batch waiting cue: use the app's SIM silhouette for the card

Redraw the inline card-into-reader SVG after sim.svg: a rounded card
with the top-right cut corner and the 3x2 contact pad, sliding behind
the reader bar.  The viewBox grew to 72x48 and the resting position is
0, so the card is no longer clipped at the top; the insert slide is
20px.  The currentColor/Tailwind theming and the reduced-motion
fallback are unchanged.

1024 Python + 1063 frontend; simple-v472.

frontend/style.css

@@ -1944,21 +1944,22 @@ video {
    rests above the slot. */
 
 .ram-insert-card {
-  transform: translateY(-14px);
+  /* the resting position is the card just above the slot (0); the insert
+     slide takes it 20px down, behind the reader front */
   animation: ram-insert 2.8s ease-in-out infinite;
 }
 
 @keyframes ram-insert {
   0%, 12% {
-    transform: translateY(-14px);
+    transform: translateY(0);
   }
 
   45%, 55% {
-    transform: translateY(10px);
+    transform: translateY(20px);
   }
 
   88%, 100% {
-    transform: translateY(-14px);
+    transform: translateY(0);
   }
 }