- Create interactive preview page showing timeline visualization
- Display demo family events (Smith family) with color-coded markers
- Responsive design with modern styling
- Shows birth (green), death (red), and marriage (blue) events
- Includes year markers and event details
- Implement build_tree() method required by NavigationView
- Calls goto_handle() with active family to rebuild display
- Fixes TypeError when loading MyTimeline view
- Add parentin references for fathers and mothers
- Add childof references for children
- Regenerate person XMLs with correct family relationships
- Fixes import errors about missing bidirectional references
- Add generate_demo_family.py script to generate demo data
- Add demo_family.gramps with large family tree:
* 2 parents (John and Mary Smith)
* 15 children
* 5 spouses
* ~20 grandchildren
* Multiple families with marriage events
* Birth and death events for all members
- Perfect for testing the MyTimeline plugin with real data
