Follow-on to the visibility fix in this PR — hero_logo_size had the same
split-brain: GalleryLayout read the global branding_logo_size live while
the hero-header path used the per-event snapshot, so a hero logo could
render at different sizes on different layouts and the global size didn't
reach hero-header galleries.
Now mirrored on the visibility model: NULL per-event hero_logo_size =
inherit branding_logo_size; explicit = override.
- Migration 153: hero_logo_size nullable + backfill NULL so existing
galleries inherit the global size (restores GalleryLayout's prior
live-global behaviour and fixes the hero-header staleness).
- Creation stores NULL unless explicit; gallery.js resolves
per-event ?? global and sends the effective size.
- GalleryLayout now consumes that resolved size for the hero logo (new
heroLogoSize prop) instead of the global — both render paths match.
- Admin size control gains a 'Use branding default' (inherit) option.
Verified: migration on SQLite + PG; live resolution (inherit follows
global both ways, override wins); creation stores NULL on PG; tsc clean,
106 adminEvents+gallery tests pass, build green.
Paul Nothaft
60b03b1728