DevPlugin (native + TS) lets the running app switch its webview to a
Vite dev server via DEV_URL, toggled from a hidden DevMenu (5 taps on
the app title).
Checked-in android/ Capacitor project plus the native TiptoiPlugin
(Kotlin): SAF directory picker for the pen, listing/copying/deleting
.gme files on the pen, and downloading GME/cover files into
app-private storage.
arnef