CHAPPiE Frontend Development

Stack

• Framework: React 18 + TypeScript
• Build: Vite
• Styling: Tailwind CSS (utility classes only, no CSS files)
• Routing: React Router (page-based)
• Data: TanStack React Query (useQuery, useMutation)
• API: Fetch-based SSE streaming client

Pages (frontend/src/pages/)

Page	File	Key Features
Chat	chat-page.tsx	Token streaming, message queue, thinking animation, CoT/Answer boxes
Settings	settings-page.tsx	All 40+ settings, emotion sliders, neural mapping, auto-save
Memories	memories-page.tsx	LTM search, STM buffer, session history, cleanup/wipe
Life	life-page.tsx	Homeostasis, needs, world model (refetchInterval: 3s)
Growth	growth-page.tsx	Planning, forecast, social arcs (refetchInterval: 3s)
Training	training-page.tsx	Daemon control, logs, config (refetchInterval: 5s)
Debug	debug-page.tsx	Metadata, debug entries (refetchInterval: 2s)

Key Patterns

Streaming Flow

1. User sends message → processMessage() → SSE stream via api.sendMessageStream()
2. Tokens arrive as event: token events with token_type: "answer"|"reasoning"
3. First answer token → transition from "thinking" to "streaming"
4. turn_finished → final message with metadata (formatted_cot, formatted_answer)

Auto-Scroll

• autoScrollRef tracks user position
• Scroll event listener updates it (threshold: 60px from bottom)
• New message → autoScrollRef.current = true
• Reasoning truncation: 3000 chars in stream, 4000 chars in final box

Two-Box UI (CoT + Answer)

• CoT: pine-border box above answer, shows formatted_cot from metadata
• Answer: main message bubble, shows formatted_answer (preferred) or raw content
• Uses whitespace-pre-line for formatted text with line breaks

Styling Conventions

• No separate CSS files — all Tailwind utilities inline
• rounded-none (square corners) everywhere
• Colors: ember (primary), pine (success), night (bg), ink (darkest), mist (text)
• shadow-glass for card-like elements
• text-[10px] uppercase tracking-widest for labels
• Missing module: ../lib/format → parseEmotionalText() in frontend/src/lib/format.ts