build(admin): track the SPA build output so git deploys carry it

assets/admin/build was gitignored, so servers deployed by git pull kept
running a stale admin bundle — the icon picker integration in the tabbar
and floating-button settings pages never reached them. Track the build
directory (rebuild with: cd assets/admin && npm run build) and commit the
current bundle containing the universal icon picker.

assets/admin/build/UsersVerify.css

@@ -0,0 +1 @@
+.aksrt-status-card[data-v-2e5fcc8a] .n-card__content{display:flex;align-items:flex-end;justify-content:space-between;gap:12px}.aksrt-section-card[data-v-2e5fcc8a],.aksrt-provider-tabs[data-v-2e5fcc8a]{margin-top:16px}.aksrt-form-actions[data-v-2e5fcc8a]{display:flex;justify-content:flex-end;gap:12px;margin-top:20px}