Feat: Added history management and paste handling features #3221 (#9266)

### What problem does this PR solve?

feat(agent): Added history management and paste handling features #3221

- Added a PasteHandlerPlugin to handle paste operations, optimizing the
multi-line text pasting experience
- Implemented the AgentHistoryManager class to manage history,
supporting undo and redo functionality
- Integrates history management functionality into the Agent component

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

web/src/pages/agent/index.tsx

@@ -44,6 +44,7 @@ import {
 } from './hooks/use-save-graph';
 import { useShowEmbedModal } from './hooks/use-show-dialog';
 import { UploadAgentDialog } from './upload-agent-dialog';
+import { useAgentHistoryManager } from './use-agent-history-manager';
 import { VersionDialog } from './version-dialog';
 
 function AgentDropdownMenuItem({
@@ -66,8 +67,7 @@ export default function Agent() {
     showModal: showChatDrawer,
   } = useSetModalState();
   const { t } = useTranslation();
-
-  // const openDocument = useOpenDocument();
+  useAgentHistoryManager();
   const {
     handleExportJson,
     handleImportJson,