batch waiting cue: move the contact pad to the bottom edge

The card's contact pad sat mid-card; it now sits near the bottom edge,
away from the top-right cut corner (the cut side is the card's top).
No other geometry or animation changes.

1024 Python + 1063 frontend; simple-v473.

CHANGELOG.md

@@ -21,7 +21,7 @@ every change carries a descriptive commit message.
   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 card follows the app's SIM silhouette (`sim.svg`): a cut corner
-  and the contact pad, sliding behind the reader bar.
+  at the top and the contact pad near the bottom edge, sliding behind the reader bar.
 
 ### Changed