feat(waf): 规则组新建/编辑改用右侧 Sheet 抽屉

将 RuleGroupDialog 替换为 RuleGroupSheet，使用 shadcn Sheet 侧栏交互，
与站点绑定等操作保持一致；添加规则条目仍保留弹窗。

Wavelet/frontend/app/(main)/waf/page.tsx

@@ -25,7 +25,7 @@ import type {WAFRuleGroup, WAFRuleGroupPayload} from '@/lib/services/openflare';
 import {ProxyRouteService, WafService} from '@/lib/services/openflare';
 
 import {getErrorMessage} from './components/helpers';
-import {RuleGroupDialog} from './components/rule-group-dialog';
+import {RuleGroupSheet} from './components/rule-group-sheet';
 import {RuleGroupsTable} from './components/rule-groups-table';
 import {SiteBindingSheet} from './components/site-binding-sheet';
 
@@ -204,7 +204,7 @@ export default function WafPage() {
         </CardContent>
       </Card>
 
-      <RuleGroupDialog
+      <RuleGroupSheet
         open={editorOpen}
         group={editingGroup}
         ipGroups={ipGroupsQuery.data ?? []}