React Router routes render and loader errors to the route-level
boundaries, so the App-level boundary above the router could only catch
provider render failures — which today are trivial — while true bootstrap
failures throw at module load before it mounts. Neither console nor trust
wraps App this way.
Rely on the root route boundary instead and remove the BootstrapError
fallback it used.
Signed-off-by: Émile Ré <emile@probo.com>