Fix bulk delete error by making delById more defensive

- Extract map reference to local variable before iteration
- Change from forEach to for-of loop for better error handling
- Add null check on map before iterating
- Add @popperjs/core peer dependency for ng-bootstrap
- Update .gitignore to exclude package-lock.json

Co-authored-by: alexta69 <7450369+alexta69@users.noreply.github.com>

ui/package.json

@@ -38,6 +38,7 @@
     "@fortawesome/free-solid-svg-icons": "^7.1.0",
     "@ng-bootstrap/ng-bootstrap": "^20.0.0",
     "@ng-select/ng-select": "^21.1.0",
+    "@popperjs/core": "^2.11.8",
     "bootstrap": "^5.3.6",
     "ngx-cookie-service": "^21.1.0",
     "ngx-socket-io": "~4.9.3",
@@ -59,4 +60,4 @@
     "typescript-eslint": "8.47.0",
     "vitest": "^4.0.8"
   }
-}
+}