Phase 4.1: AI Writing Assistant
- GPT-4o integration with OpenAI API (fallback to local parsing)
- Six AI actions: summarize, expand, rewrite, extract actions,
suggest links, smart schedule
- TipTap inline AI assistant panel with streaming-ready architecture
- Apply/dismiss UI for AI suggestions
- Rewrite style selector (concise, formal, simpler, detailed)
Phase 4.2: Natural Language Input
- /api/v1/natural-language endpoint for parsing unstructured text
- AI-powered extraction of type, title, date, priority, participants
- Local regex fallback when no API key configured
- Priority parsing (!1-5) and date detection (tomorrow, next week)
Phase 4.3: Knowledge Graph
- D3.js-ready graph visualization container
- Zoom in/out/fit controls
- Placeholder state with guidance for content creation
- Data model for nodes, links, and groups
Phase 4.4: Semantic Search Infrastructure
- Unified search bar with debounced input (300ms)
- Type-based result icons (note, task, event)
- Search result display with title and content preview
- pgvector and embedding pipeline data model in schema
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