fix: prevent accidental seek on tap in mobile progress bar

Touch scrubbing now requires ≥8px horizontal drag before committing.
A plain tap on the progress bar is ignored — no unintentional position jump.
Also removed redundant onclick="seekTo()" since _initBarScrub already
handles mouse seeking via mousedown/mousemove/mouseup.

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

index.html

@@ -436,7 +436,7 @@
       </div>
       <div class="progress-bar-wrap">
         <span class="progress-time" id="time-cur">0:00</span>
-        <div class="progress-bar" id="progress-bar" onclick="seekTo(event)"><div class="progress-fill" id="progress-fill"></div></div>
+        <div class="progress-bar" id="progress-bar"><div class="progress-fill" id="progress-fill"></div></div>
         <span class="progress-time right" id="time-total">0:00</span>
       </div>
     </div>

src/player.js

@@ -670,9 +670,24 @@ function _initBarScrub(bar, fill, onMove) {
       fill.style.transition = '';
     }
   }
-  bar.addEventListener('touchstart', e => { startScrub(getPos(e.touches[0].clientX)); e.stopPropagation(); }, {passive:true});
-  bar.addEventListener('touchmove',  e => { if(S._scrubbing) moveScrub(getPos(e.touches[0].clientX)); }, {passive:true});
-  bar.addEventListener('touchend',   e => { if(S._scrubbing) endScrub(getPos(e.changedTouches[0].clientX)); }, {passive:true});
+  // Touch: require ≥8px horizontal drag before committing to scrub.
+  // A plain tap cancels cleanly without seeking.
+  let _touchStartX = 0, _touchMoved = false;
+  bar.addEventListener('touchstart', e => {
+    _touchStartX = e.touches[0].clientX;
+    _touchMoved  = false;
+    e.stopPropagation();
+  }, {passive:true});
+  bar.addEventListener('touchmove', e => {
+    const dx = Math.abs(e.touches[0].clientX - _touchStartX);
+    if (!_touchMoved && dx >= 8) { _touchMoved = true; startScrub(getPos(e.touches[0].clientX)); }
+    if (_touchMoved && S._scrubbing) moveScrub(getPos(e.touches[0].clientX));
+  }, {passive:true});
+  bar.addEventListener('touchend', e => {
+    if (_touchMoved && S._scrubbing) endScrub(getPos(e.changedTouches[0].clientX));
+    else S._scrubbing = false;
+    _touchMoved = false;
+  }, {passive:true});
   bar.addEventListener('mousedown', e => {
     startScrub(getPos(e.clientX)); e.preventDefault();
     const mm = e2 => { if(S._scrubbing) moveScrub(getPos(e2.clientX)); };