feat: mobile UX, admin polish, rate limiting, and media assets

- Mobile responsiveness improvements across admin and public sections
- Admin: bookings modal, open-day page, team page, layout polish
- Added rate limiting, CSRF hardening, auth-edge improvements
- Scroll reveal, floating contact, back-to-top, Yandex map fixes
- Schedule filters refactor, team profile/info component updates
- New useTrainerPhotos hook
- Added class, team, master-class, and news images

src/app/admin/_components/PriceField.tsx

@@ -16,9 +16,10 @@ export function PriceField({ label, value, onChange, placeholder = "0" }: PriceF
       <div className="flex rounded-lg border border-white/10 bg-neutral-800 focus-within:border-gold transition-colors">
         <input
           type="text"
+          inputMode="decimal"
           value={raw}
           onChange={(e) => {
-            const v = e.target.value;
+            const v = e.target.value.replace(/[^\d.,\s]/g, "");
             onChange(v ? `${v} BYN` : "");
           }}
           placeholder={placeholder}