feat(chat): TTS for chat responses + fix team FAQ with real founder names

- Chat answers are now read aloud via Edge TTS (auto, with mute toggle)
- FAQ team answer: vague text → Benjamin Boenisch (CEO) + Sharang (CTO)
- System prompt: explicit instruction to always cite team names from DB
- Speaker icon in chat header shows speaking state, click to mute/unmute
- Audio stops on new message, chat close, or mute

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

pitch-deck/components/ChatFAB.tsx

@@ -2,7 +2,7 @@
 
 import { useState, useRef, useEffect, useMemo } from 'react'
 import { motion, AnimatePresence } from 'framer-motion'
-import { X, Send, Bot, User, Sparkles, Maximize2, Minimize2, ArrowRight } from 'lucide-react'
+import { X, Send, Bot, User, Sparkles, Maximize2, Minimize2, ArrowRight, Volume2, VolumeX } from 'lucide-react'
 import { ChatMessage, Language, SlideId } from '@/lib/types'
 import { t } from '@/lib/i18n'
 import { SLIDE_ORDER } from '@/lib/hooks/useSlideNavigation'
@@ -116,9 +116,72 @@ export default function ChatFAB({
   const [isStreaming, setIsStreaming] = useState(false)
   const [isWaiting, setIsWaiting] = useState(false)
   const [parsedResponses, setParsedResponses] = useState<Map<number, ParsedMessage>>(new Map())
+  const [chatTtsEnabled, setChatTtsEnabled] = useState(true)
+  const [isChatSpeaking, setIsChatSpeaking] = useState(false)
   const messagesEndRef = useRef<HTMLDivElement>(null)
   const inputRef = useRef<HTMLInputElement>(null)
   const abortRef = useRef<AbortController | null>(null)
+  const chatAudioRef = useRef<HTMLAudioElement | null>(null)
+  const ttsAbortRef = useRef<AbortController | null>(null)
+
+  const cancelChatAudio = () => {
+    if (chatAudioRef.current) {
+      chatAudioRef.current.pause()
+      chatAudioRef.current = null
+    }
+    if (ttsAbortRef.current) {
+      ttsAbortRef.current.abort()
+      ttsAbortRef.current = null
+    }
+    setIsChatSpeaking(false)
+  }
+
+  const speakResponse = async (text: string) => {
+    if (!chatTtsEnabled) return
+    cancelChatAudio()
+
+    // Clean text for TTS: remove markdown formatting, keep plain speech
+    const cleanText = text
+      .replace(/\*\*(.+?)\*\*/g, '$1')
+      .replace(/\[GOTO:[\w-]+\]/g, '')
+      .replace(/\[Q\]\s*/g, '')
+      .replace(/---/g, '')
+      .trim()
+
+    if (!cleanText) return
+
+    const controller = new AbortController()
+    ttsAbortRef.current = controller
+
+    try {
+      const res = await fetch('/api/presenter/tts', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ text: cleanText, language: lang }),
+        signal: controller.signal,
+      })
+      if (!res.ok || controller.signal.aborted) return
+
+      const blob = await res.blob()
+      const url = URL.createObjectURL(blob)
+      const audio = new Audio(url)
+      chatAudioRef.current = audio
+      setIsChatSpeaking(true)
+
+      audio.onended = () => {
+        setIsChatSpeaking(false)
+        chatAudioRef.current = null
+      }
+      audio.onerror = () => {
+        setIsChatSpeaking(false)
+        chatAudioRef.current = null
+      }
+
+      await audio.play()
+    } catch {
+      setIsChatSpeaking(false)
+    }
+  }
 
   useEffect(() => {
     messagesEndRef.current?.scrollIntoView({ behavior: 'smooth' })
@@ -143,6 +206,9 @@ export default function ChatFAB({
       const msg = messages[lastAssistantIndex]
       const parsed = parseAgentResponse(msg.content, lang)
       setParsedResponses(prev => new Map(prev).set(lastAssistantIndex, parsed))
+
+      // Speak the response via TTS
+      speakResponse(parsed.text)
     }
   }, [isStreaming, lastAssistantIndex, messages, parsedResponses, lang])
 
@@ -155,6 +221,7 @@ export default function ChatFAB({
       onPresenterInterrupt()
     }
 
+    cancelChatAudio()
     setInput('')
     setMessages(prev => [...prev, { role: 'user', content: message }])
     setIsStreaming(true)
@@ -374,6 +441,26 @@ export default function ChatFAB({
                 </div>
               </div>
               <div className="flex items-center gap-1">
+                <button
+                  onClick={() => {
+                    setChatTtsEnabled(prev => {
+                      if (prev) cancelChatAudio()
+                      return !prev
+                    })
+                  }}
+                  className={`w-7 h-7 rounded-full flex items-center justify-center transition-colors ${
+                    isChatSpeaking ? 'bg-indigo-500/30' : 'bg-white/10 hover:bg-white/20'
+                  }`}
+                  title={chatTtsEnabled
+                    ? (lang === 'de' ? 'Sprachausgabe aus' : 'Mute voice')
+                    : (lang === 'de' ? 'Sprachausgabe ein' : 'Unmute voice')
+                  }
+                >
+                  {chatTtsEnabled
+                    ? <Volume2 className={`w-3.5 h-3.5 ${isChatSpeaking ? 'text-indigo-400' : 'text-white/60'}`} />
+                    : <VolumeX className="w-3.5 h-3.5 text-white/40" />
+                  }
+                </button>
                 <button
                   onClick={() => setIsExpanded(prev => !prev)}
                   className="w-7 h-7 rounded-full bg-white/10 flex items-center justify-center hover:bg-white/20 transition-colors"
@@ -381,7 +468,10 @@ export default function ChatFAB({
                   {isExpanded ? <Minimize2 className="w-3.5 h-3.5 text-white/60" /> : <Maximize2 className="w-3.5 h-3.5 text-white/60" />}
                 </button>
                 <button
-                  onClick={() => setIsOpen(false)}
+                  onClick={() => {
+                    cancelChatAudio()
+                    setIsOpen(false)
+                  }}
                   className="w-7 h-7 rounded-full bg-white/10 flex items-center justify-center hover:bg-white/20 transition-colors"
                 >
                   <X className="w-4 h-4 text-white/60" />