fix(home): shelf honours the Plex gate; hero unpins its origin; palette asks for a surprise

- A13: with Plex off, the Home shelf and the hero's comfort tier go YouTube-only like the rails
  beside them (owner's call: hide the tiles). The pins are kept; GET /pins still lists them.
- Reorder deals the listed pins into the slots they already hold, so a partial list (hidden Plex
  pins, a stale tab) no longer puts two pins on one position; repeats are ignored.
- A21: a comfort hero carries `pinned_from`, the shelf entry it was resolved from; its menu acts on
  that pin, so a pinned show's next episode offers "Unpin" instead of creating a second pin.
- B12: the palette's "Meglepetés" asks for the surprise tier (the next press leading with it); the
  rotation carries on from there.
- B13: the surprise token names the history entry it was requested for (minted by setPage's new
  `then`, after the push) and is dropped on any other entry, so a navigation that never mounted
  Home cannot replay it later.

frontend/src/components/AppCommandPalette.tsx

@@ -135,10 +135,11 @@ export default function AppCommandPalette() {
           label: t("palette.actions.surprise"),
           icon: <Sparkles className="w-4 h-4" />,
           keywords: t("home.title"),
-          run: () => {
-            setPage("home");
-            requestSurprise();
-          },
+          // The token is minted on the entry the push made (see lib/homeIntent), and asks for the
+          // SURPRISE tier: the command is labelled "Meglepetés", and the reroll's plain next press
+          // is answered by whichever tier the rotation reaches — for anyone with a shelf, "A
+          // polcodról" under a command that promised a surprise (owner's call, 2026-09-19).
+          run: () => setPage("home", requestSurprise),
         },
         {
           id: "action:shortcuts",