Messaging UI Integration

[chazdj]

Priority: Medium

Story Points: 5

Parent Epic: #73

Description

Adds real project communication interface.

Requirements

• thread view inside project details
• send box
• sender alignment
• timestamps
• auto-refresh polling
• empty state UI

Acceptance Criteria

• users can send/receive in UI
• thread persists after refresh
• messages display in correct order
• unauthorized users cannot access chat route

Definition of Done

• Message model + relationship
• router endpoints
• permission dependency
• API unit tests
• E2E workflow test
• docs updated