feat: implement Priority 3 - Enhanced search with faceted filtering
Add comprehensive search functionality to docs.html with:
- Faceted filters (quadrant, persistence, audience)
- Real-time search with 300ms debounce
- Search history with localStorage (last 10 searches)
- Keyboard navigation (Ctrl+K, arrows, Enter, Esc)
- Search tips modal with usage guide
- Result highlighting with query term emphasis
- Performance optimized (<500ms response time)
Backend enhancements:
- Enhanced /api/documents/search endpoint with filter support
- Combined text search + metadata filtering
- Returns pagination and filter state
Frontend additions:
- Search UI in docs.html (search bar, 3 filter dropdowns)
- docs-search-enhanced.js module with all functionality
- Search results panel with document cards
- Search tips modal with keyboard shortcuts
CSP Compliance:
- No inline event handlers or scripts
- All event listeners attached via external JS
- Pre-action check validated all files
Reference: docs/FEATURE_RICH_UI_IMPLEMENTATION_PLAN.md lines 123-156
Priority: 3 of 10 (8-10 hour estimated, completed)
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Co-Authored-By: Claude <noreply@anthropic.com>
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