UX: Close the QR code/link dialog automatically when the code is click-to-copied.

frontend/src/admin/AdminUserDetail.vue

@@ -36,6 +36,7 @@ const hasActiveModal = computed(() => props.showRegModal)
 
 function onLinkCopied() {
   authStore.showMessage(`📋 Link copied! Send it to ${props.selectedUser.display_name}.`)
+  emit('closeRegModal')
 }
 
 function handleEditName() {

frontend/src/components/ProfileView.vue

@@ -187,6 +187,7 @@ const handlePairingError = (message) => {
 
 const onLinkCopied = () => {
   authStore.showMessage('📋 Link copied! Send it to your other device.')
+  showRegLink.value = false
 }
 
 // Helper to focus preferred button in a row (primary first, or first button)