feat: mobile UX improvements across admin and public site

- Team carousel: simple swipe on mobile instead of drag
- Schedule: filter button inline with hall tabs, larger on mobile
- Schedule filters: fix nested button hydration error
- Admin bookings: select dropdown on mobile, filter highlight on dashboard cards
- Admin bookings: searchable dropdowns in add booking modal with class selector
- Admin bookings: waiting list divider inside groups
- Admin bookings: new bookings appear without page reload
- Admin open-day: action buttons visible on mobile, confirm dialog, click-outside to close edit
- API: pass groupInfo on group booking creation
- SignupModal: Instagram link on success popup

src/components/ui/SignupModal.tsx

@@ -188,6 +188,15 @@ export function SignupModal({
                   {successMessage || "Вы записаны!"}
                 </h3>
                 {subtitle && <p className="mt-1 text-sm text-neutral-400">{subtitle}</p>}
+                <a
+                  href={BRAND.instagram}
+                  target="_blank"
+                  rel="noopener noreferrer"
+                  className="mt-3 inline-flex items-center gap-1.5 text-sm text-pink-400 hover:text-pink-300"
+                >
+                  <Instagram size={14} />
+                  {instagramHint || "По вопросам пишите в Instagram"}
+                </a>
               </>
             )}
           </div>