perf: migrate chat rendering to virtua (#1651)

* refactor: migrate chat history virtualization to virtua

* refactor: render loaded chat history directly

* refactor: finish virtua migration

* perf: defer tool body rendering

* perf: queue deferred tool body mounts

* perf: quiet and defer markdown file probes

* perf: defer markdown code highlighting

* perf: stabilize markdown plugin lists

* perf: defer mermaid markdown rendering

* perf: delay markdown file reference annotation

* perf: attach markdown table listeners on demand

* perf: trim markdown render overhead

packages/ui/src/components/chat/message/parts/UserTextPart.tsx

@@ -272,7 +272,8 @@ const UserTextPart: React.FC<UserTextPartProps> = ({ part, messageId, agentMenti
                                 "[&_[data-component='markdown-code']_code]:inline",
                             ]
                         )}
-                        disableLinkSafety 
+                        disableLinkSafety
+                        enableFileReferences={false}
                     />
                 ) : (
                     plainTextContent