feat: speech overflow fix, 60+ voice profiles, post-fight audio cleanup

- Change speak() default to cancelPrevious=true so voices don't queue endlessly
- Add stopAllAudio() export and wire into FightViewer unmount + post-fight
- Flush speech queue at fight end with delayed cancel for clean cutoff
- Expand from 30 to 60+ voice profiles (robots, accents, game, characters)
- Add speech bubbles showing bot responses during rounds
- Wire announceFinishHim/Fatality/FlawlessVictory/Devastating to not cancel

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

frontend/src/pages/BotProfilePage.vue

@@ -281,14 +281,14 @@ const tierClass = (t: number) => `tier-${t}`
       <template v-else>
         <!-- Header with human + bot character -->
         <div class="text-center mb-5">
-          <div class="flex items-end justify-center gap-2 mb-3">
+          <div class="flex items-end justify-between mb-3">
             <HumanPreview
               :seed="stats.avatarSeed || stats.name"
               :archetype="stats.archetype || 'standard'"
               :size="200"
               :win-rate="(stats.winRate || 0) / 100"
               anim="idle"
-              class="drop-shadow-[0_0_12px_rgba(0,0,0,0.6)]"
+              class="drop-shadow-[0_0_12px_rgba(0,0,0,0.6)] shrink-0"
             />
             <SpritePreview
               :seed="stats.avatarSeed || stats.name"
@@ -296,7 +296,7 @@ const tierClass = (t: number) => `tier-${t}`
               :tier="stats.tier"
               :size="160"
               :customization="stats.customization || undefined"
-              class="drop-shadow-[0_0_20px_var(--glow)]"
+              class="drop-shadow-[0_0_20px_var(--glow)] mx-auto"
               :style="{ '--glow': stats.tierColor + '80' } as any"
             />
           </div>