chore(deps-dev): bump postcss in /platform/apps/agent-sync-desktop/ui

Bumps [postcss](https://github.com/postcss/postcss) from 8.5.6 to 8.5.8.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.5.6...8.5.8)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.8
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

platform/apps/agent-sync-desktop/ui/package-lock.json

@@ -52,7 +52,7 @@
     "jsdom": "^28.1.0",
     "oxlint": "^1.50.0",
     "oxlint-tsgolint": "^0.15.0",
-    "postcss": "^8.4.49",
+    "postcss": "^8.5.8",
     "prettier": "^3.6.2",
     "tailwindcss": "^3.4.19",
     "typescript": "^5.7.2",