Fix unstyled playlist cards on /videos?filter=playlists

The base card CSS (.yt-video-card/.yt-video-thumb/.yt-video-info) lived inside
video-card's @once <style> block, so it only emitted when a video card rendered.
Playlist cards reuse those classes, so on playlist-only pages (no video cards)
they rendered completely unstyled — a mess.

Extract the shared card CSS into resources/views/components/partials/card-styles
(kept @once) and @include it from BOTH video-card and playlist-card. Now the CSS
loads whenever either card renders, and @once still dedupes it to one copy on
pages that show both (home feed verified: emitted exactly once).

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

resources/views/components/playlist-card.blade.php

@@ -10,6 +10,11 @@
     $plShuffleUrl = $firstVid ? route('playlists.shuffle', $pl->id) : null;
 @endphp
 
+{{-- Playlist cards reuse .yt-video-card / .yt-video-thumb / .yt-video-info. That
+     CSS lives in this shared partial (also used by video-card) so it loads on
+     pages that show playlists but no videos, e.g. /videos?filter=playlists. --}}
+@include('components.partials.card-styles')
+
 @once
 <style>
 .pl-count-badge {