chore: resolve open dependabot security alerts

[jonathannorris]

Summary

Resolved 1 open Dependabot security alert by bumping the direct dependency to the patched version.

Dependabot Alerts Resolved

Alert	Package	Severity	Fix
#180	postcss	medium	Bumped direct dep from ^8.5.3 to ^8.5.10 (resolved to 8.5.12)

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[Copilot]

Pull request overview

Updates the project’s CSS processing dependency to address a Dependabot security alert for postcss, aligning the direct dependency with a patched release.

Changes:

• Bumped direct dependency postcss from ^8.5.3 to ^8.5.10 in package.json.
• Updated yarn.lock to include postcss@^8.5.10 resolving to 8.5.12.

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated 1 comment.

File	Description
package.json	Updates direct postcss semver range to a patched version.
yarn.lock	Adds lock entry for postcss@^8.5.10 (8.5.12) and adjusts selectors.

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[Copilot]

package.json now requests postcss@^8.5.10, but yarn.lock still contains older PostCSS installs (e.g. 8.4.49 and 8.5.6). If the Dependabot alert is fixed only in >=8.5.10 (per PR description), this change may not fully remove the vulnerable version(s) from the dependency tree. Consider forcing a single patched version via resolutions (e.g. pin PostCSS to 8.5.12) or running an upgrade that updates all PostCSS ranges and regenerating the lockfile.