Replace home hero with animated EHSAN banner carousel

Task #6: On artifacts/ehsan-poc home page, replaced the green text hero
with an auto-rotating, looping carousel of the four official ehsan.sa
banner images (Zakat, recurring/dawri, Waqf, gift) imported via @assets.

- Auto-advances every 5s, loops, and respects prefers-reduced-motion.
- Clickable dot indicators plus an accessible pause/play toggle (WCAG
  2.2.2) on a translucent backdrop pill.
- Bottom gradient scrim keeps the white CTA + controls readable on all
  four banner backgrounds.
- Removed the overlay heading, subtitle, and the "طلب دعم" button per the
  user; kept the "تصفّح الفرص" CTA linking to /opportunities.
- Added common.pause / common.play i18n keys (AR + EN) for the toggle.

Banners use alt="" (decorative) since the functional CTA is separately
labeled. Verified with tsc --noEmit and home-page screenshots (RTL).

artifacts/ehsan-poc/src/lib/i18n/translations.ts

@@ -28,6 +28,8 @@ export const en = {
     login: "Login",
     logout: "Logout",
     cart: "Cart",
+    pause: "Pause slideshow",
+    play: "Play slideshow",
   },
   nav: {
     home: "Home",
@@ -238,6 +240,8 @@ export const ar = {
     login: "تسجيل الدخول",
     logout: "تسجيل الخروج",
     cart: "السلة",
+    pause: "إيقاف العرض",
+    play: "تشغيل العرض",
   },
   nav: {
     home: "الرئيسية",