Fix player UI: sports Highlights pane, scrubber knob, volume knob, description + save-to-playlist

Player/UI fixes:
- Sports (match) Highlights pane: move the toggle click-handler script out of
  the always-false @if(false ...) legacy block so the "Highlights" button opens,
  and emit videoId/isOwner with @json instead of {{ json_encode() }} (escaped
  quotes crashed the data/tab/CRUD block once route keys became hashid strings).
- Progress scrubber knob (video + audio players): center on the track line with
  translate(-50%, -50%); drop the margin-top hack that floated it above the line.
- Music player volume: give the slider wrap height so overflow:hidden no longer
  crops the knob; add a subtle thumb shadow for visibility.
- Music language menu: cap height to available space above the header, sticky
  header, internal scroll; keep controls from auto-hiding while the menu is open.
- Description box: re-check "Show more" overflow at every settle point (fonts,
  images, rAF, tab reopen) so SPA autonext keeps the expand button.

Also bundles pending work: save-to-playlist button component, playlist/channel
views, PlaylistController + NasSyncService, and component-usage tracker updates.

Co-Authored-By: Claude Opus 4.8 <[email protected]>

resources/views/user/channel.blade.php

@@ -1860,18 +1860,7 @@ function openLightbox(src) {
     lb.style.display = 'flex';
 }
 
-/* ── Video hover-preview ── */
-document.querySelectorAll('.yt-video-card').forEach(card => {
-    card.addEventListener('mouseenter', () => {
-        if ('ontouchstart' in window) return;
-        const v = card.querySelector('video');
-        if (v) { v.currentTime = 0; v.volume = 0.1; v.play().catch(()=>{}); v.classList.add('active'); }
-    });
-    card.addEventListener('mouseleave', () => {
-        const v = card.querySelector('video');
-        if (v) { v.pause(); v.currentTime = 0; v.classList.remove('active'); }
-    });
-});
+/* Video hover-preview is wired by the video-card component's inline onmouseenter/onmouseleave (playVideo/stopVideo). Those handlers are audio-aware and keep the thumbnail visible for music tracks. Don't add a second listener here that overrides them. */
 
 /* ── Subscribe toggle ── */
 (function () {