Altair embed options to remove actions

[koaning]

Altair has an annoying default

The normal fix in altair is to declare this:

alt.renderers.set_embed_options(actions=False)

However, this effect is ignored when we do mo.ui.altair_chart over any altair chart. This PR fixes that.

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Note

Propagates Altair renderer embed_options (e.g., actions=False) to the frontend Vega component and uses them to control VegaLite embed actions.

• Frontend (Vega plugin/component):
  • Add embedOptions to plugin validator and Data interface; plumb through VegaPlugin -> VegaComponent -> LoadedVegaComponent.
  • Compute actions from embedOptions.actions when provided; default to { source: false, compiled: false } otherwise. Remove hardcoded actions constant.
• Backend (Altair UI element):
  • Read global alt.renderers.options["embed_options"] if set and include as "embed-options" in component args.
  • Result: global Altair embed options now affect the rendered Vega chart (e.g., hiding action buttons).

^{Written by Cursor Bugbot for commit befb438. This will update automatically on new commits. Configure here.}

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Project	Deployment	Preview	Comments	Updated (UTC)
marimo-docs	Ready	Preview	Comment	Nov 24, 2025 6:17pm

[mscolnick]

should this spread be here? i think we can just return:

{
      source: false,
      compiled: false,
}

[mscolnick]

@copilot can you fix the typecheck issues and commit directly

[Copilot]

@mscolnick I've opened a new pull request, #7285, to work on those changes. Once the pull request is ready, I'll request review from you.

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I have read the CLA Document and I hereby sign the CLA

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1 out of 2 committers have signed the CLA.
✅ (koaning)[https://github.com/koaning]
❌ @Copilot
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