Logo upload and delete need change rights on Global (was read rights,
which BizAdminRestricted has). The image type is taken from the bytes:
PNG, JPEG, GIF, WebP or SVG, anything else refused; the claimed type is
not stored. Downloads send nosniff and a sandbox Content-Security-Policy,
so an SVG opened by its URL runs no script. F23 fixed (4727 step 1).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
