Update app.py

app.py

@@ -278,19 +278,26 @@ HEAD_HTML = """
   }
 
   /* ── Poll the hidden output textarea for results ────────────────── */
-  function pollOutput() {
-    if (isExplaining) {
-      const outTA = document.querySelector('#hidden-output textarea');
-      if (outTA) {
-        const val = outTA.value.trim();
-        if (val && val !== lastSeenOutput) {
+    function watchOutput() {
+      const target = document.querySelector('#hidden-output');
+      if (!target) {
+        setTimeout(watchOutput, 500);
+        return;
+      }
+    
+      const observer = new MutationObserver(() => {
+        const ta = document.querySelector('#hidden-output textarea');
+        if (!ta) return;
+    
+        const val = ta.value.trim();
+        if (isExplaining && val && val !== lastSeenOutput) {
           lastSeenOutput = val;
           applyExplanation(val);
         }
-      }
+      });
+    
+      observer.observe(target, { subtree: true, childList: true });
     }
-    setTimeout(pollOutput, 250);
-  }
 
   function applyExplanation(text) {
     if (placeholder) {
@@ -323,7 +330,7 @@ HEAD_HTML = """
   /* ── Boot ───────────────────────────────────────────────────────── */
   function boot() {
     buildFAB();
-    pollOutput();
+    watchOutput();
   }
 
   if (document.readyState === 'loading') {