feat: support flutter web

ui/flutter/lib/util/mac_secure_util.dart

@@ -3,11 +3,13 @@ import 'dart:io';
 import 'package:macos_secure_bookmarks/macos_secure_bookmarks.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
+import 'util.dart';
+
 class MacSecureUtil {
   static const _bookmarkKey = "bookmark:";
 
   static Future<void> saveBookmark(String dir) async {
-    if (!Platform.isMacOS) {
+    if (!Util.isMacos()) {
       return;
     }
     final secureBookmarks = SecureBookmarks();
@@ -17,7 +19,7 @@ class MacSecureUtil {
   }
 
   static Future<void> loadBookmark() async {
-    if (!Platform.isMacOS) {
+    if (!Util.isMacos()) {
       return;
     }
     final prefs = await SharedPreferences.getInstance();

ui/flutter/lib/util/util.dart

@@ -1,5 +1,7 @@
 import 'dart:io';
 
+import 'package:flutter/foundation.dart';
+
 class Util {
   static String fmtByte(int byte) {
     if (byte < 1024) {
@@ -21,11 +23,29 @@ class Util {
     return (dir == "" ? "" : "$dir/") + buildPath(path, name);
   }
 
+  static isWeb() {
+    return kIsWeb;
+  }
+
+  static isAndroid() {
+    return !kIsWeb && Platform.isAndroid;
+  }
+
+  static isMacos() {
+    return !kIsWeb && Platform.isMacOS;
+  }
+
   static isDesktop() {
+    if (kIsWeb) {
+      return false;
+    }
     return Platform.isWindows || Platform.isLinux || Platform.isMacOS;
   }
 
   static isUnix() {
+    if (kIsWeb) {
+      return false;
+    }
     return !Platform.isWindows;
   }
 }