Add Chat to Remote Support Sessions

Tinker

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Description

## Overview
Add real-time text chat capability to remote support sessions, enabling operators and guests to exchange messages alongside the video call.

## Architecture Decisions
1. **Chat Model**: Session-scoped chat - each `SupportSession` has its own message stream via a new `SupportSessionMessage` model
2. **Persistence**: Messages are persisted for audit and review after session ends
3. **Guest Transport**: WebSocket fallback endpoint for unauthenticated guest subscriptions (guests have no NATS device)
4. **UI Placement**: Collapsible panel alongside video in both operator and guest interfaces

## Key Challenges
- Guest is unauthenticated (no `User` record) - messages need `participant_type` field
- Guest cannot use NATS (no device context) - requires dedicated WebSocket/SSE endpoint
- Must work with existing Daily.co video infrastructure
- Chat should remain accessible after session ends (for operators reviewing history)

## Success Criteria
- [ ] Operators can send/receive messages during active sessions
- [ ] Guests can send/receive messages without authentication
- [ ] Messages persist and are viewable after session ends
- [ ] Real-time delivery with minimal latency
- [ ] Consistent collapsible panel UI on both sides