chore(admin-ui): refresh browserslist and baseline browser mapping data

[NotThatKindOfDrLiz]

Summary

Refresh the admin UI frontend tooling data that currently emits non-blocking build warnings during npm run build:admin.

Context

PR #34 passes build and tests, but the admin UI build still warns that:

• baseline-browser-mapping data is over two months old
• Browserslist caniuse-lite data is 6 months old

This should be handled as a small follow-up tooling PR rather than mixed into the current feature/review-fix branch.

Scope

• Refresh Browserslist database data for admin-ui
• Update baseline-browser-mapping if needed
• Regenerate lockfile changes required for the refresh
• Run npm run build:admin
• Confirm the warnings no longer appear

Notes

• Keep this scoped to tooling/dependency-maintenance only
• Avoid mixing product or behavior changes into the same PR
• If dependency upgrades introduce unrelated churn, split that out or keep the delta minimal

Blocked by: finishing and merging PR #34