fix: server crash from syntax error in challenges.ts, voice overlap, human fight UX

- Remove stray duplicate template block outside TEMPLATES array that caused parse error preventing server startup (fixes /api/queue/status 500)
- Add choices field to Challenge/PromptEntry interfaces for multiple choice support
- Allow voice lines to overlap naturally instead of cancelling previous speech on every call, with safety flush at depth > 3
- Buffer challenges during cooldown in polling path, auto-submit random choice on timeout
- Block auto-battle for human fights, guard replay-done auto-transition

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/pages/FightPage.vue

@@ -187,7 +187,13 @@ async function pollForChallenge() {
     const data = await res.json()
 
     if (data.pending) {
-      if (roundCooldown.value > 0) return
+      if (roundCooldown.value > 0) {
+        // Buffer for when cooldown ends
+        if (!pendingChallengeData.value || (data.roundNumber && data.roundNumber > (pendingChallengeData.value.data.roundNumber || 0))) {
+          pendingChallengeData.value = { data, receivedAt: Date.now() }
+        }
+        return
+      }
       if (!humanChallenge.value || humanChallenge.value.roundNumber !== data.roundNumber) {
         applyChallenge(data)
       }
@@ -206,7 +212,13 @@ function startTimer() {
     humanTimer.value--
     if (humanTimer.value <= 0) {
       if (timerHandle) clearInterval(timerHandle)
-      if (!humanSubmitted.value) humanSubmitted.value = true
+      if (!humanSubmitted.value) {
+        // Auto-submit a random choice on timeout
+        if (humanChoices.value.length > 0 && !humanAnswer.value.trim()) {
+          humanAnswer.value = humanChoices.value[Math.floor(Math.random() * humanChoices.value.length)]
+        }
+        submitHumanAnswer()
+      }
     }
   }, 1000)
 }
@@ -618,14 +630,14 @@ async function matchmake(botId: string) {
 
 function onReplayDone() {
   replayDone.value = true
-  if (autoBattle.value && myBotId.value) {
+  if (autoBattle.value && myBotId.value && !isHumanFight.value) {
     autoBattleCount.value++
     fightAgain(myBotId.value)
   }
 }
 
 function startAutoBattle() {
-  if (!myBotId.value) return
+  if (!myBotId.value || isHumanFight.value) return
   autoBattle.value = true
   autoBattleCount.value = 0
   fightAgain(myBotId.value)