v0.26.1 — team pickers list your teams, not folder names

Fixed

• The Record tab's team selector (and the upload review / Outbox / move
  pickers) offered local folder names as teams: a session folder sitting
  directly in ~/vezir-meetings/ (an old vezir pull that couldn't resolve
  its team) showed up as a "team" called meeting-…_TITLE. Pickers now list
  only teams you're a member of (memberships + teams.json), and a folder
  named like a session is never treated as a team root.
• The team selector no longer shows a blank "team" entry when a team is
  known.

Client-only; no server change. Suite: 1304 (1 new).