Added some context menus on desktop

lib/widgets/options_modal.dart

@@ -0,0 +1,59 @@
+import 'package:adguard_home_manager/models/menu_option.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_gen/gen_l10n/app_localizations.dart';
+
+import 'package:adguard_home_manager/widgets/custom_list_tile_dialog.dart';
+
+class OptionsModal extends StatelessWidget {
+  final List<MenuOption> options;
+
+  const OptionsModal({
+    Key? key,
+    required this.options,
+  }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return AlertDialog(
+      contentPadding: const EdgeInsets.symmetric(vertical: 16),
+      title: Column(
+        children: [
+          Icon(
+            Icons.more_horiz,
+            size: 24,
+            color: Theme.of(context).listTileTheme.iconColor
+          ),
+          const SizedBox(height: 16),
+          Text(
+            AppLocalizations.of(context)!.options,
+            style: TextStyle(
+              color: Theme.of(context).colorScheme.onSurface
+            ),
+          )
+        ],
+      ),
+      content: Column(
+        mainAxisSize: MainAxisSize.min,
+        children: options.map((opt) => CustomListTileDialog(
+          title: opt.title,
+          icon: opt.icon,
+          onTap: () {
+            Navigator.pop(context);
+            opt.action();
+          },
+        )).toList()
+      ),
+      actions: [
+        Row(
+          mainAxisAlignment: MainAxisAlignment.end,
+          children: [
+            TextButton(
+              onPressed: () => Navigator.pop(context), 
+              child: Text(AppLocalizations.of(context)!.cancel)
+            )
+          ],
+        )
+      ],
+    );
+  }
+}