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/components/ui/SignupModal.tsx

@@ -5,6 +5,7 @@ import { createPortal } from "react-dom";
 import { X, CheckCircle, Send, Phone as PhoneIcon, Instagram } from "lucide-react";
 import { BRAND } from "@/lib/constants";
 import { useFocusTrap } from "@/hooks/useFocusTrap";
+import { formatBelarusPhone } from "@/lib/formatting";
 
 interface SignupModalProps {
   open: boolean;
@@ -51,19 +52,7 @@ export function SignupModal({
   const focusTrapRef = useFocusTrap<HTMLDivElement>(open);
 
   function handlePhoneChange(raw: string) {
-    let digits = raw.replace(/\D/g, "");
-    if (!digits.startsWith("375")) {
-      digits = "375" + digits.replace(/^375?/, "");
-    }
-    digits = digits.slice(0, 12);
-    let formatted = "+375";
-    const rest = digits.slice(3);
-    if (rest.length > 0) formatted += " (" + rest.slice(0, 2);
-    if (rest.length >= 2) formatted += ") ";
-    if (rest.length > 2) formatted += rest.slice(2, 5);
-    if (rest.length > 5) formatted += "-" + rest.slice(5, 7);
-    if (rest.length > 7) formatted += "-" + rest.slice(7, 9);
-    setPhone(formatted);
+    setPhone(formatBelarusPhone(raw));
   }
 
   useEffect(() => {
@@ -86,7 +75,7 @@ export function SignupModal({
     setError("");
 
     const cleanPhone = phone.replace(/\D/g, "");
-    if (cleanPhone.length < 12) {
+    if (!/^375(25|29|33|44)\d{7}$/.test(cleanPhone)) {
       setError("Введите корректный номер телефона");
       return;
     }
@@ -288,7 +277,7 @@ export function SignupModal({
               </div>
 
               {error && error !== "network" && (
-                <p id="error-phone" className="text-sm text-red-400">{error}</p>
+                <p id="error-phone" role="alert" className="text-sm text-red-400">{error}</p>
               )}
 
               <button