fix(#2385): fixing security findings in frontend

CVEs fixed:\n- CVE-2026-69153 (postcss)\n- GHSA-r28c-9q8g-f849 (postcss)\n- GHSA-c2j3-45gr-mqc4 (dompurify)\n\nCloses #2385

Author: paulushcgcj

frontend/package-lock.json

@@ -119,7 +119,7 @@
   },
   "overrides": {
     "@babel/core": "^8.0.0",
-    "dompurify": "^3.4.11",
+    "dompurify": "3.4.12",
     "uuid": "^14.0.0",
     "picomatch@^4.0.0": "^4.0.4",
     "flatted": "^3.4.2",
@@ -132,7 +132,7 @@
     "lodash@^4.0.0": "^4.18.1",
     "qs": "6.15.3",
     "follow-redirects": "^1.16.0",
-    "postcss": "^8.5.10",
+    "postcss": "8.5.23",
     "tmp": "^0.2.6",
     "js-yaml": "5.2.2",
     "fast-uri": "4.1.2",