fix(deps): update dependency mintlify to v4.2.284

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
mintlify	4.2.280 → 4.2.284

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Summary by cubic

Upgrade Mintlify in apps/docs from 4.2.280 to 4.2.284 to pick up upstream fixes and improve docs build/preview reliability. Lockfile pulls newer @mintlify CLI/preview/validation and @types/node; only package.json and pnpm-lock.yaml changed.

^{Written for commit b4f4abc. Summary will update on new commits.}

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