Bump proj4 and @types/proj4 in /frontend (#665)

Bumps [proj4](https://github.com/proj4js/proj4js) and [@types/proj4](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/proj4). These dependencies needed to be updated together.

Updates `proj4` from 2.17.0 to 2.19.10
- [Release notes](https://github.com/proj4js/proj4js/releases)
- [Changelog](https://github.com/proj4js/proj4js/blob/master/changelog.md)
- [Commits](proj4js/proj4js@v2.17.0...v2.19.10)

Updates `@types/proj4` from 2.5.6 to 2.19.0
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/proj4)

---
updated-dependencies:
- dependency-name: proj4
  dependency-version: 2.19.10
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: "@types/proj4"
  dependency-version: 2.19.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

frontend/package-lock.json

@@ -30,7 +30,7 @@
     "echarts": "^5.6.0",
     "ngx-echarts": "19.0.0",
     "ol": "^10.6.1",
-    "proj4": "^2.15.0",
+    "proj4": "^2.19.10",
     "resize-observer-polyfill": "^1.5.1",
     "rxjs": "~7.8.1",
     "tslib": "^2.8.1",
@@ -41,7 +41,7 @@
     "@angular/compiler-cli": "^18.2.13",
     "@types/jasmine": "^5.1.7",
     "@types/node": "^24.0.13",
-    "@types/proj4": "^2.5.6",
+    "@types/proj4": "^2.19.0",
     "@types/ws": "^8.18.1",
     "angular-build-info": "^2.0.1",
     "jasmine-core": "~5.9.0",