Portable stories: Support multiple annotation notations from preview

[yannbf]

Closes #29732

What I did

This PR makes it so that portable stories use the same mechanism as Storybook when loading annotations. This allows for supporting both notations at the same time coming from the preview file.

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>

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buildStaticSize	0 B	0 B	0 B	-	-
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testBuildSbManagerSize	0 B	0 B	0 B	-	-
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testBuildStaticSize	0 B	0 B	0 B	-	-
testBuildPrebuildSize	0 B	0 B	0 B	-	-
testBuildPreviewSize	0 B	0 B	0 B	-	-

name	before	after	diff	z	%
createTime	18.3s	7s	-11s -353ms	-1.21	-161.2%
generateTime	24s	19.4s	-4s -654ms	-0.39	-24%
initTime	15.1s	14.7s	-351ms	-0.1	-2.4%
buildTime	11.2s	8s	-3s -245ms	-0.94	-40.4%
testBuildTime	0ms	0ms	0ms	-	-
devPreviewResponsive	6.1s	5.8s	-288ms	-0.12	-4.9%
devManagerResponsive	3.6s	3.4s	-205ms	-0.35	-5.9%
devManagerHeaderVisible	634ms	620ms	-14ms	0	-2.3%
devManagerIndexVisible	657ms	654ms	-3ms	-0.13	-0.5%
devStoryVisibleUncached	1s	983ms	-17ms	-0.16	-1.7%
devStoryVisible	655ms	652ms	-3ms	-0.09	-0.5%
devAutodocsVisible	510ms	580ms	70ms	0.23	12.1%
devMDXVisible	591ms	553ms	-38ms	-0.1	-6.9%
buildManagerHeaderVisible	511ms	549ms	38ms	-0.31	6.9%
buildManagerIndexVisible	523ms	569ms	46ms	-0.3	8.1%
buildStoryVisible	513ms	548ms	35ms	-0.31	6.4%
buildAutodocsVisible	450ms	456ms	6ms	-0.31	1.3%
buildMDXVisible	446ms	412ms	-34ms	-0.57	-8.3%

Greptile Summary

Enhanced portable stories to support simultaneous handling of both named and default export annotations from preview files, matching Storybook's core behavior.

• Modified code/core/src/preview-api/modules/store/csf/portable-stories.ts to use composeConfigs for combining all module annotations
• Added test cases in portable-stories.test.ts to verify proper merging of named exports (e.g. initialGlobals) and default exports (e.g. parameters)
• Fixed issue [Bug]: Portable stories don't respect both annotations notations at the same time #29732 where annotations were being ignored when using both export types
• Maintains backward compatibility while supporting the dual annotation pattern

[greptile-apps]

LGTM

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