feat(teamsbot): dynamic voice API, session auto-load, clean API types

- Dynamic language list from Google TTS API (string codes instead of objects)
- Voice test sends botName for AI-generated sample text per language
- Session view auto-loads most recent session when no sessionId given
- Shows "Keine Sitzungen vorhanden" when no sessions exist
- Updated testVoice API to pass botName instead of static text

Co-authored-by: Cursor <cursoragent@cursor.com>

src/api/teamsbotApi.ts

@@ -186,16 +186,16 @@ export async function updateConfig(instanceId: string, updates: ConfigUpdateRequ
 }
 
 /**
- * Test TTS voice with a sample text. Returns base64-encoded audio.
+ * Test TTS voice with AI-generated sample text. Returns base64-encoded audio.
  */
 export async function testVoice(
   instanceId: string,
-  text: string,
+  botName: string,
   language: string,
   voiceId?: string,
-): Promise<{ success: boolean; audio?: string; format?: string; error?: string }> {
+): Promise<{ success: boolean; audio?: string; format?: string; text?: string; error?: string }> {
   const response = await api.post(`/api/teamsbot/${instanceId}/voice/test`, {
-    text,
+    botName,
     language,
     voiceId,
   });
@@ -204,8 +204,9 @@ export async function testVoice(
 
 /**
  * Fetch available TTS languages from Google Cloud.
+ * Returns array of language codes (e.g. ["de-DE", "en-US", ...])
  */
-export async function fetchLanguages(): Promise<VoiceLanguage[]> {
+export async function fetchLanguages(): Promise<string[]> {
   try {
     const response = await api.get('/voice-google/languages');
     return response.data?.languages || [];

src/pages/views/teamsbot/TeamsbotSessionView.tsx

@@ -11,25 +11,44 @@ import styles from './Teamsbot.module.css';
 export const TeamsbotSessionView: React.FC = () => {
   const { instance } = useCurrentInstance();
   const instanceId = instance?.id || '';
-  const [searchParams] = useSearchParams();
+  const [searchParams, setSearchParams] = useSearchParams();
   const sessionId = searchParams.get('sessionId') || '';
 
   const [session, setSession] = useState<TeamsbotSession | null>(null);
   const [transcripts, setTranscripts] = useState<TeamsbotTranscript[]>([]);
   const [botResponses, setBotResponses] = useState<TeamsbotBotResponse[]>([]);
   const [loading, setLoading] = useState(true);
+  const [noSessions, setNoSessions] = useState(false);
   const [error, setError] = useState<string | null>(null);
   const [isLive, setIsLive] = useState(false);
 
   const transcriptEndRef = useRef<HTMLDivElement>(null);
   const eventSourceRef = useRef<EventSource | null>(null);
 
-  // Load session data
+  // Load session data - if no sessionId given, load the most recent session
   const _loadSession = useCallback(async () => {
-    if (!instanceId || !sessionId) return;
+    if (!instanceId) return;
     try {
       setLoading(true);
-      const result = await teamsbotApi.getSession(instanceId, sessionId);
+      setNoSessions(false);
+
+      let targetSessionId = sessionId;
+
+      // No sessionId in URL -> find the most recent session
+      if (!targetSessionId) {
+        const listResult = await teamsbotApi.listSessions(instanceId, true);
+        const sessions = listResult.sessions || [];
+        if (sessions.length === 0) {
+          setNoSessions(true);
+          setLoading(false);
+          return;
+        }
+        // Pick the most recent (first in list, sorted by creation date desc)
+        targetSessionId = sessions[0].id;
+        setSearchParams({ sessionId: targetSessionId }, { replace: true });
+      }
+
+      const result = await teamsbotApi.getSession(instanceId, targetSessionId);
       setSession(result.session);
       setTranscripts(result.transcripts || []);
       setBotResponses(result.botResponses || []);
@@ -39,7 +58,7 @@ export const TeamsbotSessionView: React.FC = () => {
     } finally {
       setLoading(false);
     }
-  }, [instanceId, sessionId]);
+  }, [instanceId, sessionId, setSearchParams]);
 
   useEffect(() => {
     _loadSession();
@@ -134,6 +153,12 @@ export const TeamsbotSessionView: React.FC = () => {
   };
 
   if (loading) return <div className={styles.loading}>Lade Sitzung...</div>;
+  if (noSessions) return (
+    <div className={styles.emptyState || styles.loading}>
+      <p>Keine Sitzungen vorhanden.</p>
+      <p>Starte eine neue Sitzung im <strong>Dashboard</strong>.</p>
+    </div>
+  );
   if (!session) return <div className={styles.errorBanner}>Sitzung nicht gefunden</div>;
 
   return (

src/pages/views/teamsbot/TeamsbotSettingsView.tsx

@@ -33,7 +33,7 @@ export const TeamsbotSettingsView: React.FC = () => {
   const [formData, setFormData] = useState<ConfigUpdateRequest>({});
 
   // Dynamic voice data from Google TTS API
-  const [languages, setLanguages] = useState<VoiceLanguage[]>([]);
+  const [languages, setLanguages] = useState<string[]>([]);
   const [voices, setVoices] = useState<VoiceOption[]>([]);
   const [loadingVoices, setLoadingVoices] = useState(false);
 
@@ -111,8 +111,7 @@ export const TeamsbotSettingsView: React.FC = () => {
     try {
       const language = formData.language || 'de-DE';
       const botName = formData.botName || 'AI Assistant';
-      const testText = `Hallo, ich bin ${botName}. So klinge ich in diesem Meeting.`;
-      const result = await teamsbotApi.testVoice(instanceId, testText, language, formData.voiceId);
+      const result = await teamsbotApi.testVoice(instanceId, botName, language, formData.voiceId);
       
       if (result.success && result.audio) {
         // Play audio from base64
@@ -221,8 +220,8 @@ export const TeamsbotSettingsView: React.FC = () => {
               onChange={(e) => _handleLanguageChange(e.target.value)}
             >
               {languages.length > 0 ? (
-                languages.map((lang, idx) => (
-                  <option key={`${lang.code}-${idx}`} value={lang.code}>{lang.name} ({lang.code})</option>
+                languages.map((langCode, idx) => (
+                  <option key={`${langCode}-${idx}`} value={langCode}>{langCode}</option>
                 ))
               ) : (
                 <>