feat: QR-Code für alle Kanäle (contact_id in ConversationResponse)

tui/screens/main_screen.py

@@ -289,17 +289,14 @@ class MainScreen(Screen):
         asyncio.create_task(self._generate_telegram_qr())
 
     async def _generate_telegram_qr(self) -> None:
-        if not self._current_conv:
+        if not self._current_conv_id:
             self.notify("Bitte erst eine Konversation auswählen.", severity="warning")
             return
-        conv = self._current_conv
-        if conv.get("channel") != "telegram":
-            self.notify("QR-Code nur für Telegram-Konversationen.", severity="warning")
-            return
+        conv = self._current_conv or {}
         contact_id = conv.get("contact_id")
         if not contact_id:
             try:
-                details = await self._api.get_conversation(conv["id"])
+                details = await self._api.get_conversation(self._current_conv_id)
                 contact_id = (details or {}).get("contact_id")
             except Exception:
                 pass