[openstreetmap/openstreetmap-website] "Use current location" fills start field with "undefined, undefined" (Issue #7196)

[mwagnerrvsbr-droid]

mwagnerrvsbr-droid created an issue (openstreetmap/openstreetmap-website#7196)

### URL

https://www.openstreetmap.org/directions?engine=fossgis_osrm_car&route=;49.236424,6.992487

### How to reproduce the issue?

### Summary

The "Use current location" button in the directions page does not populate the start location correctly.

The current location is successfully obtained (blue location marker is displayed on the map), but the start field is filled with "undefined, undefined" instead of the current coordinates or address.

### Steps to reproduce

1. Open the directions page, for example:

https://www.openstreetmap.org/directions?engine=fossgis_osrm_car&route=;49.236424,6.992487

2. Grant location permission if requested.
3. Press the green "Use current location" button.

### Expected behavior

The current location should be inserted as the route origin and routing should work normally.

### Actual behavior

The start field becomes:

undefined, undefined

The blue location marker is displayed correctly on the map, so the browser successfully provides the current position.

### Tested on

- iPhone (Safari)
- Android (Chrome)

The issue occurs on both platforms.

### Additional information

Initially I suspected that the problem was caused by my own application, which links to the OSM directions page.

However, I was able to reproduce the issue directly on openstreetmap.org using the URL above, without involving my application.

The issue occurs regardless of whether:
- the `from` parameter is omitted,
- the destination is specified using the `route` parameter,
- the destination is specified using the `to` parameter.

This suggests that the problem is related to the "Use current location" functionality in the directions page rather than to the URL parameters.

### Screenshot(s) or anything else?

<img width="590" height="1278" alt="Image" src="https://github.com/user-attachments/assets/8b4ce910-5d71-4e6f-be4d-d932f0de3c86" />

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