Show full playoff bracket, mark series results, harden API decoding

Playoffs:
- List every round played so far (Round 1 → current) instead of only the
  current round, on both macOS menu and iPhone
- Strike through the eliminated team's tricode in a finished series and drop
  the now-redundant "(Final … wins)" tag on completed earlier rounds
- Refetch the bracket when a finished game implies more completed games than
  the cached bracket records, so the series score and round no longer get
  stuck on stale data after cold launch or the NHL bracket endpoint's lag

API robustness:
- Tolerate optional gameCenterLink/startTimeUTC on TBD playoff matchups so the
  scoreboard decode no longer aborts
- Reject API state regressions via a monotonic FUT→…→OFF progression rank so a
  brief glitch can't downgrade a finished game back to "-:-"

README.md

@@ -8,7 +8,7 @@ NHL game situational awareness for macOS (menu bar) and iPhone (single-page app)
 - NHL shield icon in the menu bar with game count
 - Shows games from yesterday, today, and tomorrow grouped by date (configurable)
 - Regular-season rows show league-wide game number (`#547 NYR @ WAS …`)
-- During playoffs, a ROUND section lists every active series with its series score, next game-in-series number, and upcoming tip-off time
+- During playoffs, ROUND sections list every round played so far (Round 1 through the current round) and each round's series with its series score, next game-in-series number, and upcoming tip-off time
 - Game format: `NYR @ WAS 0:2 (FINAL)` / `DAL @ TOR Today @ 7:30 PM`
 - Click a game to open NHL GameCenter; option-click for NHL Videocast
 - Goal scored notifications with scoring team logo