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/components/save-to-playlist-button.blade.php

@@ -0,0 +1,30 @@
+@props([
+    'video',
+    'tag' => 'button',   // 'button' or 'a'
+])
+
+{{-- Canonical "Save to playlist" trigger. Opens the single
+     <x-add-to-playlist-modal/> (included once in layouts/app.blade.php) via
+     openAddToPlaylistModal(numericId). Always passes $video->id, never the
+     route key — the backend validates against videos.id. --}}
+@php
+    $onclick = "openAddToPlaylistModal({$video->id})";
+@endphp
+
+@if($tag === 'a')
+    <a href="javascript:void(0)" {{ $attributes }} onclick="{{ $onclick }}">
+        @if($slot->isEmpty())
+            <i class="bi bi-bookmark"></i> Save to playlist
+        @else
+            {{ $slot }}
+        @endif
+    </a>
+@else
+    <button type="button" {{ $attributes }} onclick="{{ $onclick }}">
+        @if($slot->isEmpty())
+            <i class="bi bi-bookmark"></i> <span>Save to playlist</span>
+        @else
+            {{ $slot }}
+        @endif
+    </button>
+@endif