feat(web): close #358 invites RowActionsMenu wiring

The mobile-responsive design called for all 4 admin tables to use
RowActionsMenu. Requests + Quarantine + Users users-section landed
in earlier commits; the invites section in the same users page was
still rendering inline Copy/Revoke buttons. Now uses RowActionsMenu
with primary Copy + secondary Revoke (danger).

Extend expiry from the design's secondary list deferred — no
server endpoint exists yet (lib/api/admin.ts has no
extendInviteExpiry).

Closes the in-code portion of #358. Real-device verification
walkthrough at 375/414/768 + grid/safe-area checks remain
operator-side.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

web/src/routes/admin/users/+page.svelte

@@ -20,7 +20,7 @@
   import { pushToast } from '$lib/stores/toast.svelte';
   import Modal from '$lib/components/Modal.svelte';
   import RowActionsMenu, { type RowAction } from '$lib/components/RowActionsMenu.svelte';
-  import { Shield, ShieldOff, CheckCircle2, XCircle, KeyRound, Trash2 } from 'lucide-svelte';
+  import { Shield, ShieldOff, CheckCircle2, XCircle, KeyRound, Trash2, Copy } from 'lucide-svelte';
 
   const client = useQueryClient();
 
@@ -329,23 +329,24 @@
             <span class="shrink-0 text-xs text-text-secondary">
               expires {formatDate(inv.expires_at)}
             </span>
-            <button
-              type="button"
-              aria-label={`Copy token for invite ${inv.token}`}
-              class="inline-flex items-center gap-1 rounded-md border border-border bg-transparent px-3 py-1.5 text-sm text-text-secondary hover:bg-surface-hover hover:text-text-primary"
-              onclick={() => copyToken(inv.token)}
-            >
-              Copy
-            </button>
-            <button
-              type="button"
-              disabled={saving}
-              aria-label={`Revoke invite ${inv.token}`}
-              class="inline-flex items-center gap-1 rounded-md border border-border bg-transparent px-3 py-1.5 text-sm text-text-secondary hover:bg-surface-hover hover:text-text-primary disabled:cursor-not-allowed disabled:opacity-50"
-              onclick={() => onRevokeInvite(inv)}
-            >
-              Revoke
-            </button>
+            <RowActionsMenu
+              primary={{
+                icon: Copy,
+                label: 'Copy',
+                ariaLabel: `Copy token for invite ${inv.token}`,
+                onclick: () => copyToken(inv.token)
+              }}
+              secondary={[
+                {
+                  icon: Trash2,
+                  label: 'Revoke',
+                  ariaLabel: `Revoke invite ${inv.token}`,
+                  onclick: () => onRevokeInvite(inv),
+                  danger: true,
+                  disabled: saving
+                }
+              ]}
+            />
           </li>
         {/each}
       </ul>