Introduce global, page, and section-level error handling for the
compliance portal so a failure is contained at the smallest possible
scope instead of blanking the whole page.
Add a portal-local Relay fetch that throws only request-level errors
(and always redirects on UNAUTHENTICATED) while leaving field-level
errors in the response, so Relay surfaces them at the reading component
through @throwOnFieldError and the nearest boundary. Add a NotFoundError
for node __typename mismatches mapped to a not-found page.
Ship reusable v2 kit primitives (ErrorBoundary, ErrorState, InlineError)
matching the Figma global/local/inline designs, wire the bootstrap and
route boundaries, and demonstrate section and row boundaries on the home
page. Update the error-handling and relay guides accordingly.
Signed-off-by: Émile Ré <emile@probo.com>