- Add marketing_channel_id to broadcasts table
- Create Campaign views (index, create, edit, show) with modern UX
- Implement test send functionality with provider abstraction
- Create Conversations data model (conversations, participants, messages)
- Create Messaging inbox UI with conversation threads
- Link broadcast sends to conversation system
- Add Marketing nav section (premium feature, gated by has_marketing flag)
- Update BroadcastController with sendTest method
- Create MessagingController with conversation management
- Add SMS provider support (Twilio, Telnyx, Cannabrands)
- Create comprehensive platform naming and style guide
Phase 9 Complete: Full campaign management UX
Phase 10 Complete: Messaging foundation ready for two-way communication
5bbc740962