fix: pin playoff card to its own gameNumber so the header doesn't tick forward after a final

series_state derives game_number from topSeedWins + bottomSeedWins + 1, which becomes the *next* game's number once the API advances seriesStatus post-final. The card for the just-finished game would then read "Game N+1 of 7". Prefer the raw gameNumber on the game payload, falling back to the derived value when it's missing.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

tests/conftest.py

@@ -65,6 +65,7 @@ def make_playoff_game(
     bottom_abbrev="BOS",
     top_is_home=True,
     game_state="LIVE",
+    game_number=None,
     **kwargs,
 ):
     """Convenience wrapper around make_game for playoff fixtures.
@@ -87,7 +88,7 @@ def make_playoff_game(
         home_abbrev, away_abbrev = bottom_abbrev, top_abbrev
         home_name, away_name = "Bottom Seeds", "Top Seeds"
 
-    return make_game(
+    game = make_game(
         game_state=game_state,
         game_type=3,
         series_status=series_status,
@@ -97,6 +98,9 @@ def make_playoff_game(
         away_name=kwargs.pop("away_name", away_name),
         **kwargs,
     )
+    if game_number is not None:
+        game["gameNumber"] = game_number
+    return game
 
 
 LIVE_GAME = make_game()