Debug: log notify_qr_photos

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

src/ui/screens/home_screen.py

@@ -427,6 +427,7 @@ class HomeScreen(QWidget):
 
     def notify_qr_photos(self, photo_paths):
         """Appelé par le service upload quand des photos arrivent via QR/WiFi."""
+        print(f"[Photostation] QR photos received: {len(photo_paths)} files")
         self._qr_received_photos.extend(photo_paths)
         count = len(self._qr_received_photos)
         self.mode_buttons["QR Code"].setStyleSheet(green_btn(self))