fix: block synthetic mousedown on bottom progress bar from touch taps

noTouch=true now also adds a touchstart preventDefault listener so the
browser does not fire synthetic mousedown/click after a tap, which was
still triggering seeks in the PWA despite touch events being disabled.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/player.js

@@ -711,7 +711,10 @@ function _initBarScrub(bar, fill, onMove, noTouch = false) {
       fill.style.transition = '';
     }
   }
-  if (!noTouch) {
+  if (noTouch) {
+    // Block all touch input (including synthetic mousedown the browser fires after a tap).
+    bar.addEventListener('touchstart', e => { e.preventDefault(); }, { passive: false });
+  } else {
     // Touch: require ≥8px horizontal drag before committing to scrub.
     // A plain tap cancels cleanly without seeking.
     let _touchStartX = 0, _touchMoved = false;