Normalize ticket labels to "Cars <département>" in HexInput

Rename prefill button labels: Bus Ardèche → Cars Ardèche,
Bus Ain → Cars Ain, Drôme Bus → Cars Drôme.

https://claude.ai/code/session_01NAa8pzg9GUivQcSjSRTcUS

Author: claude

website/src/components/HexInput.tsx

@@ -16,9 +16,9 @@ const PREFILLS = [
   { label: 'Sample', hex: SAMPLE_TICKET_HEX },
   { label: 'SNCF TER', hex: SNCF_TER_TICKET_HEX },
   { label: 'Solea', hex: SOLEA_TICKET_HEX },
-  { label: 'Bus Ardèche', hex: BUS_ARDECHE_TICKET_HEX },
-  { label: 'Bus Ain', hex: BUS_AIN_TICKET_HEX },
-  { label: 'Drôme Bus', hex: DROME_BUS_TICKET_HEX },
+  { label: 'Cars Ardèche', hex: BUS_ARDECHE_TICKET_HEX },
+  { label: 'Cars Ain', hex: BUS_AIN_TICKET_HEX },
+  { label: 'Cars Drôme', hex: DROME_BUS_TICKET_HEX },
   { label: 'CTS', hex: CTS_TICKET_HEX },
   { label: 'Grand Est', hex: GRAND_EST_U1_FCB3_HEX },
 ];