operational fixes

package.json

@@ -17,6 +17,7 @@
     "express-session": "^1.18.0",
     "multer": "^1.4.5-lts.1",
     "occt-import-js": "^0.0.23",
+    "pngjs": "^6.0.0",
     "slugify": "^1.6.6",
     "three": "^0.184.0"
   },
@@ -28,6 +29,7 @@
     "@types/express-session": "^1.18.0",
     "@types/multer": "^1.4.11",
     "@types/node": "^22.0.0",
+    "@types/pngjs": "^6.0.5",
     "@types/three": "^0.184.0",
     "autoprefixer": "^10.4.19",
     "concurrently": "^8.2.2",