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/PlexDiscover.dom.test.tsx

@@ -98,6 +98,7 @@ describe("PlexDiscover", () => {
       <PlexDiscover
         scope="both"
         onOpenCard={noop}
+        onRestartCard={() => {}}
         onInfoCard={noop}
         onGenre={noop}
         onSeeAllRecent={noop}
@@ -136,6 +137,7 @@ describe("PlexDiscover", () => {
         <PlexDiscover
           scope="both"
           onOpenCard={noop}
+          onRestartCard={() => {}}
           onInfoCard={noop}
           onGenre={noop}
           onSeeAllRecent={noop}
@@ -169,6 +171,7 @@ describe("PlexDiscover", () => {
       <PlexDiscover
         scope="both"
         onOpenCard={noop}
+        onRestartCard={() => {}}
         onInfoCard={noop}
         onGenre={onGenre}
         onSeeAllRecent={noop}
@@ -186,6 +189,7 @@ describe("PlexDiscover", () => {
       <PlexDiscover
         scope="both"
         onOpenCard={noop}
+        onRestartCard={() => {}}
         onInfoCard={noop}
         onGenre={noop}
         onSeeAllRecent={onSeeAllRecent}
@@ -202,6 +206,7 @@ describe("PlexDiscover", () => {
       <PlexDiscover
         scope="both"
         onOpenCard={noop}
+        onRestartCard={() => {}}
         onInfoCard={noop}
         onGenre={noop}
         onSeeAllRecent={noop}
@@ -228,6 +233,7 @@ describe("PlexDiscover", () => {
       <PlexDiscover
         scope="both"
         onOpenCard={noop}
+        onRestartCard={() => {}}
         onInfoCard={noop}
         onGenre={noop}
         onSeeAllRecent={noop}
@@ -252,6 +258,7 @@ describe("PlexDiscover", () => {
       <PlexDiscover
         scope="both"
         onOpenCard={noop}
+        onRestartCard={() => {}}
         onInfoCard={noop}
         onGenre={noop}
         onSeeAllRecent={noop}
@@ -274,6 +281,7 @@ describe("PlexDiscover · keyboard", () => {
       <PlexDiscover
         scope="both"
         onOpenCard={noop}
+        onRestartCard={() => {}}
         onInfoCard={noop}
         onGenre={noop}
         onSeeAllRecent={noop}