Locality-Species: Add KML/SVG exports

[juhanikat]

Note: these exports already exist in Localities.

[karilint]

Starting implementation for this item.

Task scope: add KML and SVG export options to the Locality-Species view by reusing the existing Locality export behavior where possible, keeping the change focused on the relevant table/export UI path.

[karilint]

Implemented in draft PR #1155. The Locality-Species tab now exposes KML and SVG map exports through the existing table export menu. The implementation reuses the existing locality KML/SVG generators and converts occurrence rows to unique localities with valid coordinates before exporting.

[karilint]

Manual test checklist:

• Open a species detail page that has Locality-Species rows with coordinates.
• Go to the Locality-Species tab and open the table export menu.
• Confirm KML and SVG map export actions are visible.
• Apply a table filter, export KML, and confirm the downloaded file contains the filtered unique localities with coordinates.
• Export SVG map and confirm the downloaded SVG opens and renders the map markers.

[karilint]

Follow-up added to draft PR #1155: KML exports now include a per-locality species list, and the Locality detail Occurrences tab now has the same KML-with-species-list export plus SVG map export. Focused frontend tests cover species grouping/deduplication and KML species-list output.

[karilint]

Updated manual test checklist:

• Open a species detail page with multiple Locality-Species rows, including at least two species-locality rows for the same locality if available.
• In the species Locality-Species tab, open the export menu and export KML.
• Confirm the downloaded KML contains each exported locality once and includes a Species list in the locality description.
• In the species Locality-Species tab, export SVG map and confirm the SVG opens with locality markers.
• Open a locality detail page with Occurrences rows.
• In the locality Occurrences tab, open the export menu and confirm KML and SVG map export actions are visible.
• Export KML from the locality Occurrences tab and confirm the locality description includes the visible/filtered occurrence species list.
• Export SVG map from the locality Occurrences tab and confirm the SVG opens with the locality marker.

[karilint]

Second follow-up added to draft PR #1155: the main /occurrence table now also has KML-with-species-list and SVG map exports. The KML mapper groups occurrence rows by locality, skips rows without valid coordinates, and lists the grouped species in each locality placemark description.

[karilint]

Additional /occurrence manual test checklist:

• Open the main /occurrence page.
• Apply a filter that leaves rows from one or more localities.
• Open the export menu and confirm KML and SVG map export actions are visible alongside the occurrence export actions.
• Export KML and confirm each exported locality appears once with a Species list in the placemark description.
• Export SVG map and confirm the SVG opens with markers for the exported localities.