fix: add tabindex to seek bar slider role, remove dead handleVideoClick

Co-authored-by: Cursor <cursoragent@cursor.com>

src/lib/components/PlayerControls.svelte

@@ -158,6 +158,7 @@
       onmouseup={handleSeekBarMouseUp}
       onmouseleave={handleSeekBarMouseLeave}
       role="slider"
+      tabindex="0"
       aria-label="Seek"
       aria-valuenow={session.currentTime}
       aria-valuemin={0}

src/lib/components/VideoPlayer.svelte

@@ -119,12 +119,6 @@
     showCaptionSettings = !showCaptionSettings;
   }
 
-  function handleVideoClick() {
-    if (isPlayerMode) {
-      playbackTogglePlayPause();
-    }
-  }
-
   let clickTimer: ReturnType<typeof setTimeout> | null = null;
 
   function handleVideoClickWithDelay(_e: MouseEvent) {