docs(06-02): complete react architecture design plan
Phase 6 Plan 2 complete - React architecture designed for Phases 7-11:
Summary:
- All 3 tasks completed successfully
- 3 design documents created (3,224 lines total)
- Component architecture, Redux state, and implementation roadmap ready
- Phase 6 complete, ready for Phase 7
Design Documents Created:
- CHAT_COMPONENT_DESIGN.md (954 lines): 8 components, WindowPortal integration, auto-scroll logic
- CHAT_REDUX_DESIGN.md (1,132 lines): sessionChatSlice, 3 async thunks, 8 selectors, WebSocket integration
- IMPLEMENTATION_ROADMAP.md (1,138 lines): 11-13 plans for Phases 7-11, risk analysis, TDD strategy
Key Architectural Decisions:
- Component hierarchy: JKSessionChatWindow (WindowPortal) with 6 sub-components
- Props vs Redux: Heavy Redux usage (minimal props)
- Auto-scroll: Track isUserScrolling, disable when scrolled up
- Multi-channel state: messagesByChannel keyed by channel ID
- Read/unread tracking: Client-side with localStorage (NEW functionality)
- Message deduplication: By msg_id in Redux reducer
- WebSocket integration: CHAT_MESSAGE handler in useSessionWebSocket
Redux Architecture:
- sessionChatSlice (new): 7 reducers, 3 async thunks, 8 memoized selectors
- Reducers: addMessageFromWebSocket, openChatWindow, markAsRead, etc.
- Thunks: fetchChatHistory, sendMessage, markMessagesAsRead (future)
- Selectors: selectChatMessages, selectUnreadCount, selectTotalUnreadCount, etc.
Implementation Roadmap (Phases 7-11):
- Phase 7: Chat Infrastructure (3 plans) - Redux, API, WebSocket
- Phase 8: Chat UI (3 plans) - Window, MessageList, Button
- Phase 9: Message Composition (2 plans) - Composer, Send/Receive
- Phase 10: Read/Unread Tracking (2 plans) - Badge, Channel Switching
- Phase 11: Finalization (3 plans) - Error Handling, Performance, UAT
Risk Analysis:
- 2 HIGH: WebSocket deduplication, localStorage persistence
- 4 MEDIUM: Auto-scroll, multi-tab sync, API errors, WindowPortal styling
- 2 LOW: Character count, timestamp formatting
TDD Strategy:
- Phase 7: 100% TDD (data layer)
- Phase 8-10: 50-100% TDD (behavior)
- Phase 11: 70% TDD (error handling)
Testing Strategy:
- Unit tests: 80%+ coverage (Redux, API, WebSocket)
- Integration tests: 7 test files (window, send, receive, badge, scroll, channel, errors)
- E2E tests: Complete workflow + multi-user
- UAT: 40+ test cases across 9 categories
Deferred Features (Next Milestone):
- Server-side read/unread tracking
- File attachments
- Message search/filtering
- Message editing/deletion
- Typing indicators
- Emoji picker
- Multi-channel tabs
- Notification sounds
- Desktop notifications
Updated STATE.md and ROADMAP.md to reflect Phase 6 completion.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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