refactor(app): remove non-idempotent side effects and async loads from QueryaApp.build()

lib/app/app.dart

@@ -1,7 +1,3 @@
-import 'dart:async';
-
-import 'package:querya_desktop/core/actions/querya_command_registry.dart';
-import 'package:querya_desktop/core/extensions/local_extension_registry.dart';
 import 'package:querya_desktop/core/layout/ui_scale.dart';
 import 'package:querya_desktop/core/layout/ui_scale_controller.dart';
 import 'package:querya_desktop/core/motion/querya_motion_controller.dart';
@@ -12,17 +8,13 @@ import 'package:querya_desktop/core/theme/theme_controller.dart';
 import 'package:shadcn_flutter/shadcn_flutter.dart';
 
 import 'app_lifecycle_cleanup.dart';
-import 'app_wiring.dart';
 import '../features/main_screen/main_screen.dart';
 
 class QueryaApp extends StatelessWidget {
   const QueryaApp({super.key});
 
   @override
   Widget build(BuildContext context) {
-    installAppWiring();
-    QueryaCommandRegistry.instance.ensureCoreDefaults();
-    unawaited(LocalExtensionRegistry.instance.load());
     final themeController = ThemeController.instance;
     final uiScaleController = UiScaleController.instance;
     final motionController = QueryaMotionController.instance;

lib/main.dart

@@ -6,7 +6,9 @@ import 'package:flutter/material.dart';
 
 import 'app/app.dart';
 import 'app/app_wiring.dart';
+import 'core/actions/querya_command_registry.dart';
 import 'core/editor/syntax_highlight_service.dart';
+import 'core/extensions/local_extension_registry.dart';
 import 'core/layout/ui_scale_controller.dart';
 import 'core/mcp/mcp_server_controller.dart';
 import 'core/motion/display_refresh_service.dart';
@@ -38,6 +40,8 @@ void main([List<String> args = const []]) async {
       await ThemeController.instance.load();
       await UiScaleController.instance.load();
       await QueryaMotionController.instance.load();
+      QueryaCommandRegistry.instance.ensureCoreDefaults();
+      unawaited(LocalExtensionRegistry.instance.load());
       unawaited(UpdateController.instance.initialize());
       unawaited(cleanupStaleMongoTlsTempFiles());
       unawaited(McpServerController.instance.startIfEnabled());

test/app/querya_app_test.dart

@@ -0,0 +1,20 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:querya_desktop/app/app.dart';
+import 'package:querya_desktop/features/main_screen/querya_window_title_bar.dart';
+
+void main() {
+  // Headless tests have no native bitsdojo symbols.
+  setUp(() => QueryaWindowTitleBar.useNativeWindowChrome = false);
+  tearDown(() => QueryaWindowTitleBar.useNativeWindowChrome = true);
+
+  testWidgets('QueryaApp build is pure and does not crash or throw', (tester) async {
+    await tester.pumpWidget(
+      const QueryaApp(),
+    );
+    // Rebuilding the root widget is idempotent and doesn't trigger side effects
+    await tester.pumpWidget(
+      const QueryaApp(),
+    );
+    expect(find.byType(QueryaApp), findsOneWidget);
+  });
+}