Closes #31652

What I did

Angular 20 has rename the provideExperimentalZonelessChangeDetection to provideZonelessChangeDetection. So we reflects this change to fully support Angular 20.

NOTE: In Angular 20, zoneless is no longer experimental. We should also rename the experimentalZoneless option in STORYBOOK_ANGULAR_OPTIONS to zoneless, but it will introduce a BREAKING CHANGE. To keep compatibility with previous versions we skip this change.

Checklist for Contributors

Testing

The changes in this PR are covered in the following automated tests:

• stories
• unit tests
• integration tests
• end-to-end tests

Manual testing

This section is mandatory for all contributions. If you believe no manual test is necessary, please state so explicitly. Thanks!

Documentation

• Add or update documentation reflecting your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

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 canary-release-pr.yml --field pr=<PR_NUMBER>

Greptile Summary

Updates Angular support to handle the renamed zoneless change detection API in Angular 20, maintaining backwards compatibility with Angular 18-19.

• Modified code/frameworks/angular/src/client/angular-beta/AbstractRenderer.ts to support both provideZonelessChangeDetection (Angular 20+) and provideExperimentalZonelessChangeDetection (Angular 18-19)
• Maintains experimentalZoneless option name in STORYBOOK_ANGULAR_OPTIONS for backward compatibility
• Preserves functionality while adapting to Angular 20's non-experimental zoneless implementation
• Ensures smooth transition for projects using different Angular versions