Missing splash screen during boot

[eliasbakken]

Problem

No splash screen is shown during boot on Recore. Suspect this is related to Plymouth - rebuild.sh copies a custom watermark into the plymouth-theme-armbian package (cp armbian/watermark.png "${BUILD_DIR}"/packages/plymouth-theme-armbian/watermark.png), but the splash doesn't actually appear on screen during boot.

Notes for investigation

• Confirm Plymouth is actually enabled/started at boot (kernel cmdline splash param, initramfs hook, plymouth.service state).
• Confirm the theme with the custom watermark is the one actually selected/active, not just present in the package.
• Check whether this ever worked, or has been broken since the watermark customization was added.