fix(playground): prevent 1/2 keys being swallowed by focused sliders

When synth controls (volume, tempo, etc.) have focus after dragging,
keyboard shortcuts 1/2 for thumbs down/up were intercepted by the
range input. Now all four UIs skip shortcut handling when an input,
select, or textarea element has focus.

playground/js/a-app.js

@@ -1176,6 +1176,10 @@ function wireKeyboard() {
       }
     }
 
+    // Don't intercept keys when an input/select has focus
+    const tag = document.activeElement?.tagName;
+    if (tag === 'INPUT' || tag === 'SELECT' || tag === 'TEXTAREA') return;
+
     if (e.key === '1' || e.code === 'Numpad1') {
       e.preventDefault();
       onThumbsDown();

playground/js/app.js

@@ -432,6 +432,8 @@ function onKeyDown(e) {
   }
 
   if (!followMode || e.repeat) return;
+  const tag = e.target.tagName;
+  if (tag === 'INPUT' || tag === 'SELECT' || tag === 'TEXTAREA') return;
   if (e.key === '1' || e.code === 'Numpad1') {
     e.preventDefault();
     onThumbsDown();

playground/js/b-app.js

@@ -1130,13 +1130,13 @@ function clearState() {
 // ============================
 window.addEventListener('keydown', (e) => {
   if (e.repeat) return;
+  const tag = e.target.tagName;
+  if (tag === 'INPUT' || tag === 'SELECT' || tag === 'TEXTAREA') return;
   // RL shortcuts: 1=negative, 2=positive
   if (e.key === '1' || e.code === 'Numpad1') { e.preventDefault(); onThumbsDown(); }
   if (e.key === '2' || e.code === 'Numpad2') { e.preventDefault(); onThumbsUp(); }
   // Follow mode toggle: f
   if (e.key === 'f' || e.key === 'F') {
-    // Don't toggle if user is typing in an input
-    if (e.target.tagName === 'INPUT' || e.target.tagName === 'TEXTAREA' || e.target.tagName === 'SELECT') return;
     e.preventDefault();
     toggleFollowMode();
   }

playground/js/c-app.js

@@ -268,6 +268,8 @@ function init() {
   // Keyboard shortcuts for RL (work in all phases)
   window.addEventListener('keydown', (e) => {
     if (e.repeat) return;
+    const tag = e.target.tagName;
+    if (tag === 'INPUT' || tag === 'SELECT' || tag === 'TEXTAREA') return;
     if (e.key === '1' || e.code === 'Numpad1') {
       e.preventDefault();
       onThumbsDown();