fix: WCAG 2.2.2 hero autoplay pause control, invisible keyboard-focusable cart button, literal hex token

- Hero widget autoplay had no pause control and ignored
  prefers-reduced-motion (WCAG 2.2.2 requires a way to pause
  auto-updating content lasting >5s). Added a pause/resume toggle
  button and skip autoplay entirely when the OS prefers reduced motion.
- Cart's swipe-reveal delete-btn-mobile was reachable by Tab even
  while invisible (opacity: 0, only the touch-swipe gesture could
  reveal it) - a confusing, unusable focus stop for keyboard users.
  Now tabindex=-1 + aria-hidden until swiped. Keyboard users already
  had a full removal path via the always-visible header remove button;
  this just stops the redundant hidden button from being a dead tab
  stop.
- stars.component.scss hardcoded #cdd6d5 for the unfilled-star color
  instead of the --border-color design token.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/app/i18n/ru.ts

@@ -1129,6 +1129,8 @@ export const ru: Translations = {
     nextProducts: 'Следующие товары',
     previousSlide: 'Предыдущий слайд',
     nextSlide: 'Следующий слайд',
+    pauseAutoplay: 'Приостановить слайд-шоу',
+    resumeAutoplay: 'Возобновить слайд-шоу',
     closeDialog: 'Закрыть диалог',
     dismiss: 'Скрыть',
     qrCode: 'QR-код',