fix(plex): Restart only where an episode has a resume point; the Surprise draw is re-read, not redrawn

Show cards carry resumable (ShowState, from the same rollup) so a part-watched
show whose next episode is untouched offers Play, not a Continue and a Restart
that do the same thing; plexStarted is the one rule for cards and menus. The
Surprise rail's key sits under the discover root: whatever refreshes the rails
re-reads the draw (keep=) with its watch state now, kept past the 5-minute gc,
and only the reshuffle deals. Closing the player refreshes the Discover rails.
A show card's play acts on the last click only, and only where it was made.

frontend/src/components/PlexBrowse.tsx

@@ -332,6 +332,7 @@ export default function PlexBrowse() {
   const resolveShow = usePlayShow(
     (id, fromStart) => sub.open({ kind: "player", id, fromStart }),
     (id) => sub.open({ kind: "show", id }),
+    sub.view,
   );
   // A show's card plays the episode it resolves to (usePlayShow); the grid's place is kept first.
   function playShow(card: PlexCard, fromStart: boolean) {