feat(teamsbot): session context textarea in dashboard, API type for sessionContext

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

src/api/teamsbotApi.ts

@@ -83,6 +83,7 @@ export interface StartSessionRequest {
   backgroundImageUrl?: string;
   connectionId?: string;
   joinMode?: TeamsbotJoinMode;
+  sessionContext?: string;
 }
 
 export interface ConfigUpdateRequest {

src/pages/views/teamsbot/TeamsbotDashboardView.tsx

@@ -22,6 +22,7 @@ export const TeamsbotDashboardView: React.FC = () => {
   const [meetingLink, setMeetingLink] = useState('');
   const [botName, setBotName] = useState('');
   const [joinMode, setJoinMode] = useState<TeamsbotJoinMode>('anonymous');
+  const [sessionContext, setSessionContext] = useState('');
   const [isStarting, setIsStarting] = useState(false);
 
   const _loadSessions = useCallback(async () => {
@@ -65,6 +66,7 @@ export const TeamsbotDashboardView: React.FC = () => {
         meetingLink: meetingLink.trim(),
         botName: botName.trim() || undefined,
         joinMode: joinMode,
+        sessionContext: sessionContext.trim() || undefined,
       };
       
       await teamsbotApi.startSession(instanceId, request);
@@ -170,6 +172,23 @@ export const TeamsbotDashboardView: React.FC = () => {
           />
         </div>
 
+        <div className={styles.formGroup}>
+          <label className={styles.label}>Session-Kontext (optional)</label>
+          <textarea
+            className={styles.textarea || styles.input}
+            placeholder="Agenda, Hintergrundinformationen, Dokumente oder andere Informationen fuer den Bot..."
+            value={sessionContext}
+            onChange={(e) => setSessionContext(e.target.value)}
+            disabled={isStarting}
+            rows={4}
+            style={{ resize: 'vertical', minHeight: '80px' }}
+          />
+          <span style={{ fontSize: '12px', color: '#888' }}>
+            Kontext den der Bot waehrend der Sitzung nutzen kann (z.B. Meeting-Agenda, Projektinfos).
+            {sessionContext.length > 0 && ` (${sessionContext.length} Zeichen)`}
+          </span>
+        </div>
+
         <button
           className={styles.startButton}
           onClick={_handleStartSession}