feat: discount toggle flag, hide price from success popup

- Admin: "Добавить скидку" toggle — OFF hides discount fields and sets to 0
- Public: discount line hidden when discountPrice=0
- Success popup: removed price/booking count info

src/app/admin/open-day/page.tsx

@@ -2,7 +2,7 @@
 
 import { useState, useEffect, useMemo, useCallback } from "react";
 import {
-  Plus, X, Loader2, Calendar, Trash2, Ban, CheckCircle2, RotateCcw,
+  Plus, X, Loader2, Calendar, Trash2, Ban, CheckCircle2, RotateCcw, Sparkles,
 } from "lucide-react";
 import { adminFetch } from "@/lib/csrf";
 import { ParticipantLimits } from "../_components/FormField";
@@ -100,16 +100,35 @@ function EventSettings({
         />
       </div>
 
-      <div className="grid gap-4 sm:grid-cols-3">
       <div>
         <label className="block text-sm text-neutral-400 mb-1.5">Цена за занятие (BYN)</label>
         <input
           type="number"
           value={event.pricePerClass}
           onChange={(e) => onChange({ pricePerClass: parseInt(e.target.value) || 0 })}
-            className="w-full rounded-lg border border-white/10 bg-neutral-800 px-4 py-2.5 text-white outline-none focus:border-gold transition-colors"
+          className="w-full rounded-lg border border-white/10 bg-neutral-800 px-4 py-2.5 text-white outline-none focus:border-gold transition-colors sm:max-w-xs"
         />
       </div>
+
+      {/* Discount toggle + fields */}
+      <div>
+        <button
+          type="button"
+          onClick={() => {
+            if (event.discountPrice > 0) onChange({ discountPrice: 0, discountThreshold: 0 });
+            else onChange({ discountPrice: event.pricePerClass - 5, discountThreshold: 3 });
+          }}
+          className={`flex items-center gap-2 rounded-full px-4 py-2 text-sm font-medium transition-all ${
+            event.discountPrice > 0
+              ? "bg-gold/15 text-gold border border-gold/30"
+              : "bg-neutral-800 text-neutral-400 border border-white/10 hover:text-white"
+          }`}
+        >
+          <Sparkles size={14} />
+          {event.discountPrice > 0 ? "Скидка включена" : "Добавить скидку"}
+        </button>
+        {event.discountPrice > 0 && (
+          <div className="grid gap-4 sm:grid-cols-2 mt-3">
             <div>
               <label className="block text-sm text-neutral-400 mb-1.5">Цена со скидкой (BYN)</label>
               <input
@@ -129,6 +148,8 @@ function EventSettings({
               />
             </div>
           </div>
+        )}
+      </div>
 
       <ParticipantLimits
         min={event.minBookings}
@@ -151,7 +172,7 @@ function EventSettings({
           {event.active ? "Опубликовано" : "Черновик"}
         </button>
         <span className="text-xs text-neutral-500">
-          {event.pricePerClass} BYN / занятие, от {event.discountThreshold} — {event.discountPrice} BYN
+          {event.pricePerClass} BYN / занятие{event.discountPrice > 0 && event.discountThreshold > 0 && `, от ${event.discountThreshold} — ${event.discountPrice} BYN`}
         </span>
       </div>
     </div>

src/components/sections/OpenDay.tsx

@@ -67,10 +67,12 @@ export function OpenDay({ data }: OpenDayProps) {
             <p className="text-lg font-semibold text-white">
               {event.pricePerClass} BYN <span className="text-neutral-400 font-normal text-sm">за занятие</span>
             </p>
+            {event.discountPrice > 0 && event.discountThreshold > 0 && (
               <p className="text-sm text-gold">
                 <Sparkles size={12} className="inline mr-1" />
                 От {event.discountThreshold} занятий — {event.discountPrice} BYN за каждое!
               </p>
+            )}
           </div>
         </Reveal>
 

src/components/ui/SignupModal.tsx

@@ -178,13 +178,6 @@ export function SignupModal({
                   {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