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/views/PlanView.tsx

@@ -787,7 +787,7 @@ export const PlanView: React.FC<PlanViewProps> = ({ targetPath = null }) => {
                         </div>
                       }
                     >
-                      <SimpleMarkdownRenderer content={content} className="typography-markdown-body" />
+                      <SimpleMarkdownRenderer content={content} className="typography-markdown-body" enableFileReferences={false} />
                     </ErrorBoundary>
                   </div>
                 ) : (