A trailing space from the portal's copy button reached WHOOP verbatim
and answered as an unknown client; the credential schema trims both
fields. The redirect override fell through nullish coalescing, so the
empty string the compose whitelist materialises for an unset var was
sent as the literal redirect target — empty now derives the callback
from the app URL.
Fill the WHOOP route set beside the OAuth connect/callback: status reports
connection + token expiry + backfill progress, disconnect revokes the stored
tokens and parks the integration, credentials saves/clears the per-user BYO
client id/secret encrypted at rest, sync triggers a manual incremental or full
pull. Add a WHOOP card to Settings -> Integrations mirroring the Withings card
(BYO-keys form, connect/disconnect, status pill, last-sync, backfill notice)
and surface whoop rows in the combined integrations-status envelope so the pill
reflects real failure state. WHOOP lives under the existing integrations
section -- no new slug.