Report a problem tool

> UI-wise, it would make sense to put a link "report a bug (+ export a Geojson)" in the top-right bar, accessible at any time
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> Hmm... maybe. In [another project](https://npw.scot), we chose to put a small button in the bottom-left of the map:
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> Users can opt into including their full project there:
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> I might split this out into a separate issue to do similar here.

_Originally posted by @dabreegster in [#387](https://github.com/a-b-street/ltn/issues/387#issuecomment-2976153464)_