Fix SettingsModel equality for defaultAIModel map

Replaces direct comparison of defaultAIModel with mapEquals to ensure deep equality. Updates related tests to include defaultAIModel in test cases for serialization, deserialization, copyWith, and toString.

lib/models/settings_model.dart

@@ -1,4 +1,5 @@
 import 'package:apidash_core/apidash_core.dart';
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:apidash/consts.dart';
 
@@ -213,7 +214,7 @@ class SettingsModel {
         other.workspaceFolderPath == workspaceFolderPath &&
         other.isSSLDisabled == isSSLDisabled &&
         other.isDashBotEnabled == isDashBotEnabled &&
-        other.defaultAIModel == defaultAIModel;
+        mapEquals(other.defaultAIModel, defaultAIModel);
   }
 
   @override

test/models/settings_model_test.dart

@@ -19,6 +19,7 @@ void main() {
     workspaceFolderPath: null,
     isSSLDisabled: true,
     isDashBotEnabled: true,
+    defaultAIModel: {"model": "llama"},
   );
 
   test('Testing toJson()', () {
@@ -38,6 +39,7 @@ void main() {
       "workspaceFolderPath": null,
       "isSSLDisabled": true,
       "isDashBotEnabled": true,
+      "defaultAIModel": {"model": "llama"}
     };
     expect(sm.toJson(), expectedResult);
   });
@@ -59,6 +61,7 @@ void main() {
       "workspaceFolderPath": null,
       "isSSLDisabled": true,
       "isDashBotEnabled": true,
+      "defaultAIModel": {"model": "llama"}
     };
     expect(SettingsModel.fromJson(input), sm);
   });
@@ -77,6 +80,7 @@ void main() {
       historyRetentionPeriod: HistoryRetentionPeriod.oneWeek,
       isSSLDisabled: false,
       isDashBotEnabled: false,
+      defaultAIModel: {"model": "llama"},
     );
     expect(
         sm.copyWith(
@@ -104,7 +108,10 @@ void main() {
   "historyRetentionPeriod": "oneWeek",
   "workspaceFolderPath": null,
   "isSSLDisabled": true,
-  "isDashBotEnabled": true
+  "isDashBotEnabled": true,
+  "defaultAIModel": {
+    "model": "llama"
+  }
 }''';
     expect(sm.toString(), expectedResult);
   });