fix: mobile menu overlay, speech bubble timing, TTS static file fallback

- Mobile nav menu now overlays content (absolute positioning) instead of
  pushing it down
- Speech bubbles stay visible for minimum 400ms even when TTS resolves
  instantly or fails
- kokoroPlayCached checks audio cache and loads static files even when
  Kokoro worker hasn't loaded — fixes TTS not playing on production
- CORS_ORIGIN env now supports comma-separated origins
- Rename "VIDEO REPLAY" to play icon + "REPLAY"

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

frontend/src/components/FightViewer.vue

@@ -441,8 +441,11 @@ async function _doReplay() {
         scene.showSpeechBubble('a', round.botAResponse.slice(0, 60), 8)
         scene.startTalking('a')
       }
+      // Ensure bubble stays visible for at least 400ms even if TTS resolves instantly
+      const minBubbleA = sleep(400).catch(() => {})
       if (doTTS) await playAnswerNow(props.fight.botA!.name, round.botAResponse)
-      else await sleep(insanityMode.value ? 30 : 400)
+      await minBubbleA
+      if (!doTTS && !insanityMode.value) await sleep(400)
       scene?.stopTalking('a')
       scene?.hideSpeechBubble('a')
     }
@@ -460,8 +463,10 @@ async function _doReplay() {
         scene.showSpeechBubble('b', round.botBResponse.slice(0, 60), 8)
         scene.startTalking('b')
       }
+      const minBubbleB = sleep(400).catch(() => {})
       if (doTTS) await playAnswerNow(props.fight.botB!.name, round.botBResponse)
-      else await sleep(insanityMode.value ? 30 : 400)
+      await minBubbleB
+      if (!doTTS && !insanityMode.value) await sleep(400)
       scene?.stopTalking('b')
       scene?.hideSpeechBubble('b')
     }
@@ -809,7 +814,11 @@ async function _doReplay() {
           :disabled="isReplaying"
           @click="replay"
         >
-          {{ isReplaying ? 'FIGHTING...' : 'VIDEO REPLAY' }}
+          <span v-if="isReplaying">FIGHTING...</span>
+          <span v-else class="flex items-center gap-1.5">
+            <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="currentColor" class="w-3.5 h-3.5"><path d="M8 5v14l11-7z"/></svg>
+            REPLAY
+          </span>
         </button>
         <button
           class="w-8 h-8 flex items-center justify-center border border-border/50 text-text-muted

frontend/src/components/NavBar.vue

@@ -85,7 +85,7 @@ const bottomNav = [
       </button>
     </div>
 
-    <div v-if="isMenuOpen" class="md:hidden border-t border-border px-6 py-4 space-y-4 bg-surface">
+    <div v-if="isMenuOpen" class="md:hidden absolute left-0 right-0 top-full border-t border-border px-6 py-4 space-y-4 bg-surface/95 backdrop-blur-md z-50">
       <RouterLink
         v-for="link in links"
         :key="link.to"

frontend/src/game/audio/voice.ts

@@ -788,10 +788,11 @@ export function playNarrationNow(text: string): Promise<void> {
 async function _playNowCore(text: string, profileName: string, rateOverride?: number): Promise<void> {
   if (getMasterMuted()) return
   const sfxGain = getSfxGain()
-  if (isKokoroReady() && sfxGain) {
+  // Try Kokoro (includes pre-generated static files from cache)
+  if (sfxGain) {
     const profile = voiceProfiles[profileName] || voiceProfiles.announcer
-    await kokoroPlayCached(text, profileName, sfxGain, profile.volume * VOICE_VOLUME_SCALE)
-    return
+    const played = await kokoroPlayCached(text, profileName, sfxGain, profile.volume * VOICE_VOLUME_SCALE)
+    if (played) return
   }
   // Fallback to Web Speech
   return _speakAsyncCore(text, profileName, rateOverride)

frontend/src/game/tts.ts

@@ -510,22 +510,37 @@ export async function kokoroAwaitReady(text: string, profileName: string): Promi
   } catch { return false }
 }
 
-/** Play already-cached audio immediately. Returns playback promise. If not cached, returns resolved. */
-export function kokoroPlayCached(
+/** Play already-cached audio immediately. Returns true if played, false if nothing available. */
+export async function kokoroPlayCached(
   text: string,
   profileName: string,
   dest: AudioNode,
   volume: number = 0.7,
-): Promise<void> {
-  if (!_workerReady) return Promise.resolve()
+): Promise<boolean> {
   const key = _cacheKey(text, profileName)
+  // Check in-memory cache first (includes pre-loaded static files)
   const cached = audioCache.get(key)
   if (cached) {
     cached.lastAccess = Date.now()
-    return _playBuffer(cached.buf, dest, volume)
+    await _playBuffer(cached.buf, dest, volume)
+    return true
   }
-  // Not cached — fall through to generate+play
-  return kokoroSpeakAsync(text, profileName, dest, volume).then(() => {})
+  // Try loading static file on demand if not in cache yet
+  const staticUrl = STATIC_AUDIO[key]
+  if (staticUrl) {
+    const buf = await _loadStaticAudio(staticUrl)
+    if (buf) {
+      audioCache.set(key, { buf, lastAccess: Date.now() })
+      await _playBuffer(buf, dest, volume)
+      return true
+    }
+  }
+  // Try worker generation if available
+  if (_workerReady) {
+    const played = await kokoroSpeakAsync(text, profileName, dest, volume)
+    return played
+  }
+  return false
 }
 
 /** Stop all currently playing kokoro audio */

server/src/app.ts

@@ -34,8 +34,14 @@ app.onError((err, c) => {
 
 app.use('*', logger())
 // CORS: lock down in production, allow all in dev
-const allowedOrigin = process.env.CORS_ORIGIN || '*'
-app.use('/api/*', cors({ origin: allowedOrigin }))
+// Supports comma-separated origins: CORS_ORIGIN=https://a.com,https://b.com
+const corsEnv = process.env.CORS_ORIGIN || '*'
+const allowedOrigins = corsEnv === '*' ? '*' : corsEnv.split(',').map(s => s.trim())
+app.use('/api/*', cors({
+  origin: Array.isArray(allowedOrigins)
+    ? (origin) => allowedOrigins.includes(origin) ? origin : allowedOrigins[0]
+    : allowedOrigins,
+}))
 
 // COOP/COEP headers: required for SharedArrayBuffer (Kokoro TTS WASM threading)
 app.use('*', async (c, next) => {