Restyle the RZ Coin Shop screen as a card grid

Replaces the plain title/list layout with a header, a coin-balance
summary card, and a product card grid (icon, description, price,
solid Buy button) matching the app's existing card/badge visual
language. Only the two real products render - no fabricated
categories or bundles, since the backend doesn't have that data yet.

assets/icons/lucide/rotate-ccw.svg

@@ -0,0 +1,14 @@
+<svg
+  xmlns="http://www.w3.org/2000/svg"
+  width="24"
+  height="24"
+  viewBox="0 0 24 24"
+  fill="none"
+  stroke="#ffffff"
+  stroke-width="2"
+  stroke-linecap="round"
+  stroke-linejoin="round"
+>
+  <path d="M3 12a9 9 0 1 0 9-9 9.75 9.75 0 0 0-6.74 2.74L3 8" />
+  <path d="M3 3v5h5" />
+</svg>