Assets (ROMs and disk images) now live in getExternalFilesDir, making
them accessible via USB file transfer and any file manager app without
adb or root.
- "Import ROMs" button walks through kernal/basic/chargen picks in
sequence and restarts the emulator when done
- "Import Disks" button opens a multi-select picker; files are saved
as SCHWUM<N><P>.D64 (uppercased for consistent lookup)
- 2×4 episode grid (1A–4B) lights up each button as its disk image
becomes available; tapping loads that disk into drive 8
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