perf: debounce rerender calls with queueMicrotask to coalesce rapid updates

index.ts

@@ -124,10 +124,19 @@ export default function piStatusbarExtension(pi: ExtensionAPI) {
     }
   }
 
+  let rerenderScheduled = false;
   function rerender(ctx: any) {
     latestCtx = ctx;
-    requestRender?.();
-    if (ctx.hasUI) ctx.ui.setStatus("pi-statusbar", undefined);
+    if (rerenderScheduled) return;
+    rerenderScheduled = true;
+
+    // Debounce Render - Coalesce rapid rerender calls into a single pass.
+    queueMicrotask(() => {
+      rerenderScheduled = false;
+      requestRender?.();
+      const current = latestCtx;
+      if (current?.hasUI) current.ui.setStatus("pi-statusbar", undefined);
+    });
   }
 
   function installFooter(ctx: any) {