fix: restore missing generateAudio, settingsPanel, chapterListPanel DOM refs removed in cleanup

scraper/internal/server/ui.go

@@ -2510,6 +2510,9 @@ const chapterTmpl = `
   var seekCur         = document.getElementById('seek-cur');
   var seekTot         = document.getElementById('seek-tot');
   var seekTimes       = document.getElementById('seek-times');
+  var settingsPanel   = document.getElementById('settings-panel');
+  var chapterListPanel= document.getElementById('chapter-list-panel');
+  var chapterListBtn  = document.getElementById('chapter-list-btn');
 
   // ── badge helper ──────────────────────────────────────────────────────────
   var BADGE_CLASSES = ['queue-badge-idle','queue-badge-generating','queue-badge-ready',
@@ -2826,6 +2829,36 @@ const chapterTmpl = `
     hideSeek();
   }
 
+  // ── audio generation ─────────────────────────────────────────────────────
+  var currentAudioCtrl = null;
+  var genStartTime     = 0;
+
+  function generateAudio(chapterN, cb) {
+    if (currentAudioCtrl) currentAudioCtrl.abort();
+    var ctrl = new AbortController();
+    currentAudioCtrl = ctrl;
+    genStartTime = Date.now();
+    fetch('/ui/audio/' + SLUG + '/' + chapterN, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ voice: voiceSel.value, speed: getSpeed() }),
+      signal: ctrl.signal
+    })
+    .then(function (res) {
+      if (!res.ok) return res.text().then(function (t) { throw new Error(res.status + ': ' + t); });
+      return res.json();
+    })
+    .then(function (data) {
+      if (stale()) return;
+      if (!data || !data.url) throw new Error('no url in response');
+      cb(data.url);
+    })
+    .catch(function (e) {
+      if (e.name === 'AbortError' || stale()) return;
+      setError(e.message);
+    });
+  }
+
   // ── audio events ──────────────────────────────────────────────────────────
   function onTimeUpdate() {
     if (stale()) { audio.removeEventListener('timeupdate', onTimeUpdate); return; }