Add NavList story IDs to .docs.json file

[mperrotti]

NavList component page doesn't have a link to the Storybook. No issue was created, but here's a Slack thread.

Changelog

New

Changed

Removed

Rollout strategy

• Patch release
• Minor release
• Major release; if selected, include a written rollout or migration plan
• None; if selected, include a brief description as to why

No release needed - this is just a docs update.

Testing & Reviewing

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Storybook)
• Changes are SSR compatible
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge
• (GitHub staff only) Integration tests pass at github/github (Learn more about how to run integration tests)

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Latest commit: b122be9

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Pull Request Overview

Adds Storybook story IDs to the NavList docs metadata so the component docs page can link to its stories.

• Populate previously empty stories array with explicit NavList story identifiers
• Improves documentation discoverability (no runtime or API changes)

[mperrotti]

Updating snapshots since we renamed "Simple" to "Default"