Fix link copy toast messages, remove custom toast in favor of authStore, remove a component that was no longer used.

frontend/src/components/ProfileView.vue

@@ -108,6 +108,7 @@
       v-if="showRegLink"
       endpoint="/auth/api/user/create-link"
       @close="showRegLink = false"
+      @copied="onLinkCopied"
     />
   </section>
 </template>
@@ -184,6 +185,10 @@ const handlePairingError = (message) => {
   }
 }
 
+const onLinkCopied = () => {
+  authStore.showMessage('📋 Link copied! Send it to your other device.')
+}
+
 // Helper to focus preferred button in a row (primary first, or first button)
 const focusPreferredButton = (container) => {
   focusPreferred(container, { primarySelector: '.btn-primary', itemSelector: 'button' })