The admin.landings namespace had two 'purchases' keys at the same level:
a string for purchase count label and an object for purchases section.
JSON last-key-wins caused the string to be overwritten by the object,
producing "returned an object instead of string" error on landings list.
Add discount configuration in admin editor and countdown timer
display on public purchase page.
- Add discount section to AdminLandingEditor with toggle, percent
slider, datetime pickers, per-tariff overrides, live preview
- Add DiscountBanner with countdown timer to QuickPurchase page
using AnimatePresence exit animation and proper interval cleanup
- Add strikethrough prices and discount badges to tariff cards,
summary card and pay button with null/equality guards
- Add discount translations for ru and en locales
- Fix delete/toggle API return types to match backend contracts
- Fix isoToDatetimeLocal to preserve seconds on re-edit
- Fix preview rounding to match backend integer division
- Badges (active/inactive, gift) now wrap on narrow screens
- Action buttons move to a separate row on mobile (hidden/shown via sm:)
- Delete button pushed to the right on mobile for safety
- Reduced padding and gaps on small screens
- Desktop layout unchanged
- Update LandingListItem.title type to LocaleDict
- Add resolveLocaleDisplay() helper for extracting display string
- Use resolveLocaleDisplay() in landing list and delete confirm
- QuickPurchase: публичная страница покупки с выбором тарифа/периода/оплаты
- PurchaseSuccess: статус покупки с поллингом и копированием ссылки
- AdminLandings: управление лендингами (создание, сортировка, удаление)
- AdminLandingEditor: полнофункциональный редактор лендинга
- API-клиент landings.ts для всех эндпоинтов
- Роутинг /buy/:slug и /buy/success/:token
- Локализация ru/en/zh/fa для всех текстов лендинга
- Санитизация HTML/CSS, rate limit защита, DOMPurify
