[openstreetmap/openstreetmap-website] Image download with user feedback (PR #6192)

[Marwin Hochfelsner]

@hlfan commented on this pull request.



> +          const contentType = blob.type;
+          let extension = "bin";
+          if (contentType === "image/png") extension = "png";
+          else if (contentType === "image/jpeg") extension = "jpg";
+          else if (contentType === "image/svg+xml") extension = "svg";
+          else if (contentType === "image/webp") extension = "webp";
+          else if (contentType === "application/pdf") extension = "pdf";
+          a.download = `map.${extension}`;

Without a value in the download attribute, the browser will decide filename and extension from the blob type for object URLs ([MDN](https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Elements/a#download)), but with `download="map"` set the extension should still be determined from the `blob.type`.

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