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feat(chat): implement real-time chat system for human-agent collaboration (#49)

Implements Issue #12 - Real-time chat system with:

**ChatService** (src/services/chat/):
- Thread management (create, delete, pin, mark as read)
- Message handling with streaming support
- Approval workflow (request/respond)
- Search across threads
- Event system for real-time updates
- Typing indicators
- Abort/cancel support for long-running requests

**UI Components** (src/components/chat/):
- ChatMessage: Renders messages with support for text, code, and approval types
- ChatThread: Scrollable message list with auto-scroll and typing indicators
- ChatInput: Input field with send functionality
- ThreadList: Thread list with pinned/recent sections and unread badges
- ApprovalCard: Action approval UI with approve/reject buttons
- CodeBlock: Code display with language header and copy functionality

**Tests**:
- 129 total tests passing (8 test suites)
- Comprehensive ChatService tests covering all functionality

All components follow ThumbCode brand guidelines with organic daube styling.

Closes #12

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

181 of 616 branches covered (29.38%)

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495 of 949 relevant lines covered (52.16%)

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