chore(changeset): format scoped package names as code in changelogs

[rqbazan]

@changesets/changelog-github writes dependency lines with bare scoped package names (e.g. @variablelab/theme-toggle@2.0.1), and GitHub renders those in CHANGELOG.md, release notes and the version PR as mentions of real, unrelated accounts. This adds a local changelog module that delegates to it and wraps bare scoped names in backticks, leaving inline code, fenced code blocks and URLs untouched. Version PR headings come from changesets/action and aren't covered.

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https://claude.ai/code/session_01MrWogBto4w6eFAaVEkczQf

[changeset-bot]

⚠️ No Changeset found

Latest commit: e183887

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

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[rqbazan]

Closing: not pursuing this for now.