[openstreetmap/openstreetmap-website] More precise marker position (PR #6249)

[Roman Deev]

### Description

The marker is currently described as follows:
https://github.com/openstreetmap/openstreetmap-website/blob/9c8467e7ed9d38260077eaf64bb270b2acf18679/app/assets/javascripts/leaflet.map.js#L369-L373

Instead of 12 in `iconAnchor` it should be 12.5 because the marker is symmetrical. This is, of course, a small thing, but on Retina displays it can be noticed if, for example, the marker is set at the end point of the way.

The following screenshots can be reproduced using the following snippet for the browser console:

```javascript
L.marker(([42, 42]), ({ draggable: false, icon: OSM.getMarker({ color: "var(--marker-blue)" }) })).addTo(map);
L.circleMarker(L.latLng(42, 42), { weight: 2.5, radius: 3, fillOpacity: 0, color: "red" }).addTo(map);
```

<table>

<td>

Before
<td>

After

<tr>

<td>
<img width="50" height="60" src="https://github.com/user-attachments/assets/23afbded-0234-4586-9f76-483b1b538fba" />

<td>

<img width="50" height="60" src="https://github.com/user-attachments/assets/a19f08e3-b509-46c5-8682-223bdd715f2c" />

</table>

You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/6249

-- Commit Summary --

  * more precise marker position

-- File Changes --

    M app/assets/javascripts/embed.js.erb (2)
    M app/assets/javascripts/leaflet.map.js (2)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/6249.patch
https://github.com/openstreetmap/openstreetmap-website/pull/6249.diff

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