Build: Enable Nextjs-Vite sandboxes

[yannbf]

Closes #

What I did

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>

name	before	after	diff	z	%
createSize	0 B	0 B	0 B	-	-
generateSize	76.3 MB	76.3 MB	0 B	2.35	0%
initSize	167 MB	167 MB	0 B	2	0%
diffSize	91.1 MB	91.1 MB	0 B	0.41	0%
buildSize	7.42 MB	7.42 MB	0 B	0.73	0%
buildSbAddonsSize	1.61 MB	1.61 MB	0 B	-0.73	0%
buildSbCommonSize	195 kB	195 kB	0 B	-	0%
buildSbManagerSize	2.29 MB	2.29 MB	0 B	0.73	0%
buildSbPreviewSize	351 kB	351 kB	0 B	-0.73	0%
buildStaticSize	0 B	0 B	0 B	-	-
buildPrebuildSize	4.45 MB	4.45 MB	0 B	0.73	0%
buildPreviewSize	2.97 MB	2.97 MB	0 B	-0.73	0%
testBuildSize	0 B	0 B	0 B	-	-
testBuildSbAddonsSize	0 B	0 B	0 B	-	-
testBuildSbCommonSize	0 B	0 B	0 B	-	-
testBuildSbManagerSize	0 B	0 B	0 B	-	-
testBuildSbPreviewSize	0 B	0 B	0 B	-	-
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	6.6s	7.9s	1.2s	-1.15	16%
generateTime	19.5s	20.2s	711ms	-0.05	3.5%
initTime	16.8s	16.4s	-392ms	-0.43	-2.4%
buildTime	10.6s	11.4s	834ms	-0.35	7.3%
testBuildTime	0ms	0ms	0ms	-	-
devPreviewResponsive	9.2s	7.6s	-1s -543ms	-0.74	-20.1%
devManagerResponsive	4.8s	4.5s	-302ms	-1	-6.6%
devManagerHeaderVisible	864ms	816ms	-48ms	-0.15	-5.9%
devManagerIndexVisible	891ms	821ms	-70ms	-0.39	-8.5%
devStoryVisibleUncached	1.6s	1.2s	-322ms	-0.21	-24.9%
devStoryVisible	903ms	853ms	-50ms	-0.27	-5.9%
devAutodocsVisible	854ms	708ms	-146ms	-0.48	-20.6%
devMDXVisible	900ms	702ms	-198ms	-0.68	-28.2%
buildManagerHeaderVisible	811ms	803ms	-8ms	0.23	-1%
buildManagerIndexVisible	813ms	808ms	-5ms	0.24	-0.6%
buildStoryVisible	863ms	846ms	-17ms	0.19	-2%
buildAutodocsVisible	766ms	740ms	-26ms	0.32	-3.5%
buildMDXVisible	708ms	600ms	-108ms	-1.05	-18%

Greptile Summary

This pull request enables Next.js Vite sandboxes in Storybook by removing the 'inDevelopment' flag from the 'experimental-nextjs-vite/default-ts' template.

• Removed 'inDevelopment' flag from 'experimental-nextjs-vite/default-ts' template in code/lib/cli-storybook/src/sandbox-templates.ts
• Simplified import of generate function in scripts/tasks/generate.ts
• Indicates Next.js Vite integration for Storybook is now stable for CI and production use
• Improves code clarity by removing TypeScript workaround in generate.ts

[greptile-apps]

LGTM

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