Nextjs-Vite: Fix docgen types in main config

[yannbf]

Closes #

What I did

This PR is a followup to #29824 to add types in StorybookConfig for typescript and docgen options

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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initTime	15.2s	12.4s	-2s -746ms	-0.9	-22%
buildTime	9.3s	9.9s	575ms	1.07	5.8%
testBuildTime	0ms	0ms	0ms	-	-
devPreviewResponsive	5.8s	4.9s	-886ms	-0.33	-18%
devManagerResponsive	4.3s	3.7s	-633ms	-0.23	-17%
devManagerHeaderVisible	717ms	533ms	-184ms	-0.5	-34.5%
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buildMDXVisible	435ms	581ms	146ms	1.49	🔺25.1%

Greptile Summary

Based on the provided information, I'll create a concise summary of the key changes in this pull request:

Adds TypeScript docgen configuration support to the experimental Next.js Vite framework by extending the StorybookConfig type system.

• Added TypescriptOptions type in experimental-nextjs-vite/src/types.ts with reactDocgen and reactDocgenTypescriptOptions fields
• Added import for docgenTypescript plugin type from @joshwooding/vite-plugin-react-docgen-typescript
• Extended StorybookConfig type to include optional typescript configuration for docgen settings
• Configured type definitions to support both react-docgen and react-docgen-typescript options

The changes enable proper TypeScript type checking when configuring documentation generation options in the Storybook main configuration file.

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[greptile-apps]

LGTM

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