Types: Update type signatures of objects and functions

[valentinpalkovic]

Closes #28500

What I did

Our bundler tsup sometimes doesn't seem to create type definition imports properly for inferred types. Instead of importing types from storybook/internal/* or @storybook/core/*, it would import types from core/dist/*. Explicitly defining types for the return type of functions or for objects will resolve this issue.

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/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-apps]

PR Summary

• code/frameworks/nextjs/src/portable-stories.ts: Updated type signatures to explicitly define return types.
• code/renderers/react/src/docs/extractArgTypes.ts: Explicitly defined return type of extractArgTypes as StrictArgTypes | null.
• code/renderers/react/src/entry-preview-docs.ts: Updated type signatures to explicitly define return types for functions and objects.
• code/renderers/svelte/src/docs/extractArgTypes.ts: Updated extractArgTypes return type to StrictArgTypes | null.
• code/renderers/vue3/src/docs/extractArgTypes.ts: Explicitly defined return type of extractArgTypes as StrictArgTypes | null.

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