feat: centralize popup texts in new admin tab /admin/popups

- New admin page for shared popup texts (success, waiting list, error, Instagram hint)
- Removed popup fields from MC and Open Day admin editors
- All SignupModals now read from centralized popups config
- Stored as "popups" section in DB with fallback defaults

src/components/sections/MasterClasses.tsx

@@ -11,6 +11,7 @@ import type { SiteContent, MasterClassItem, MasterClassSlot } from "@/types";
 interface MasterClassesProps {
   data: SiteContent["masterClasses"];
   regCounts?: Record<string, number>;
+  popups?: SiteContent["popups"];
 }
 
 const MONTHS_RU = [
@@ -217,7 +218,7 @@ function MasterClassCard({
   );
 }
 
-export function MasterClasses({ data, regCounts = {} }: MasterClassesProps) {
+export function MasterClasses({ data, regCounts = {}, popups }: MasterClassesProps) {
   const [signupTitle, setSignupTitle] = useState<string | null>(null);
 
   const upcoming = useMemo(() => {
@@ -278,8 +279,10 @@ export function MasterClasses({ data, regCounts = {} }: MasterClassesProps) {
         subtitle={signupTitle ?? ""}
         endpoint="/api/master-class-register"
         extraBody={{ masterClassTitle: signupTitle }}
-        successMessage={data.successMessage}
-        waitingMessage={data.waitingListText}
+        successMessage={popups?.successMessage}
+        waitingMessage={popups?.waitingListText}
+        errorMessage={popups?.errorMessage}
+        instagramHint={popups?.instagramHint}
       />
     </section>
   );

src/components/sections/OpenDay.tsx

@@ -6,12 +6,14 @@ import { SectionHeading } from "@/components/ui/SectionHeading";
 import { Reveal } from "@/components/ui/Reveal";
 import { SignupModal } from "@/components/ui/SignupModal";
 import type { OpenDayEvent, OpenDayClass } from "@/lib/openDay";
+import type { SiteContent } from "@/types";
 
 interface OpenDayProps {
   data: {
     event: OpenDayEvent;
     classes: OpenDayClass[];
   };
+  popups?: SiteContent["popups"];
 }
 
 function formatDateRu(dateStr: string): string {
@@ -23,7 +25,7 @@ function formatDateRu(dateStr: string): string {
   });
 }
 
-export function OpenDay({ data }: OpenDayProps) {
+export function OpenDay({ data, popups }: OpenDayProps) {
   const { event, classes } = data;
   const [signup, setSignup] = useState<{ classId: number; label: string } | null>(null);
 
@@ -132,8 +134,10 @@ export function OpenDay({ data }: OpenDayProps) {
           subtitle={signup.label}
           endpoint="/api/open-day-register"
           extraBody={{ classId: signup.classId, eventId: event.id }}
-          successMessage={event.successMessage}
-          waitingMessage={event.waitingListText}
+          successMessage={popups?.successMessage}
+          waitingMessage={popups?.waitingListText}
+          errorMessage={popups?.errorMessage}
+          instagramHint={popups?.instagramHint}
         />
       )}
     </section>

src/components/ui/SignupModal.tsx

@@ -18,6 +18,10 @@ interface SignupModalProps {
   successMessage?: string;
   /** Custom waiting list message */
   waitingMessage?: string;
+  /** Custom error message */
+  errorMessage?: string;
+  /** Custom Instagram hint text */
+  instagramHint?: string;
   /** Callback with API response data on success */
   onSuccess?: (data: Record<string, unknown>) => void;
 }
@@ -31,6 +35,8 @@ export function SignupModal({
   extraBody,
   successMessage,
   waitingMessage,
+  errorMessage,
+  instagramHint,
   onSuccess,
 }: SignupModalProps) {
   const [name, setName] = useState("");
@@ -167,7 +173,7 @@ export function SignupModal({
                   className="mt-3 inline-flex items-center gap-1.5 text-sm text-pink-400 hover:text-pink-300"
                 >
                   <Instagram size={14} />
-                  По вопросам пишите в Instagram
+                  {instagramHint || "По вопросам пишите в Instagram"}
                 </a>
               </>
             ) : (
@@ -190,7 +196,7 @@ export function SignupModal({
             </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!
+              {errorMessage || "Не удалось отправить заявку. Свяжитесь с нами через Instagram — мы запишем вас!"}
             </p>
             <button
               onClick={openInstagramDM}