fix(ui): force cursor visible on all elements in kiosk mode

Electron hides the cursor over non-interactive elements when running
without a desktop environment. Add cursor: default to html/body so
the mouse pointer is always visible when using an external mouse or
touchscreen.

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

apps/machine/src/style.css

@@ -1,6 +1,12 @@
 @import 'tailwindcss';
 @import 'tw-animate-css';
 
+/* Force cursor visible everywhere (kiosk mode with external mouse/touchscreen) */
+html,
+body {
+  cursor: default;
+}
+
 /* Ubuntu font family (self-hosted for offline kiosk) */
 @font-face {
   font-family: 'Ubuntu';