refactor(ui): Minor refactoring, extract repeating title widget

lib/app/login_screen/login_screen.dart

@@ -1,12 +1,10 @@
-import 'dart:async';
-
 import 'package:flutter/material.dart';
 import 'package:moonwell_launcher/app/home_screen/home_screen.dart';
 import 'package:moonwell_launcher/app/theme/mw_theme.dart';
+import 'package:moonwell_launcher/app/widgets/window_title_bar.dart';
 import 'package:moonwell_launcher/features/launcher/data/launcher_api_client.dart';
 import 'package:moonwell_launcher/features/preferences/domain/repositories/preferences_repository.dart';
 import 'package:moonwell_launcher/service_container.dart';
-import 'package:window_manager/window_manager.dart';
 
 class LoginScreen extends StatefulWidget {
   const LoginScreen({super.key});
@@ -53,9 +51,9 @@ class _LoginScreenState extends State<LoginScreen> {
 
       await Navigator.of(context).pushReplacement(
         PageRouteBuilder(
-          pageBuilder: (_, __, ___) =>
+          pageBuilder: (_, _, _) =>
               HomeScreen(session: session, manifest: manifest),
-          transitionsBuilder: (_, animation, __, child) {
+          transitionsBuilder: (_, animation, _, child) {
             return FadeTransition(opacity: animation, child: child);
           },
           transitionDuration: const Duration(milliseconds: 400),
@@ -83,7 +81,6 @@ class _LoginScreenState extends State<LoginScreen> {
     return Scaffold(
       body: Stack(
         children: [
-          // Background
           Positioned.fill(
             child: Image.asset('assets/background.png', fit: BoxFit.cover),
           ),
@@ -101,23 +98,19 @@ class _LoginScreenState extends State<LoginScreen> {
               ),
             ),
           ),
-          // Title bar
-          Positioned(top: 0, left: 0, right: 0, child: _TitleBar(cs: cs)),
-          // Login form — centered
+          const Positioned(top: 0, left: 0, right: 0, child: WindowTitleBar()),
           Center(
             child: SizedBox(
               width: 340,
               child: Column(
                 mainAxisSize: MainAxisSize.min,
                 children: [
-                  // Logo
                   Image.asset(
                     'assets/logo.png',
                     height: 160,
                     filterQuality: FilterQuality.high,
                   ),
                   const SizedBox(height: 32),
-                  // Card
                   Container(
                     padding: const EdgeInsets.all(28),
                     decoration: BoxDecoration(
@@ -194,70 +187,3 @@ class _LoginScreenState extends State<LoginScreen> {
     );
   }
 }
-
-class _TitleBar extends StatelessWidget {
-  const _TitleBar({required this.cs});
-  final ColorScheme cs;
-
-  @override
-  Widget build(BuildContext context) {
-    return GestureDetector(
-      onPanStart: (_) => windowManager.startDragging(),
-      child: SizedBox(
-        height: 36,
-        child: Row(
-          children: [
-            const Spacer(),
-            _TitleBarButton(
-              icon: Icons.remove,
-              onTap: () => windowManager.minimize(),
-              color: cs.onSurface,
-            ),
-            _TitleBarButton(
-              icon: Icons.crop_square,
-              onTap: () async {
-                if (await windowManager.isMaximized()) {
-                  await windowManager.unmaximize();
-                } else {
-                  await windowManager.maximize();
-                }
-              },
-              color: cs.onSurface,
-            ),
-            _TitleBarButton(
-              icon: Icons.close,
-              onTap: () {
-                unawaited(windowManager.destroy());
-              },
-              color: MWColors.error,
-            ),
-          ],
-        ),
-      ),
-    );
-  }
-}
-
-class _TitleBarButton extends StatelessWidget {
-  const _TitleBarButton({
-    required this.icon,
-    required this.onTap,
-    required this.color,
-  });
-
-  final IconData icon;
-  final VoidCallback onTap;
-  final Color color;
-
-  @override
-  Widget build(BuildContext context) {
-    return InkWell(
-      onTap: onTap,
-      child: SizedBox(
-        width: 40,
-        height: 36,
-        child: Icon(icon, size: 16, color: color.withAlpha(180)),
-      ),
-    );
-  }
-}