Add AltairWidget for flicker-free Altair charts#130
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Implements a smooth Altair chart widget that uses Vega's persistent View API to patch data in-place without re-parsing specs. This preserves interactive state (zoom, pan, selections) across data updates. - Python widget class accepts Altair charts or raw Vega-Lite specs - JavaScript uses CDN-loaded vega-embed for minimal bundle size - Spec structure comparison: full re-embed on structure change, data-only changeset updates otherwise - Includes marimo demo with interactive sliders controlling chart data - Comprehensive unit tests and API documentation Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
…-widget # Conflicts: # uv.lock
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
Adds AltairWidget, a smooth Altair chart widget that uses Vega's persistent View API to update chart data without re-rendering the DOM. When data changes, the widget updates in-place via changesets; when chart structure changes, it re-embeds. This preserves interactive state like zoom, pan, and selections across updates.
Implementation
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