The sidebar card badged 'Private chat - On' while the MLS tab said 'not created
yet', and led with external apps. Rewrote CrewCoordinatorCard to show two
explicit rows (Chat = NIP-17 always on; Private chat = MLS with real status) and
make the in-app chat the primary CTA (?tab=mls); demoted Cordn web / Staircase
under 'Open in another app'. Panel now gives join feedback + an admin invite
hint. Adds CORDN_UX_AUDIT.md (findings, terminology model, deferred items).
