The shop PC's avatar had the same V1 collision

Fixed on the web arrivals feed and not here, which is the failure this
codebase already warns about: two surfaces disagreeing about one fact.
Taking the first letter of each word of "Visitor 13" gives "V1" - and so
do "Visitor 10" and "Visitor 15", so three different customers wear the
same badge and it reads as the V-1 reference for a fourth.

Shows the number itself, same rule as the web app. customerRef, not
ref: React reserves that prop name and it would never arrive.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HViLj9gYNRtSr7YVZmW5sn

desktop/frontend/src/views/CustomerForm.jsx

@@ -57,6 +57,7 @@ export default function CustomerForm({ customer, session, onClose, onSaved }) {
       <div className="panel">
         <div className="who">
           <CustomerPhoto photo={shown} name={customer.full_name || customer.label}
+                         customerRef={customer.ref}
                          onBroken={() => setPhoto({ available: false,
                            reason: 'The photo could not be loaded.' })} />
           <div className="grow">