Finished Launcher

Everything is smooth and the UI is perfect

lib/src/util/os.dart

@@ -0,0 +1,14 @@
+import 'dart:io';
+
+const int appBarSize = 2;
+final RegExp _regex = RegExp(r'(?<=\(Build )(.*)(?=\))');
+
+bool get isWin11 {
+  var result = _regex.firstMatch(Platform.operatingSystemVersion)?.group(1);
+  if(result == null){
+    return false;
+  }
+
+  var intBuild = int.tryParse(result);
+  return intBuild != null && intBuild > 22000;
+}