Root cause of "planetiler exited with status 1: ... Unsupported format
tmp" (and likely the earlier unexplained "pmtiles exited with status
1"): Planetiler/go-pmtiles pick their output archive format from the
file extension, and the atomic-rename tmp files were named
"offline.pmtiles.tmp"/"terrain.pmtiles.tmp" — ".tmp" as the extension,
not ".pmtiles". Renamed to "offline.tmp.pmtiles"/"terrain.tmp.pmtiles".
Also, since build-status only ever said "running since X" with no way
to tell what it was actually doing:
- GET .../build-status now includes a `step` string ("fetching PL
(3/4) — done: SK, CZ — pending: HU", "tiling with planetiler", ...)
while a build is in progress.
- DELETE /api/offline-tiles / /api/terrain-tiles clear a built file,
its sidecar meta, and (for offline) the whole per-country download
cache — a manual "reclaim space" / "start over" action the region
picker's Apply never did on its own. DELETE
/api/offline-tiles/cache/:code clears just one country's cached
extract. All three are 409 while that kind's build is running, and
surfaced as a small "Delete" button on each row in the Offline data
panel.