fix(missions): run the full T-10 replay countdown after the tile hold

Replay Ascent schedules liftoff 15 s out: a 5 s tile-preparation hold,
then a 10 s countdown. The hold ended 5 s before liftoff instead of 10,
so the replay sat on the pad for 10 s and the countdown began at T-5.
The hold now ends at T-10, and the countdown runs T-10 to T-1.

src/layers/launches/replay.js

@@ -139,8 +139,10 @@ export function createReplay({ state: layerState, services, parts, source }) {
       0,
       Number(preCountdownDurationSec) || 0,
     );
+    // The hold precedes the whole countdown; ending it at -hold cut T-10 to T-5.
     const preCountdownActive =
-      preCountdownDuration > 0 && realSecondsSinceStart < -preCountdownDuration;
+      preCountdownDuration > 0 &&
+      realSecondsSinceStart < -REPLAY_COUNTDOWN_DURATION_SEC;
     const countdownActive = realSecondsSinceStart < 0 && !preCountdownActive;
     const countdownSeconds = countdownActive
       ? Math.ceil(-realSecondsSinceStart)