fix(contacts): type label bug, responsive buttons, remove Copy Key

- Fix pending contacts always showing "CLI" — compute type_label in API
- Remove Copy Key button from pending cards, make key clickable instead
- Responsive contact buttons: icon+text on desktop, icon-only on <=768px
- Add flex-wrap for button rows on small screens

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/static/css/style.css

@@ -333,6 +333,18 @@ main {
         font-size: 0.875rem;
     }
 
+    /* Contact card buttons: icon-only on mobile */
+    .pending-contact-card .btn-label,
+    .existing-contact-card .btn-label {
+        display: none;
+    }
+
+    /* Allow button wrapping on small screens */
+    .pending-contact-card .d-flex.gap-2,
+    .existing-contact-card .d-flex.gap-2 {
+        flex-wrap: wrap;
+    }
+
     /* Modal: Better mobile layout */
     .modal-dialog {
         margin: 0.5rem;