[openstreetmap/openstreetmap-website] Improve Open Graph previews (#2965)

[Alex Serebriakov]

Sleywill left a comment (openstreetmap/openstreetmap-website#2965)

For the map tile / area screenshot part of OG previews, [SnapAPI](https://snapapi.pics) might be useful — it can capture a full-page screenshot of any URL and return it as an image directly. Could work for generating the static OG image from the map view URL without maintaining your own headless browser infrastructure.

```ruby
# Example: generate OG image for /relation/12345
response = HTTP.post('https://api.snapapi.pics/v1/screenshot',
  json: { url: 'https://www.openstreetmap.org/relation/12345', 
          width: 1200, height: 630, format: 'jpeg' },
  headers: { 'X-API-Key' => ENV['SNAPAPI_KEY'] })
```

Free tier 200/month if you want to prototype without commitment.

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