feat: add booking management, Open Day, unified signup modal

- MC registrations: notification toggles (confirm/remind) with urgency
- Group bookings: save to DB from BookingModal, admin CRUD at /admin/bookings
- Open Day: full event system with schedule grid (halls × time), per-class
  booking, discount pricing (30 BYN / 20 BYN from 3+), auto-cancel threshold
- Unified SignupModal replaces 3 separate forms — consistent fields
  (name, phone, instagram, telegram), Instagram DM fallback on network error
- Centralized /admin/bookings page with 3 tabs (classes, MC, Open Day),
  collapsible sections, notification toggles, filter chips
- Unread booking badge on sidebar + dashboard widget with per-type breakdown
- Pricing: contact hint (Instagram/Telegram/phone) on price & rental tabs,
  admin toggle to show/hide
- DB migrations 5-7: group_bookings table, open_day tables, unified fields

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/components/ui/BookingModal.tsx

@@ -71,6 +71,12 @@ export function BookingModal({ open, onClose, groupInfo, contact: contactProp }:
   const handleSubmit = useCallback(
     (e: React.FormEvent) => {
       e.preventDefault();
+      // Save booking to DB (fire-and-forget)
+      fetch("/api/group-booking", {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify({ name, phone, groupInfo }),
+      }).catch(() => {});
       // Build Instagram DM message with pre-filled text
       const groupText = groupInfo ? ` (${groupInfo})` : "";
       const message = `Здравствуйте! Меня зовут ${name}, хочу записаться на занятие${groupText}. Мой телефон: ${phone}`;

src/components/ui/OpenDaySignupModal.tsx

@@ -0,0 +1,210 @@
+"use client";
+
+import { useState, useEffect, useCallback } from "react";
+import { createPortal } from "react-dom";
+import { X, CheckCircle, Send, Phone as PhoneIcon } from "lucide-react";
+
+interface OpenDaySignupModalProps {
+  open: boolean;
+  onClose: () => void;
+  classId: number;
+  eventId: number;
+  classLabel: string;
+}
+
+export function OpenDaySignupModal({ open, onClose, classId, eventId, classLabel }: OpenDaySignupModalProps) {
+  const [name, setName] = useState("");
+  const [phone, setPhone] = useState("+375 ");
+  const [instagram, setInstagram] = useState("");
+  const [telegram, setTelegram] = useState("");
+  const [submitting, setSubmitting] = useState(false);
+  const [error, setError] = useState("");
+  const [result, setResult] = useState<{ totalBookings: number; pricePerClass: number } | null>(null);
+
+  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);
+  }
+
+  useEffect(() => {
+    if (!open) return;
+    function onKey(e: KeyboardEvent) {
+      if (e.key === "Escape") onClose();
+    }
+    document.addEventListener("keydown", onKey);
+    return () => document.removeEventListener("keydown", onKey);
+  }, [open, onClose]);
+
+  useEffect(() => {
+    if (open) document.body.style.overflow = "hidden";
+    else document.body.style.overflow = "";
+    return () => { document.body.style.overflow = ""; };
+  }, [open]);
+
+  const handleSubmit = useCallback(async (e: React.FormEvent) => {
+    e.preventDefault();
+    setError("");
+    setSubmitting(true);
+
+    const cleanPhone = phone.replace(/\D/g, "");
+    if (cleanPhone.length < 12) {
+      setError("Введите корректный номер телефона");
+      setSubmitting(false);
+      return;
+    }
+
+    try {
+      const res = await fetch("/api/open-day-register", {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify({
+          classId,
+          eventId,
+          name: name.trim(),
+          phone: cleanPhone,
+          instagram: instagram.trim() ? `@${instagram.trim()}` : undefined,
+          telegram: telegram.trim() ? `@${telegram.trim()}` : undefined,
+        }),
+      });
+      const data = await res.json();
+      if (!res.ok) {
+        setError(data.error || "Ошибка при записи");
+        setSubmitting(false);
+        return;
+      }
+      setResult({ totalBookings: data.totalBookings, pricePerClass: data.pricePerClass });
+    } catch {
+      setError("Ошибка сети");
+    } finally {
+      setSubmitting(false);
+    }
+  }, [classId, eventId, name, phone, instagram, telegram]);
+
+  const handleClose = useCallback(() => {
+    onClose();
+    setTimeout(() => {
+      setName("");
+      setPhone("+375 ");
+      setInstagram("");
+      setTelegram("");
+      setError("");
+      setResult(null);
+    }, 300);
+  }, [onClose]);
+
+  if (!open) return null;
+
+  return createPortal(
+    <div className="modal-overlay fixed inset-0 z-50 flex items-center justify-center p-4" onClick={handleClose}>
+      <div className="absolute inset-0 bg-black/70 backdrop-blur-sm" />
+      <div
+        className="modal-content relative w-full max-w-md rounded-2xl border border-white/[0.08] bg-[#0a0a0a] p-6 sm:p-8 shadow-2xl"
+        onClick={(e) => e.stopPropagation()}
+      >
+        <button
+          onClick={handleClose}
+          className="absolute right-4 top-4 flex h-8 w-8 items-center justify-center rounded-full text-neutral-500 transition-colors hover:bg-white/[0.06] hover:text-white cursor-pointer"
+        >
+          <X size={18} />
+        </button>
+
+        {result ? (
+          <div className="py-4 text-center">
+            <div className="mx-auto mb-4 flex h-14 w-14 items-center justify-center rounded-full bg-emerald-500/10">
+              <CheckCircle size={28} className="text-emerald-500" />
+            </div>
+            <h3 className="text-lg font-bold text-white">Вы записаны!</h3>
+            <p className="mt-2 text-sm text-neutral-400">{classLabel}</p>
+            <p className="mt-3 text-sm text-white">
+              Вы записаны на <span className="text-gold font-semibold">{result.totalBookings}</span> занятий.
+              <br />
+              Стоимость: <span className="text-gold font-semibold">{result.pricePerClass} BYN</span> за занятие
+            </p>
+            <button
+              onClick={handleClose}
+              className="mt-6 rounded-full bg-gold px-6 py-2.5 text-sm font-semibold text-black transition-all hover:bg-gold-light cursor-pointer"
+            >
+              Закрыть
+            </button>
+          </div>
+        ) : (
+          <>
+            <div className="mb-6">
+              <h3 className="text-xl font-bold text-white">Записаться</h3>
+              <p className="mt-1 text-sm text-neutral-400">{classLabel}</p>
+            </div>
+
+            <form onSubmit={handleSubmit} className="space-y-3">
+              <input
+                type="text"
+                value={name}
+                onChange={(e) => setName(e.target.value)}
+                placeholder="Ваше имя"
+                required
+                className="w-full rounded-xl border border-white/[0.08] bg-white/[0.04] px-4 py-3 text-sm text-white placeholder-neutral-500 outline-none transition-colors focus:border-gold/40 focus:bg-white/[0.06]"
+              />
+              <div className="relative">
+                <PhoneIcon size={14} className="absolute left-3 top-1/2 -translate-y-1/2 text-neutral-500" />
+                <input
+                  type="tel"
+                  value={phone}
+                  onChange={(e) => handlePhoneChange(e.target.value)}
+                  placeholder="+375 (__) ___-__-__"
+                  required
+                  className="w-full rounded-xl border border-white/[0.08] bg-white/[0.04] pl-9 pr-4 py-3 text-sm text-white placeholder-neutral-500 outline-none transition-colors focus:border-gold/40 focus:bg-white/[0.06]"
+                />
+              </div>
+              <div className="grid grid-cols-2 gap-2">
+                <div className="relative">
+                  <span className="absolute left-3 top-1/2 -translate-y-1/2 text-neutral-500 text-xs">@</span>
+                  <input
+                    type="text"
+                    value={instagram}
+                    onChange={(e) => setInstagram(e.target.value.replace(/^@/, ""))}
+                    placeholder="Instagram"
+                    className="w-full rounded-xl border border-white/[0.08] bg-white/[0.04] pl-7 pr-3 py-3 text-sm text-white placeholder-neutral-500 outline-none transition-colors focus:border-gold/40 focus:bg-white/[0.06]"
+                  />
+                </div>
+                <div className="relative">
+                  <span className="absolute left-3 top-1/2 -translate-y-1/2 text-neutral-500 text-xs">@</span>
+                  <input
+                    type="text"
+                    value={telegram}
+                    onChange={(e) => setTelegram(e.target.value.replace(/^@/, ""))}
+                    placeholder="Telegram"
+                    className="w-full rounded-xl border border-white/[0.08] bg-white/[0.04] pl-7 pr-3 py-3 text-sm text-white placeholder-neutral-500 outline-none transition-colors focus:border-gold/40 focus:bg-white/[0.06]"
+                  />
+                </div>
+              </div>
+
+              {error && (
+                <p className="text-sm text-red-400">{error}</p>
+              )}
+
+              <button
+                type="submit"
+                disabled={submitting}
+                className="flex w-full items-center justify-center gap-2 rounded-xl bg-gold py-3 text-sm font-semibold text-black transition-all hover:bg-gold-light hover:shadow-lg hover:shadow-gold/20 cursor-pointer disabled:opacity-50"
+              >
+                <Send size={15} />
+                {submitting ? "Записываем..." : "Записаться"}
+              </button>
+            </form>
+          </>
+        )}
+      </div>
+    </div>,
+    document.body
+  );
+}

src/components/ui/SignupModal.tsx

@@ -0,0 +1,264 @@
+"use client";
+
+import { useState, useEffect, useCallback } from "react";
+import { createPortal } from "react-dom";
+import { X, CheckCircle, Send, Phone as PhoneIcon, Instagram } from "lucide-react";
+import { BRAND } from "@/lib/constants";
+
+interface SignupModalProps {
+  open: boolean;
+  onClose: () => void;
+  title?: string;
+  subtitle?: string;
+  /** API endpoint to POST to */
+  endpoint: string;
+  /** Extra fields merged into the POST body (e.g. masterClassTitle, classId, eventId, groupInfo) */
+  extraBody?: Record<string, unknown>;
+  /** Custom success message */
+  successMessage?: string;
+  /** Callback with API response data on success */
+  onSuccess?: (data: Record<string, unknown>) => void;
+}
+
+export function SignupModal({
+  open,
+  onClose,
+  title = "Записаться",
+  subtitle,
+  endpoint,
+  extraBody,
+  successMessage,
+  onSuccess,
+}: SignupModalProps) {
+  const [name, setName] = useState("");
+  const [phone, setPhone] = useState("+375 ");
+  const [instagram, setInstagram] = useState("");
+  const [telegram, setTelegram] = useState("");
+  const [submitting, setSubmitting] = useState(false);
+  const [error, setError] = useState("");
+  const [success, setSuccess] = useState(false);
+  const [successData, setSuccessData] = useState<Record<string, unknown> | null>(null);
+
+  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);
+  }
+
+  useEffect(() => {
+    if (!open) return;
+    function onKey(e: KeyboardEvent) {
+      if (e.key === "Escape") onClose();
+    }
+    document.addEventListener("keydown", onKey);
+    return () => document.removeEventListener("keydown", onKey);
+  }, [open, onClose]);
+
+  useEffect(() => {
+    if (open) document.body.style.overflow = "hidden";
+    else document.body.style.overflow = "";
+    return () => { document.body.style.overflow = ""; };
+  }, [open]);
+
+  const handleSubmit = useCallback(async (e: React.FormEvent) => {
+    e.preventDefault();
+    setError("");
+
+    const cleanPhone = phone.replace(/\D/g, "");
+    if (cleanPhone.length < 12) {
+      setError("Введите корректный номер телефона");
+      return;
+    }
+
+    setSubmitting(true);
+    try {
+      const body: Record<string, unknown> = {
+        name: name.trim(),
+        phone: cleanPhone,
+        ...extraBody,
+      };
+      if (instagram.trim()) body.instagram = `@${instagram.trim()}`;
+      if (telegram.trim()) body.telegram = `@${telegram.trim()}`;
+
+      const res = await fetch(endpoint, {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify(body),
+      });
+      const data = await res.json();
+      if (!res.ok) {
+        setError(data.error || "Ошибка при записи");
+        return;
+      }
+      setSuccess(true);
+      setSuccessData(data);
+      onSuccess?.(data);
+    } catch {
+      setError("network");
+    } finally {
+      setSubmitting(false);
+    }
+  }, [name, phone, instagram, telegram, endpoint, extraBody, onSuccess]);
+
+  const handleClose = useCallback(() => {
+    onClose();
+    setTimeout(() => {
+      setName("");
+      setPhone("+375 ");
+      setInstagram("");
+      setTelegram("");
+      setError("");
+      setSuccess(false);
+      setSuccessData(null);
+    }, 300);
+  }, [onClose]);
+
+  function openInstagramDM() {
+    const text = `Здравствуйте! Меня зовут ${name}. Хочу записаться${subtitle ? ` (${subtitle})` : ""}. Мой телефон: ${phone}`;
+    window.open(`https://ig.me/m/blackheartdancehouse?text=${encodeURIComponent(text)}`, "_blank");
+    handleClose();
+  }
+
+  if (!open) return null;
+
+  return createPortal(
+    <div className="modal-overlay fixed inset-0 z-50 flex items-center justify-center p-4" onClick={handleClose}>
+      <div className="absolute inset-0 bg-black/70 backdrop-blur-sm" />
+      <div
+        className="modal-content relative w-full max-w-md rounded-2xl border border-white/[0.08] bg-[#0a0a0a] p-6 sm:p-8 shadow-2xl"
+        onClick={(e) => e.stopPropagation()}
+      >
+        <button
+          onClick={handleClose}
+          className="absolute right-4 top-4 flex h-8 w-8 items-center justify-center rounded-full text-neutral-500 transition-colors hover:bg-white/[0.06] hover:text-white cursor-pointer"
+        >
+          <X size={18} />
+        </button>
+
+        {success ? (
+          <div className="py-4 text-center">
+            <div className="mx-auto mb-4 flex h-14 w-14 items-center justify-center rounded-full bg-emerald-500/10">
+              <CheckCircle size={28} className="text-emerald-500" />
+            </div>
+            <h3 className="text-lg font-bold text-white">
+              {successMessage || "Вы записаны!"}
+            </h3>
+            {subtitle && <p className="mt-1 text-sm text-neutral-400">{subtitle}</p>}
+            {successData?.totalBookings !== undefined && (
+              <p className="mt-3 text-sm text-white">
+                Вы записаны на <span className="text-gold font-semibold">{String(successData.totalBookings)}</span> занятий.
+                <br />
+                Стоимость: <span className="text-gold font-semibold">{String(successData.pricePerClass)} BYN</span> за занятие
+              </p>
+            )}
+            <button
+              onClick={handleClose}
+              className="mt-6 rounded-full bg-gold px-6 py-2.5 text-sm font-semibold text-black transition-all hover:bg-gold-light cursor-pointer"
+            >
+              Закрыть
+            </button>
+          </div>
+        ) : error === "network" ? (
+          /* Network error — fallback to Instagram DM */
+          <div className="py-4 text-center">
+            <div className="mx-auto mb-4 flex h-14 w-14 items-center justify-center rounded-full bg-amber-500/10">
+              <Instagram size={28} className="text-amber-400" />
+            </div>
+            <h3 className="text-lg font-bold text-white">Что-то пошло не так</h3>
+            <p className="mt-2 text-sm text-neutral-400">
+              Не удалось отправить заявку. Свяжитесь с нами через Instagram — мы запишем вас!
+            </p>
+            <button
+              onClick={openInstagramDM}
+              className="mt-5 flex w-full items-center justify-center gap-2 rounded-xl bg-gradient-to-r from-purple-600 to-pink-500 py-3 text-sm font-semibold text-white transition-all hover:opacity-90 cursor-pointer"
+            >
+              <Instagram size={16} />
+              Написать в Instagram
+            </button>
+            <button
+              onClick={() => setError("")}
+              className="mt-2 text-xs text-neutral-500 hover:text-white transition-colors cursor-pointer"
+            >
+              Попробовать снова
+            </button>
+          </div>
+        ) : (
+          <>
+            <div className="mb-6">
+              <h3 className="text-xl font-bold text-white">{title}</h3>
+              {subtitle && <p className="mt-1 text-sm text-neutral-400">{subtitle}</p>}
+            </div>
+
+            <form onSubmit={handleSubmit} className="space-y-3">
+              <input
+                type="text"
+                value={name}
+                onChange={(e) => setName(e.target.value)}
+                placeholder="Ваше имя"
+                required
+                className="w-full rounded-xl border border-white/[0.08] bg-white/[0.04] px-4 py-3 text-sm text-white placeholder-neutral-500 outline-none transition-colors focus:border-gold/40 focus:bg-white/[0.06]"
+              />
+              <div className="relative">
+                <PhoneIcon size={14} className="absolute left-3 top-1/2 -translate-y-1/2 text-neutral-500" />
+                <input
+                  type="tel"
+                  value={phone}
+                  onChange={(e) => handlePhoneChange(e.target.value)}
+                  placeholder="+375 (__) ___-__-__"
+                  required
+                  className="w-full rounded-xl border border-white/[0.08] bg-white/[0.04] pl-9 pr-4 py-3 text-sm text-white placeholder-neutral-500 outline-none transition-colors focus:border-gold/40 focus:bg-white/[0.06]"
+                />
+              </div>
+              <div className="grid grid-cols-2 gap-2">
+                <div className="relative">
+                  <span className="absolute left-3 top-1/2 -translate-y-1/2 text-neutral-500 text-xs">@</span>
+                  <input
+                    type="text"
+                    value={instagram}
+                    onChange={(e) => setInstagram(e.target.value.replace(/^@/, ""))}
+                    placeholder="Instagram"
+                    className="w-full rounded-xl border border-white/[0.08] bg-white/[0.04] pl-7 pr-3 py-3 text-sm text-white placeholder-neutral-500 outline-none transition-colors focus:border-gold/40 focus:bg-white/[0.06]"
+                  />
+                </div>
+                <div className="relative">
+                  <span className="absolute left-3 top-1/2 -translate-y-1/2 text-neutral-500 text-xs">@</span>
+                  <input
+                    type="text"
+                    value={telegram}
+                    onChange={(e) => setTelegram(e.target.value.replace(/^@/, ""))}
+                    placeholder="Telegram"
+                    className="w-full rounded-xl border border-white/[0.08] bg-white/[0.04] pl-7 pr-3 py-3 text-sm text-white placeholder-neutral-500 outline-none transition-colors focus:border-gold/40 focus:bg-white/[0.06]"
+                  />
+                </div>
+              </div>
+
+              {error && error !== "network" && (
+                <p className="text-sm text-red-400">{error}</p>
+              )}
+
+              <button
+                type="submit"
+                disabled={submitting}
+                className="flex w-full items-center justify-center gap-2 rounded-xl bg-gold py-3 text-sm font-semibold text-black transition-all hover:bg-gold-light hover:shadow-lg hover:shadow-gold/20 cursor-pointer disabled:opacity-50"
+              >
+                <Send size={15} />
+                {submitting ? "Записываем..." : "Записаться"}
+              </button>
+            </form>
+          </>
+        )}
+      </div>
+    </div>,
+    document.body
+  );
+}