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/videos/show.blade.php

@@ -552,9 +552,9 @@
                     @endif
 
                     <!-- Save to Playlist Button -->
-                    <button class="yt-action-btn" onclick="openAddToPlaylistModal({{ $video->id }})">
+                    <x-save-to-playlist-button :video="$video" class="yt-action-btn">
                         <i class="bi bi-collection-plus"></i> Save
-                    </button>
+                    </x-save-to-playlist-button>
                     @auth
                         <!-- Quick Watch Later Button -->
                         <form method="POST" action="{{ route('videos.watchLater', $video) }}" class="d-inline"
@@ -905,9 +905,9 @@
             </x-share-button>
         @endif
 
-        <button class="yt-action-btn" onclick="openAddToPlaylistModal({{ $video->id }})" style="flex:1;">
+        <x-save-to-playlist-button :video="$video" class="yt-action-btn" style="flex:1;">
             <i class="bi bi-collection-plus"></i><span>Save</span>
-        </button>
+        </x-save-to-playlist-button>
 
         @auth
             @if (Auth::id() === $video->user_id)