fix(ui): kiosk dropdown flash + never inherit the OS light theme

Outside-close listeners move from click to pointerdown: pointerdown
fires before the open-toggle re-render, so the kiosk's slow software
compositing can no longer detach the click target mid-flight and close
the menu the instant it opens. color-scheme:dark (CSS + meta) pins every
native control — select popups, scrollbars, pickers — dark regardless of
the user's OS theme; explicit select/option colors cover Firefox.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

neode-ui/src/components/AppSwitcher.vue

@@ -104,11 +104,11 @@ function handleClickOutside(e: MouseEvent) {
 }
 
 onMounted(() => {
-  document.addEventListener('click', handleClickOutside)
+  document.addEventListener('pointerdown', handleClickOutside)
 })
 
 onBeforeUnmount(() => {
-  document.removeEventListener('click', handleClickOutside)
+  document.removeEventListener('pointerdown', handleClickOutside)
 })
 </script>