Enhancement: POI with image thumbnails

[jpmens]

Augmenting on indicate Points of Interest (POI) on the map, our iOS app now supports submitting an image thumbnail on a POI, which is rendered on iOS as

The Recorder populates location payloads with image (the base64-encoded JPEG of the thumbnail 192x192 as with CARDs) and imagename (the actual photo filename) when serving them.

{
    "_type": "location",
    "image": "/9j/42nS1Xn ... JfVKcX0R5mIy9+813P/9k=",
    "imagename": "IMG_0009",
    "lat": 52.085284,
    "lon": 5.120975,
    "poi": "fabulous rijsttafel",
    "tid": "JJ",
    "tst": 1734377712
}

I think it would be a good idea to have these POI indicated in Frontend in a similar fashion.