SpaceSidebar crashed with "Rendered more hooks than during the previous
render" because R3.6 added a useDisclosure() AFTER `if (!space) return`.
When `space` flipped from undefined (loading) to defined (loaded), the
hook count changed and React threw, triggering the Error Boundary and
blanking the page.
This single bug was the root cause of 5 reported failures (R4.7 smoke):
create page, sub-page, wikilink, /database, /template, /sync-block —
all blocked by the white screen.
Fix: hoist the hook above the conditional return. Hook order now stable.
Corentin
38f7d73e85