feat(design): players on touch and the C5 control set, restart on the card (E28 S3f2)

Plex player: a finger's tap on the picture only shows or hides the controls,
the hide timer starts with playback, a double-tap on a side third skips 10 s,
the seek bar is a 2.75rem touch-none hit area with its head shown on touch.
The row is play/pause, Back by position, Next only with a next item, mute,
time, tracks, a fixed ⋯ (settings, media info, stats, shortcuts, download)
and fullscreen; Stop, Restart and the ±10 s buttons are gone.

A started card shows the video card's Continue + Restart pair (one shared
MediaResumeButtons, beside the picture's button), and its menu lists the
restart; the player opens that item at 0 (fromStart). YouTube modal: the
description opens from an ⓘ, the queue arrows sit inside the screen.

frontend/src/components/PlexCollectionView.tsx

@@ -56,12 +56,14 @@ export default function PlexCollectionView({
   onBack,
   onPlay,
   onOpenCard,
+  onRestartCard,
   onInfoCard,
 }: {
   collectionId: string;
   onBack: () => void;
   onPlay: (rk: string, queue: string[]) => void;
   onOpenCard: (card: PlexCard) => void;
+  onRestartCard: (card: PlexCard) => void;
   onInfoCard: (card: PlexCard) => void;
 }) {
   const { t } = useTranslation();
@@ -185,7 +187,12 @@ export default function PlexCollectionView({
       },
     });
   const actions = usePlexCardActions(
-    { onOpen: onOpenCard, onInfo: onInfoCard, onToggleWatched: toggleWatched },
+    {
+      onOpen: onOpenCard,
+      onRestart: onRestartCard,
+      onInfo: onInfoCard,
+      onToggleWatched: toggleWatched,
+    },
     menu.open,
   );
 
@@ -430,6 +437,7 @@ export default function PlexCollectionView({
                     card={c}
                     navIndex={i}
                     onOpen={() => onOpenCard(c)}
+                    onRestart={() => onRestartCard(c)}
                     onToggleWatched={toggleWatched}
                     onAdd={actions.add}
                     menuProps={menu.triggerProps}