localStorage key: the active org brand overlay's emitted CSS, as JSON { id, css }.
The overlay stylesheet is a Blob URL that does not survive a reload, so without this
the loading screen and the sign-in page painted MJ's default tokens until bootstrap
re-emitted the overlay at the end of workspace init. Only honored when id matches
PRELOAD_OVERLAY_KEY; bootstrap's real <link> replaces the preloaded <style>.
localStorage key: the active org brand overlay's emitted CSS, as JSON
{ id, css }. The overlay stylesheet is a Blob URL that does not survive a reload, so without this the loading screen and the sign-in page painted MJ's default tokens until bootstrap re-emitted the overlay at the end of workspace init. Only honored whenidmatches PRELOAD_OVERLAY_KEY; bootstrap's real<link>replaces the preloaded<style>.