fix: human fight timing, creative timer, TTS reliability, add sweary/vibe narrations

- Fix invisible characters in human mode: init live scene BEFORE starting
  challenge polling so entrance plays before first question appears
- Cap creative writing timer to 10s for multiple choice (just tapping buttons)
- Fix TTS reliability: precache priority phrases (Round 1-7, Fight!, K.O.)
  all at once instead of in slow batches; prevent duplicate precache runs
- Add 10 vibe-coded narrations (~20% chance): "I was vibe coded into existence"
- Add 15 sweary narrations (~30% chance): raw unhinged fight commentary
- Add sweary draw and retro narrations

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

frontend/src/pages/FightPage.vue

@@ -430,6 +430,10 @@ watch(liveFightData, async (val) => {
     await nextTick()
     await nextTick()
     await initLiveScene()
+    // For human fights, start challenge polling after scene is ready
+    if (isHumanFight.value) {
+      startHumanPolling()
+    }
     const queued = pendingSSEEvents.value.splice(0)
     for (const evt of queued) {
       if (evt.type === 'round_end') await handleRoundEnd(evt.data)
@@ -465,8 +469,18 @@ onMounted(async () => {
   if (isLive.value) {
     startPolling({ onFinished: () => stopHumanPolling(), onTimeout: () => stopHumanPolling() })
     if (isHumanFight.value) {
-      startHumanPolling()
       wireSSE()
+      // Init scene first, then start challenge polling — ensures entrance
+      // plays before the first question appears (characters invisible otherwise)
+      if (liveFightData.value) {
+        await nextTick()
+        await nextTick()
+        await initLiveScene()
+      }
+      // Only start polling after scene is ready (or watcher will start it when liveFightData arrives)
+      if (liveSceneReady.value) {
+        startHumanPolling()
+      }
     }
   }
 })