Phase 6: Interactive Chat with Claude (US4)

[jeremyeder]

Summary

Implements User Story 4: Interactive Chat with Claude for lightweight, ad-hoc questions without starting full AI sessions.

Key Features

• ✅ Interactive chat modal with persistent message history
• ✅ Optimistic UI updates with automatic retry on failure
• ✅ Contextual mock responses for development testing
• ✅ Auto-scroll to bottom and smooth keyboard handling
• ✅ Empty states, typing indicators, and loading states
• ✅ Single persistent conversation thread (Phase 6 MVP scope)

Implementation Details

Data Layer:

• ChatAPI service with intelligent mock responses (services/api/chat.ts)
• useChat hook with React Query + AsyncStorage persistence (hooks/useChat.ts)
• Auto-retry failed messages once before showing error

UI Components:

• ChatBubble: User/assistant messages with avatars and timestamps
• ChatInput: Multi-line input with send button (4000 char limit)
• ChatHeader: Status indicator and close button

Integration:

• Chat modal screen with full UX (app/chat.tsx)
• "Interactive" quick action button on Dashboard
• Modal navigation configuration in root layout

Bug Fixes:

• ✅ Fix back button showing "(tabs)" text (added headerBackTitleVisible: false)
• ✅ Add Header.displayName for linting compliance
• ✅ Escape quotes in ApprovalActions modal text

Testing

All 9 tasks complete (T056-T064):

• T056: Chat API service with mock data
• T057: useChat hook with React Query
• T058: ChatBubble component
• T059: ChatInput component
• T060: ChatHeader component
• T061: Chat modal screen
• T062: Dashboard "Interactive" button
• T063: Message send flow with optimistic updates
• T064: History loading from AsyncStorage

Test Plan

Manual Testing:

1. Launch app and navigate to Dashboard
2. Tap "Interactive" quick action button
3. Verify empty state displays correctly
4. Send a message about React Native/TypeScript/Expo
5. Verify contextual mock response appears
6. Send follow-up messages to test conversation context
7. Close and reopen modal to verify history persistence
8. Test keyboard handling on iOS/Android
9. Verify back buttons show only arrow icon (no text)

Automated:

• ✅ Linting passes (ESLint + Prettier)
• ✅ TypeScript compilation succeeds
• ✅ Pre-commit hooks successful

Future Enhancements (Phase 6.1+)

• Streaming responses using SSE (see .claude/skills/sse-react-query-sync/)
• Multi-thread conversation management
• Code block syntax highlighting
• Clear history functionality
• Image/file attachments

Files Changed

• New: app/chat.tsx, components/chat/*, hooks/useChat.ts, services/api/chat.ts
• Modified: app/_layout.tsx, app/(tabs)/index.tsx, app/sessions/_layout.tsx, components/ui/icon-symbol.tsx, components/layout/Header.tsx, components/session/ApprovalActions.tsx, specs/001-acp-mobile/tasks.md

🤖 Generated with Claude Code