Addon-Docs: Add support for sourceState: 'none' to canvas block parameters

[quisido]

Closes #33626

This looks like it should be cherry-picked to main as well.

What I did

Added 'none' as an acceptable value for the canvas block parameters.

Checklist for Contributors

Manual testing

I added it to my local installation, and it works.

Checklist for Maintainers

• When this PR is ready for testing, make sure to add ci:normal, ci:merged or ci:daily GH label to it to run a specific set of sandboxes. The particular set of sandboxes can be found in code/lib/cli-storybook/src/sandbox-templates.ts

• Make sure this PR contains one of the labels below:

  Available labels

  • bug: Internal changes that fixes incorrect behavior.
  • maintenance: User-facing maintenance tasks.
  • dependencies: Upgrading (sometimes downgrading) dependencies.
  • build: Internal-facing build tooling & test updates. Will not show up in release changelog.
  • cleanup: Minor cleanup style change. Will not show up in release changelog.
  • documentation: Documentation only changes. Will not show up in release changelog.
  • feature request: Introducing a new feature.
  • BREAKING CHANGE: Changes that break compatibility in some way with current major version.
  • other: Changes that don't fit in the above categories.

🦋 Canary release

This PR does not have a canary release associated. You can request a canary release of this pull request by mentioning the @storybookjs/core team here.

core team members can create a canary release here or locally with gh workflow run --repo storybookjs/storybook publish.yml --field pr=<PR_NUMBER>

Summary by CodeRabbit

Release Notes

• New Features
  • Extended canvas block configuration options by adding a 'none' state for source visibility, complementing the existing 'hidden' and 'shown' states.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

📝 Walkthrough

Walkthrough

Updated the CanvasBlockParameters type definition to extend the sourceState option from 'hidden' | 'shown' to include 'none' as an additional union member.

Changes

Cohort / File(s)	Summary
Type Definition Update code/addons/docs/src/types.ts	Added 'none' to the sourceState union type in CanvasBlockParameters

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

✨ Finishing touches

• 📝 Generate docstrings

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[storybook-app-bot]

Package Benchmarks

^{Commit: 611cce9, ran on 26 January 2026 at 14:25:23 UTC}

The following packages have significant changes to their size or dependencies:

@storybook/addon-a11y

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