Courtside Manager score keeper page per court; Phase below Courts on the desk; estimated finish on court cards

A per-court signed link from the desk opens a full-screen scoring page with
big +/- buttons, undo, best-of sets, and a confirmed Finalize step; it follows
whatever match is on the court and can never edit a finished result. Public
court cards show the estimated finish time. Release 0.4.0.

Co-Authored-By: Claude Fable 5.1 <[email protected]>
Claude-Session: https://claude.ai/code/session_01MB7nCCAscYsb3zzkT6LHZi

engine/courts.js

@@ -28,7 +28,8 @@ export class CourtEngine {
     this.t.recordResult(matchId, sets, opts);
     if (court) {
       const dur = this.now() - court.startedAt;
-      if (m.status === 'final') this.durations.push(dur);
+      // ignore implausible durations (a match left open over lunch, a clock jump) so the ETA stays useful
+      if (m.status === 'final' && dur >= 2 * MIN && dur <= 90 * MIN) this.durations.push(dur);
       this._freeCourt(court);
     }
     for (const tid of [m.teamA, m.teamB]) this.lastPlayed.set(tid, this.now());