config/bootloaders was missing from the needs_full_build heavy-file
list, so changes to GRUB theme assets (e.g. bee-logo.png RGBA→RGB fix
in 333c44f) were silently skipped by the squashfs-surgery fast-path.
The old broken PNG stayed in boot/grub/live-theme/ inside the ISO.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>