feat: flutter ui integration

ui/flutter/lib/util/mac_secure_util.dart

@@ -0,0 +1,32 @@
+import 'dart:io';
+
+import 'package:macos_secure_bookmarks/macos_secure_bookmarks.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+class MacSecureUtil {
+  static const _bookmarkKey = "bookmark:";
+
+  static Future<void> saveBookmark(String dir) async {
+    if (!Platform.isMacOS) {
+      return;
+    }
+    final secureBookmarks = SecureBookmarks();
+    final bookmark = await secureBookmarks.bookmark(Directory(dir));
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setString(_bookmarkKey + dir, bookmark);
+  }
+
+  static Future<void> loadBookmark() async {
+    if (!Platform.isMacOS) {
+      return;
+    }
+    final prefs = await SharedPreferences.getInstance();
+    final keys = prefs.getKeys();
+    final secureBookmarks = SecureBookmarks();
+    keys.where((k) => k.startsWith(_bookmarkKey)).forEach((k) async {
+      final resolvedFile = await secureBookmarks
+          .resolveBookmark(prefs.getString(k)!, isDirectory: true);
+      await secureBookmarks.startAccessingSecurityScopedResource(resolvedFile);
+    });
+  }
+}