fix: memory leaks — cleanup timers on unmount, tighten speech queue, fix isOwner reactivity

- FightViewer: track deferred speechSynthesis.cancel() timer, clear on unmount
- BotProfilePage: change isOwner from ref to computed for reactive login state
- sounds.ts: tighten speech queue depth cap from 3 to 2

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

frontend/src/components/FightViewer.vue

@@ -46,6 +46,7 @@ const canvasContainer = ref<HTMLElement>()
 const logEl = ref<HTMLElement>()
 let scene: FightSceneController | null = null
 const sceneReady = ref(false)
+let cleanupTimerHandle: ReturnType<typeof setTimeout> | null = null
 
 const isReplaying = ref(false)
 const displayHpA = ref(100)
@@ -98,6 +99,8 @@ onUnmounted(() => {
   stopAllAudio()
   sceneReady.value = false
   if (scene) { scene.destroy(); scene = null }
+  if (cleanupTimerHandle) { clearTimeout(cleanupTimerHandle); cleanupTimerHandle = null }
+  if (typeof speechSynthesis !== 'undefined') speechSynthesis.cancel()
 })
 
 async function initScene() {
@@ -398,8 +401,10 @@ async function replay() {
   }
 
   // Kill any remaining queued speech — fight is over
-  setTimeout(() => {
+  if (cleanupTimerHandle) clearTimeout(cleanupTimerHandle)
+  cleanupTimerHandle = setTimeout(() => {
     if (typeof speechSynthesis !== 'undefined') speechSynthesis.cancel()
+    cleanupTimerHandle = null
   }, 3000)
 
   isReplaying.value = false

frontend/src/game/sounds.ts

@@ -290,9 +290,9 @@ function speak(text: string, profileName: string, cancelPrevious: boolean = fals
   if (!voicesLoaded) loadVoices()
   // Chrome bug: speechSynthesis can get stuck. Nudge it.
   if (speechSynthesis.paused) speechSynthesis.resume()
-  // Only flush if queue is getting deep — allows voices to overlap naturally
+  // Flush if queue is getting deep — max 2 queued to prevent buildup
   if (cancelPrevious || (speechSynthesis.pending && speechSynthesis.speaking)) {
-    if (_speechQueueDepth > 3) {
+    if (_speechQueueDepth > 2) {
       speechSynthesis.cancel()
       _speechQueueDepth = 0
     }

frontend/src/pages/BotProfilePage.vue

@@ -76,7 +76,6 @@ const showChoose = ref(false)
 const waitingFighters = ref<QueueEntry[]>([])
 let pollHandle: ReturnType<typeof setInterval> | null = null
 
-const isOwner = ref(false)
 const loadError = ref('')
 const fightError = ref('')
 const showCustomize = ref(false)
@@ -102,6 +101,8 @@ const ARCHETYPES = [
   'broom_man',
 ]
 
+const isOwner = computed(() => isLoggedIn.value && nostrBot.value?.name === botName)
+
 const custForm = reactive({
   archetype: '',
   primaryColor: '#3388cc',
@@ -216,9 +217,6 @@ onMounted(async () => {
   }
   isLoading.value = false
 
-  // Check ownership
-  isOwner.value = isLoggedIn.value && nostrBot.value?.name === botName
-
   // Poll queue for "choose your fight"
   pollQueue()
   pollHandle = setInterval(pollQueue, 4000)