Control 페이지 UI 구현 및 앱 테마 컬러(Red) 변경 완료

lib/settings_screen.dart

@@ -0,0 +1,15 @@
+import 'package:flutter/material.dart';
+
+class SettingsScreen extends StatelessWidget {
+  const SettingsScreen({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return const Center(
+      child: Text(
+        '5. 설정 (Settings) 페이지',
+        style: TextStyle(color: Colors.white70, fontSize: 20),
+      ),
+    );
+  }
+}