fix: outbound call — End Call label, force active state after auto-answer

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/components/call-desk/active-call-card.tsx

@@ -124,7 +124,7 @@ export const ActiveCallCard = ({ lead, callerPhone }: ActiveCallCardProps) => {
                 </div>
                 <div className="mt-3 flex gap-2">
                     <Button size="sm" color="primary-destructive" onClick={() => { hangup(); handleReset(); }}>
-                        Cancel
+                        End Call
                     </Button>
                 </div>
             </div>