Security vulnerabilities and automated fixes for source maps issues
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A high-severity path traversal vulnerability (GHSA-r28c-9q8g-f849) in PostCSS versions prior to 8.5.18 allowed attackers to abuse the `sourceMappingURL` comment auto-loading mechanism to read arbitrary `.map` files outside the intended directory. The fix upgrades PostCSS from 8.5.15 to 8.5.18 in `frontend/package-lock.json` and pins the version via an `overrides` block in `frontend/package.json`. This closes a file disclosure primitive that, while not independently exploitable in all configurati