Add support for widget + streamlit

[FlorentinD]

No description provided.

[Copilot]

Pull request overview

Adds a Streamlit integration layer to render neo4j_viz’s existing React-based GraphWidget inside Streamlit using Components v2, with two-way sync for selected and options.

Changes:

• Added neo4j_viz.streamlit.render_widget plus a Streamlit v2 frontend entrypoint to bridge state between Streamlit and the widget.
• Refactored GraphWidget’s Pydantic-backed traits to use a reusable PydanticTrait.
• Added Streamlit-focused tests, docs, packaging metadata, and an updated Streamlit example.

Reviewed changes

Copilot reviewed 12 out of 16 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
python-wrapper/tests/test_streamlit.py	New tests for Streamlit component rendering, serialization, and state round-trips.
python-wrapper/src/neo4j_viz/widget.py	Introduces PydanticTrait and uses it for options/selected/legend.
python-wrapper/src/neo4j_viz/streamlit.py	New Streamlit integration module (render_widget) and component declaration.
python-wrapper/pyproject.toml	Adds streamlit extra + packages Streamlit build artifacts.
python-wrapper/.gitignore	Updates ignore patterns for built frontend artifacts.
js-applet/vite.config.streamlit.ts	New Vite build config for Streamlit component bundle output.
js-applet/src/streamlit-entrypoint.ts	New Streamlit Components v2 entrypoint + anywidget-model shim.
js-applet/package.json	Adds build:streamlit and integrates it into the build pipeline.
examples/streamlit-example.py	Updates example to use neo4j_viz.streamlit.render_widget with two-way sync.
examples/getting-started.ipynb	Notebook output/execution metadata updates.
docs/antora/modules/ROOT/pages/rendering.adoc	Documents Streamlit static rendering and interactive widget sync usage.
changelog.md	Notes the new Streamlit integration feature.

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