/admin/branding now accepts two logo uploads: the existing one (now labelled Dark Theme — default) and a new Light Theme variant.
- Config keys:
general.site_logo+ newgeneral.site_logo_light. Unset = fall back to the dark one. - Only the
lighttheme picks the light variant. crt-green, crt-amber, c64, vt100 all stay on dark. Mobile is forced to light so the light variant kicks in there too. - Each card previews on a theme-appropriate background (dark card on
#111, light card on#fff) so contrast issues are obvious before you save. - Navbar swap is synchronous pre-paint — no flash, no extra fetch on the initial render.
- Canonical logo (JSON-LD schema, OG image, Twitter card) stays on the dark variant since those are crawler-facing.
PNG alpha-channel warning
Uploads are checked for a real alpha channel. If a PNG comes in as color-type 2 (RGB) — typical symptom of an image editor flattening its transparency-preview checkerboard into the export — the upload still saves but a warning flash spells out the fix: re-export with alpha preserved (Photoshop "PNG-24 with transparency" / GIMP "Save transparent pixels").
