Booking flow: required terms and privacy checkbox with i18n

Also includes admin, dashboard, and API updates; PWA icon assets; and
assorted layout and utility changes on dev.

frontend/src/components/layout/Header.tsx

@@ -124,6 +124,7 @@ export default function Header() {
               width={140}
               height={40}
               className="h-10 w-auto"
+              style={{ width: 'auto' }}
               priority
             />
           </Link>
@@ -219,6 +220,7 @@ export default function Header() {
             width={100}
             height={28}
             className="h-7 w-auto"
+            style={{ width: 'auto' }}
           />
           <button
             className="p-2 rounded-lg hover:bg-gray-100 transition-colors"