- Added a new modal for the Chart Builder to allow users to create visualizations from datasets.
- Integrated chart builder state management and validation for encoding configurations.
- Implemented auto-selection of default fields based on dataset column types.
- Added live preview functionality for real-time chart rendering.
- Created a new JavaScript file (chart-builder.js) to handle chart building logic.
- Updated app.js to initialize the chart builder and handle URL state changes.
- Enhanced styles in styles.css for the chart builder UI components.
- Documented the implementation details in project-docs/chart-builder-implementation.md.
