style: tighten playoff card copy — uniform Game X of 7 header, leaner blurbs

Top row now always reads "Game N of 7" (round is already shown by the R1/R2/CONF FINAL/CUP FINAL badge). Bottom blurb drops the trailing period on "Series opener" and uses "{Team} lead X-Y" (plural verb, no "— Game N" suffix) when a leader is established.

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

app/playoff.py

@@ -106,9 +106,9 @@ def series_blurb(game):
     if state["is_pivotal"]:
         return f"Series tied 2\u20112 \u2014 pivotal Game {g}."
     if state["is_opener"]:
-        return "Series opener."
+        return "Series opener"
     if leader_name and trailer_name:
-        return f"{leader_name} leads {state['hi']}\u2011{state['lo']} \u2014 Game {g}."
+        return f"{leader_name} lead {state['hi']}\u2011{state['lo']}"
     if state["hi"] == state["lo"]:
         return f"Series even at {state['hi']}\u2011{state['lo']} \u2014 Game {g}."
     return f"Game {g}."
@@ -135,14 +135,9 @@ def series_badges(game):
 
 
 def series_summary(game):
-    """Short series-score line rendered under the blurb, e.g. 'LAK leads 2-1'."""
+    """Short line rendered above the card, e.g. 'Game 2 of 7'."""
     state = series_state(game.get("seriesStatus", {}))
-    if state["is_opener"]:
-        return f"Game 1 of 7 \u00b7 Round {state['round']}"
-    leader_name = _leader_name(game, state)
-    if leader_name:
-        return f"{leader_name} leads {state['hi']}\u2011{state['lo']}"
-    return f"Series tied {state['hi']}\u2011{state['lo']}"
+    return f"Game {state['game_number']} of 7"
 
 
 def is_pinned(game):