Parent: #142 ## Description The report form explains that users can click the map or enter coordinates. Typing coordinates works as a keyboard alternative, but users may not know the coordinates for a place. Add a place search that lets users find and select a location by name. Selecting a result should set the map marker and fill the location fields. ## Tasks - Add a labelled place-search field with selectable results. - Support keyboard navigation and selection of results. - Announce loading, result and error states to screen readers. - Set the marker and location fields when a result is selected. - Respect Nominatim’s usage policy, including request pacing and reuse of repeated lookups. ## Done when A keyboard user can find and set a sighting location by searching for a place, without clicking the map or entering coordinates.