feat(search) : display reference alongside name in all entity select components

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

app/components/machine/AddEntityToMachineModal.vue

@@ -147,7 +147,10 @@ const selectedTypeName = computed(() => {
   return found?.name || ''
 })
 
-const entityOptionLabel = (e: any) => e.name || '(sans nom)'
+const entityOptionLabel = (e: any) => {
+  const name = e.name || '(sans nom)'
+  return e.reference ? `${name} — ${e.reference}` : name
+}
 const entityOptionDescription = (e: any) => e.reference || ''
 
 const selectedEntitySummary = computed(() => {