- Team selector dropdown in MessageComposer (left of recipient selector)
- Cross-team mode locks recipient to team-lead, disables attachments
- Sender copy written to fromTeam inbox with source 'cross_team_sent'
- Purple accent styling for cross-team messages (incoming + outgoing)
- "from team-x" / "to team-x" badges in ActivityItem
- Strip [Cross-team from ...] prefix in UI (kept in stored text for CLI)
- CSS variables for cross-team theme (dark + light)
- Store: fetchCrossTeamTargets (all teams), sendCrossTeamMessage action
- Tests updated for sender copy and formatted text prefix