fix(ui): hide cursor completely on touchscreen kiosk

Replace cursor: default (which showed pointer on buttons) with
cursor: none !important on all elements. Touchscreen ATMs don't
need a visible cursor — taps register via touch coordinates.

Reverts the earlier cursor: default addition and fixes the
pre-existing issue of pointer cursor showing over buttons.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/machine/src/style.css

@@ -1,10 +1,11 @@
 @import 'tailwindcss';
 @import 'tw-animate-css';
 
-/* Force cursor visible everywhere (kiosk mode with external mouse/touchscreen) */
-html,
-body {
-  cursor: default;
+/* Hide cursor completely on touchscreen kiosk */
+*,
+*::before,
+*::after {
+  cursor: none !important;
 }
 
 /* Ubuntu font family (self-hosted for offline kiosk) */