fix: Scrub lag fix and Volume control for Audiobooks

src/player.js

@@ -213,8 +213,16 @@ export function updateProgress() {
 
 export function seekTo(e) {
   const bar = document.getElementById('progress-bar');
+  if (!bar || !S.audio.duration) return;
   const rect = bar.getBoundingClientRect();
-  S.audio.currentTime = ((e.clientX - rect.left) / rect.width) * S.audio.duration;
+  const pos = Math.max(0, Math.min(1, (e.clientX - rect.left) / rect.width));
+  const fill = document.getElementById('progress-fill');
+  if (fill) { fill.style.transition = 'none'; fill.style.width = (pos * 100) + '%'; }
+  S.audio.currentTime = pos * S.audio.duration;
+  S._scrubbing = true;
+  const done = () => { S._scrubbing = false; requestAnimationFrame(() => { if (fill) fill.style.transition = ''; }); };
+  S.audio.addEventListener('seeked', done, { once: true });
+  setTimeout(done, 1500);
 }
 
 export function initProgressScrub() {
@@ -236,14 +244,15 @@ function _initBarScrub(bar, fill, onMove) {
   function startScrub(pos) { S._scrubbing=true; fill.style.transition='none'; fill.style.width=(pos*100)+'%'; onMove(pos); }
   function moveScrub(pos) { fill.style.width=(pos*100)+'%'; onMove(pos); }
   function endScrub(pos)  {
-    fill.style.transition='';
+    fill.style.width = (pos * 100) + '%'; // pin visual position before re-enabling transition
     if(S.audio.duration) {
       S.audio.currentTime = pos * S.audio.duration;
-      // Keep _scrubbing=true until seek completes so timeupdate can't snap bar back
-      S.audio.addEventListener('seeked', () => { S._scrubbing = false; }, { once: true });
-      setTimeout(() => { S._scrubbing = false; }, 1500); // fallback if seeked never fires
+      const done = () => { S._scrubbing = false; requestAnimationFrame(() => { fill.style.transition = ''; }); };
+      S.audio.addEventListener('seeked', done, { once: true });
+      setTimeout(done, 1500); // fallback if seeked never fires
     } else {
       S._scrubbing = false;
+      fill.style.transition = '';
     }
   }
   bar.addEventListener('touchstart', e => { startScrub(getPos(e.touches[0].clientX)); e.stopPropagation(); }, {passive:true});
@@ -258,7 +267,15 @@ function _initBarScrub(bar, fill, onMove) {
   });
 }
 
-export function setVolume(v) { S.audio.volume = v/100; S.previewAudio.volume = v/100; }
+export function setVolume(v) {
+  const vol = v / 100;
+  S.audio.volume = vol;
+  S.previewAudio.volume = vol;
+  const absAudio = document.getElementById('abs-audio');
+  if (absAudio) absAudio.volume = vol;
+  // sync all volume sliders
+  document.querySelectorAll('.volume-slider-sync').forEach(el => { el.value = v; });
+}
 
 // ─── MEDIA SESSION ───
 export function updateMediaSession(s) {