/no-such-project-xyz/some/file.md used to redirect to whichever project the
fallback chain picked, dropping the path — nothing on screen distinguished
"that link is wrong" from "you opened your project."
An unknown route.project now renders a "Project not found" panel at the URL
as typed, mirroring the org-not-found page two blocks up: shell, sidebar and
account bar stay mounted, and "Back to <name>" points at the same project the
fallback picks today. The fallback chain itself is unchanged, and "/" still
redirects to the remembered project (BEA-75).
All four redirects below the flag rewrite the address bar off current.id, so
they are gated together — /bad-id/insights and /bad-id/notes/ would otherwise
undo the fix on their own.
Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
