt'] as String),
+      iconBase64: json['icon'] as String,
+    );
+  }
+
+  // Method to convert an instance back to JSON
+  Map<String, dynamic> toJson() {
+    return {
+      'uuid': uuid,
+      'createdAt': createdAt.toIso8601String(),
+      'updatedAt': updatedAt.toIso8601String(),
+      'icon': iconBase64,
+    };
+  }
+}