initial

lib/services/window_manager_service.dart

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+import 'package:flutter/material.dart';
+import 'package:window_manager/window_manager.dart';
+
+// TODO: rewrite
+class WindowManagerService with WindowListener {
+  Future<void> init() async {
+    await windowManager.ensureInitialized();
+    const windowOptions = WindowOptions(
+      size: Size(868, 768),
+      minimumSize: Size(868, 648),
+      center: true,
+    );
+    await windowManager.waitUntilReadyToShow(windowOptions);
+    windowManager.addListener(this);
+  }
+
+  void dispose() {
+    windowManager.removeListener(this);
+  }
+}