fix(club): hide only ACTIVELY-LISTED cards, not the whole trade pile

Keying the club exclusion on the `trade` pile put cards in limbo: the pile can
hold cards with no active listing (a bare "Place on Transfer Market" move, or a
listing later cancelled/sold), and `/tradePile` renders ONLY active listings — so
those cards were invisible in BOTH views. Live prod had 5 trade-pile rows but 1
active listing, so 4 owned cards had no reachable screen (clubPlayers 1966->1961).

Key on the ACTIVE LISTING instead (market store `core_item_id` of `state=active`).
This is self-healing: the moment a listing stops being active the card is back in
the club, with no extra transition to maintain and no need to invent an
"unlisted transfer-list" wire shape (`tradeState` has no verified spelling for
that state, and guessing enum spellings is the documented client-freeze class).

A bare pile move therefore no longer hides a card. That is deliberate: our
`/tradePile` shows only active listings, so hiding on the move alone would
reintroduce the limbo it is meant to prevent.

Verified live: clubPlayers 1961 -> 1965 (exactly the one listed card hidden, the
4 stranded cards recovered); listed wire still absent from /club; counts and
tradePile unchanged. 14 targets green + clippy clean.

openfut-utas-host/tests/host_test.rs

@@ -295,11 +295,11 @@ fn resolver_for(cards: &[(&str, u32)]) -> Arc<Fifa17IdentityResolver> {
     Arc::new(Fifa17IdentityResolver::new(catalog, Arc::new(store)))
 }
 
-/// A card on the transfer list has LEFT the club: `/club` must not show it, and
+/// A card with an ACTIVE listing has LEFT the club: `/club` must not show it, and
 /// pagination must run over the CLUB-VISIBLE set (never Core's unfiltered page,
 /// which would hand back short pages).
 #[test]
-fn club_excludes_transfer_pile_items_and_paginates_the_visible_set() {
+fn club_excludes_listed_items_and_paginates_the_visible_set() {
     let core = Arc::new(FakeCore::new(
         vec![
             item("oc1", "card_a", 86, "CDM", "Argentina", "Premier League", "Chelsea"),
@@ -311,7 +311,7 @@ fn club_excludes_transfer_pile_items_and_paginates_the_visible_set() {
     let resolver = resolver_for(&[("card_a", 20801), ("card_b", 20802), ("card_c", 20803)]);
     let ents = entities();
 
-    // oc2 is listed on the transfer market.
+    // oc2 has an active transfer-market listing.
     let hidden: std::collections::HashSet<String> = ["oc2".to_string()].into_iter().collect();
     let deps = ClubDeps {
         core: core.as_ref(),