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.

CHANGELOG.md

@@ -20,7 +20,8 @@ every change carries a descriptive commit message.
   title hints "Insert next card".  The speaker button next to the status mutes the chime
   and the choice is remembered (`simple_ram_batch_sound`); the chime is unlocked by the
   Start click (browser autoplay policy); reduced-motion users get the static card-above-
-  the-slot picture.
+  the-slot picture.  The card follows the app's SIM silhouette (`sim.svg`): a cut corner
+  and the contact pad, sliding behind the reader bar.
 
 ### Changed