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/PlexPlaylistView.tsx

@@ -405,7 +405,7 @@ export default function PlexPlaylistView({
 }: {
   playlistId: number;
   onBack: () => void;
-  onPlay: (itemRk: string, queue: string[]) => void;
+  onPlay: (itemRk: string, queue: string[], fromStart?: boolean) => void;
   /** A title's media-info page, from its menu's "Details". */
   onInfoCard?: (card: PlexCard) => void;
 }) {
@@ -558,6 +558,7 @@ export default function PlexPlaylistView({
   const titleActions = usePlexCardActions(
     {
       onOpen: (c) => onPlay(c.id, order),
+      onRestart: (c) => onPlay(c.id, order, true),
       onInfo: onInfoCard,
       onToggleWatched: (c) =>
         void toggleWatchState(c, t, {