feat: make scoreboard playoff-aware with banner, bracket, and series drill-down

Turn a regular-season-looking Tuesday into a full playoff experience:

- Playoff banner with round + day + series + elimination counts, gold/silver
  Cup theme toggled by body.playoff-mode
- Series context on each playoff card: round chip, series score, stake badges
  (GAME 7, CLINCHER, PIVOTAL), and one-line blurb
- Game 7s pin to a new Spotlight section above Live
- Playoff OT renders with SUDDEN DEATH badge and pulsing gold border
- Client-side OT notifications via bell button in the banner
- New /series/<id> drill-down with headline, next-game, and game-by-game history
- New /bracket page: 7-column desktop grid, accordion on mobile
- Day N banner count auto-anchors on first playoff scoreboard hit
- SQLite cache for bracket + per-series schedules, stale-on-failure up to 24h

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

app/games.py

@@ -4,6 +4,17 @@ from datetime import datetime, timezone
 from zoneinfo import ZoneInfo
 
 from app.config import DB_PATH
+from app.playoff import (
+    is_pinned,
+    is_playoff_game,
+    is_playoff_ot,
+    ot_label,
+    series_badges,
+    series_blurb,
+    series_id,
+    series_state,
+    series_summary,
+)
 
 EASTERN = ZoneInfo("America/New_York")
 
@@ -100,15 +111,30 @@ def parse_games(scoreboard_data):
                     game, game["awayTeam"]["name"]["default"]
                 ),
                 "Last Period Type": get_game_outcome(game, game_state),
+                "Is Playoff": is_playoff_game(game),
+                "Pinned": is_pinned(game),
+                "Playoff OT": is_playoff_ot(game),
+                "OT Label": ot_label(game.get("periodDescriptor", {}).get("number", 0))
+                if is_playoff_ot(game)
+                else "",
+                "Series Blurb": series_blurb(game) if is_playoff_game(game) else "",
+                "Series Summary": series_summary(game) if is_playoff_game(game) else "",
+                "Series Badges": series_badges(game) if is_playoff_game(game) else [],
+                "Series State": series_state(game.get("seriesStatus", {}))
+                if is_playoff_game(game)
+                else None,
+                "Series ID": series_id(game) if is_playoff_game(game) else None,
             }
         )
 
     def _sort_key(g):
+        # Pinned playoff games (Game 7s) sort first within their state bucket.
+        pin_rank = 0 if g.get("Pinned") else 1
         if g["Game State"] == "PRE":
             # Earliest start first — ISO-8601 sorts correctly as a string
-            return (0, g["Start Time UTC"], 0)
+            return (pin_rank, 0, g["Start Time UTC"], 0)
         # LIVE / FINAL — highest priority first
-        return (1, "", -g["Priority"])
+        return (pin_rank, 1, "", -g["Priority"])
 
     return sorted(extracted_info, key=_sort_key)