Docs: Add CSF Next .type FAQ

[kylegach]

What I did

See title

Checklist for Contributors

Testing

Manual testing

N/A - docs-only change

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.

Summary by CodeRabbit

• Documentation
  • Added FAQ entry explaining how to use custom arg types with type-safe definitions.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: ae818e01-2fbb-478d-bd2a-0a9b5024d6a3

📥 Commits

Reviewing files that changed from the base of the PR and between 7c9e284 and 16baa25.

📒 Files selected for processing (1)

• docs/api/csf/csf-next.mdx

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📝 Walkthrough

Walkthrough

This PR adds a new FAQ entry to the CSF documentation explaining how preview.type can be used to specify custom argument types for stories, enabling type-safe custom arg definitions in Storybook.

Changes

Custom Arg Types Documentation

Layer / File(s)	Summary
Custom arg types FAQ entry docs/api/csf/csf-next.mdx	New FAQ subsection documents that preview.type enables specifying custom arg types for stories to provide type safety for customized args.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

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