Match page: cap timeline to round's official end-tick

Some POVs ship trailing post-round spectator footage — e.g. round 14 of
match 2392266 has player 2 at 96s while every other POV is 61.15s and
the round officially ends at freeze_end+61.15s. The timeline was using
max(playerDurations), so the slider stretched to 96s and everyone sat
through 35s of dead air after the round ended.

Now we take min(longestPlayerDuration, (round_end - freeze_end)/64),
defaulting to the longest-player value when round meta is missing.

src/routes/match/[matchId]/[mapName]/+page.svelte

@@ -136,9 +136,24 @@
 		return set;
 	});
 
-	// Uniform timeline: the round runs until the longest-lived player's clip
-	// ends, regardless of which perspective is currently being watched.
-	const roundDuration = $derived(Math.max(0, ...Array.from(playerDurations.values())));
+	// Uniform timeline: cap the round to the official end-tick from
+	// rounds.parquet so anomalous POVs with trailing post-death spectator
+	// footage (occasionally tens of seconds long) don't pad the slider with
+	// dead air. Fall back to the longest player clip when the round meta is
+	// missing or zero.
+	const TICK_RATE = 64;
+	const currentRound = $derived(data.rounds.find((r) => r.round === currentRoundNum));
+	const roundMetaDuration = $derived(
+		currentRound ? (currentRound.round_end_tick - currentRound.freeze_end_tick) / TICK_RATE : 0
+	);
+	const longestPlayerDuration = $derived(
+		Math.max(0, ...Array.from(playerDurations.values()))
+	);
+	const roundDuration = $derived(
+		roundMetaDuration > 0
+			? Math.min(longestPlayerDuration, roundMetaDuration)
+			: longestPlayerDuration
+	);
 	const activePlayerDuration = $derived(playerDurations.get(currentPlayer) ?? 0);
 	const activePlayerOutOfFrame = $derived(
 		activePlayerDuration > 0 && virtualTime >= activePlayerDuration - 0.05