fix: consistent timer unit (seconds) in ChoiceSystem first onUpdate

The first onUpdate call used raw milliseconds (e.g. total: 10000),
while subsequent ticks used seconds (total: 10). This caused the
progress bar to jump on the first interval tick.

engine/systems/ChoiceSystem.ts

@@ -25,13 +25,14 @@ export class ChoiceSystem {
 
     const maxLimit = Math.max(...timed.map((c) => c.timeLimit!))
 
+    const maxLimitSec = maxLimit / 1000
+
     this.timeLimit = maxLimit
     this.elapsed = 0
     this.onUpdate = onUpdate
     this.onTimeout = onTimeout
 
-    const state: ChoiceTimerState = { total: maxLimit, remaining: maxLimit }
-    this.onUpdate(state)
+    this.onUpdate({ total: maxLimitSec, remaining: maxLimitSec })
 
     this.timerId = setInterval(() => {
       this.elapsed += this.tickMs