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.dom.test.tsx

@@ -95,6 +95,7 @@ function mount(items: PlexCard[], onPlay = vi.fn()) {
         onBack={() => {}}
         onPlay={onPlay}
         onOpenCard={() => {}}
+        onRestartCard={() => {}}
         onInfoCard={() => {}}
       />
     </QueryClientProvider>,
@@ -192,6 +193,7 @@ describe("PlexCollectionView — after the sort joined the query key", () => {
           onBack={() => {}}
           onPlay={() => {}}
           onOpenCard={() => {}}
+          onRestartCard={() => {}}
           onInfoCard={() => {}}
         />
       </QueryClientProvider>