fifa17 store: render cover art on My Packs reward tiles

A reward pack advertised its own id (70-75) as assetId, which is not a client art
asset, so its My Packs tile rendered blank. Reward tiles now carry their tier
store pack as the cover asset (bronze->1, silver->3, gold->5) while `id` stays the
pack own id (the open packId / SERVER_ID); the sentinel keeps its own id so it
stays an inert placeholder.

LIVE-MAPPED on the retail client 2026-08-18 across all three store tabs and two
reward tiles, which corrected an earlier wrong assumption:
  * assetId only gates whether art renders AT ALL (unknown id -> blank tile).
  * WHICH art is drawn comes from packType + packContentInfo.rareQuantity, NOT
    assetId: BRONZE+1rare -> bronze card, BRONZE+3 -> silver, SILVER+1 -> gold,
    SILVER+3 -> silver trio, GOLD+1 -> blue special, GOLD+3 -> red inform.
    Remapping assetId 5->3 and 3->2 left both frames unchanged and only rotated
    the featured player, which proves art is content-driven.

So a reward tile now shows the same cover as the equivalent purchasable pack (a
gold reward shows the blue-special art the 5000-coin Gold Pack shows - EA art
advertises an aspirational card rather than the tier colour). Regression test
reward_tiles_carry_a_renderable_cover_asset added; pack70 golden regenerated.

openfut-adapter-fifa17/src/fut/store_catalog.rs

@@ -170,8 +170,30 @@ pub fn pack_body(p: &PackDef, idx: u64, owned: bool) -> Value {
             _ => 1,
         }
     };
+    // My Packs cover art. LIVE-MAPPED on the retail client 2026-08-18 across all
+    // three store tabs and two reward tiles:
+    //   * `assetId` only gates whether art renders AT ALL. A reward pack's own id
+    //     (70-75) is not a known client asset, so its tile renders BLANK; any valid
+    //     catalogue asset (1-6) makes art appear.
+    //   * WHICH art is drawn comes from `packType` + `packContentInfo.rareQuantity`,
+    //     not from `assetId`: BRONZE+1rare -> bronze card, BRONZE+3 -> silver,
+    //     SILVER+1 -> gold, SILVER+3 -> silver trio, GOLD+1 -> blue special,
+    //     GOLD+3 -> red inform. (Remapping assetId 5->3 and 3->2 left both frames
+    //     unchanged and only rotated the featured player, which proves this.)
+    // So a reward tile automatically shows the same art as the equivalent
+    // purchasable pack; we only need a valid asset, and we use the tier's own store
+    // pack for clarity. `id` stays the pack's own id (the open packId / SERVER_ID).
+    let art_asset: u64 = if owned {
+        match p.category {
+            "gold" => 5,
+            "silver" => 3,
+            _ => 1,
+        }
+    } else {
+        p.id
+    };
     let mut body = json!({
-        "assetId": p.id,
+        "assetId": art_asset,
         "id": p.id,
         "packType": pack_type,
         "description": p.name,
@@ -249,6 +271,9 @@ pub fn sentinel_body(idx: u64) -> Value {
     // The sentinel must stay non-openable (it is only a resolve-without-crash shim
     // for an empty My Packs), so it keeps no purchase path.
     obj.remove("currencies");
+    // Keep the sentinel's own id as its asset: it must render as an inert blank
+    // placeholder, never borrow a real pack's cover.
+    obj.insert("assetId".into(), json!(SENTINEL_PACK_ID));
     body
 }
 
@@ -346,6 +371,28 @@ mod tests {
         assert_eq!(owned_pack_id_for_definition("mystery_pack"), None);
     }
 
+    #[test]
+    fn reward_tiles_carry_a_renderable_cover_asset() {
+        // A reward pack's own id is not a client art asset, so its My Packs tile
+        // renders blank. Each reward tile must therefore carry a valid catalogue
+        // assetId (its tier's store pack) while `id` stays the open packId.
+        for (reward_id, want_asset) in [(71, 1), (72, 3), (73, 5), (74, 5), (75, 5)] {
+            let pack = pack_by_id(reward_id).expect("reward pack in catalogue");
+            let tile = pack_body(pack, 1, true);
+            assert_eq!(tile["id"], reward_id, "open packId stays the pack's own id");
+            assert_eq!(
+                tile["assetId"], want_asset,
+                "reward tile borrows its tier's store-pack cover asset"
+            );
+            assert!(
+                pack_by_id(tile["assetId"].as_u64().unwrap()).is_some_and(|p| !p.owned_only),
+                "the cover asset must be a real purchasable catalogue pack"
+            );
+        }
+        // The sentinel must NOT borrow a real cover — it stays an inert placeholder.
+        assert_eq!(sentinel_body(1)["assetId"], SENTINEL_PACK_ID);
+    }
+
     #[test]
     fn symbolic_reward_pack_renders_as_openable_my_packs_tile() {
         // A granted silver reward pack (resolved to id 72) must appear as an owned

openfut-adapter-fifa17/tests/fixtures/purchasegroup_pack70.json

@@ -199,7 +199,7 @@
       }
     },
     {
-      "assetId": 70,
+      "assetId": 5,
       "id": 70,
       "packType": "GOLD",
       "description": "Reward Gold Pack",