feat(ui): Improve document list refresh mechanism in ClearDocumentsDialog

- Replace direct API call with callback pattern for document list refresh
- Ensure document list updates regardless of operation success/failure
- Improve component decoupling between ClearDocumentsDialog and DocumentManager

lightrag_webui/src/features/DocumentManager.tsx

@@ -386,7 +386,7 @@ export default function DocumentManager() {
             </Button>
           </div>
           <div className="flex-1" />
-          <ClearDocumentsDialog />
+          <ClearDocumentsDialog onDocumentsCleared={fetchDocuments} />
           <UploadDocumentsDialog />
           <PipelineStatusDialog
             open={showPipelineStatus}