Three UX issues from manual testing of #780 on NOMAD3.
1. Slider was unusable for multi-step zoom changes
`setLoading(true)` fired immediately on every selection or maxzoom change,
which disabled the slider until the request returned. Even with the 400ms
debounce delaying the network call, the UI was locked the whole time.
User couldn't drag through zoom levels to find the right one.
Fix: bump debounce to 1500ms, move `setLoading(true)` inside the setTimeout
so it only flips after the debounce expires. Slider stays interactive
throughout the wait. Slider `disabled` now only ties to `downloading`
(active extract dispatch), not `loading` (preflight in flight). The
existing requestId stale-safe pattern handles concurrent changes.
2. Newly-downloaded maps didn't show in Stored Map Files until manual refresh
`props.maps.regionFiles` is rendered server-side and passed through Inertia
props; without a partial reload it stayed stale until the user navigated
away and back.
Fix: watch `useDownloads({ filetype: 'map' })` count via a ref. When the
count drops (a download finished), trigger `router.reload({ only: ['maps'] })`
to refresh just the maps prop. Existing pattern from elsewhere in the
codebase.
3. Country picker didn't surface already-downloaded countries
When a user re-opened "Choose Countries" after downloading UK, UK appeared
unchecked with no indication it was already on disk.
Fix: pass installed pmtiles filenames into the modal as a prop; parse with
regex `^([a-z]{2})_[\w-]+_z\d+\.pmtiles$` to extract country codes from
single-country extracts (matching MapService.buildRegionSlug's iso2 lowercase
slug pattern). Render an "Installed" badge on those countries with a tooltip
explaining they're re-selectable for redownload at a different zoom.
Group / custom multi-country extracts don't reverse-map cleanly from
filename and are skipped here. Could be a follow-up if useful.
Files:
admin/inertia/components/CountryPickerModal.tsx
- SINGLE_COUNTRY_FILENAME_RE: iso2 + flexible date + zoom
- installedFilenames prop with default []
- installedCountrySet derivation via useMemo
- "Installed" badge rendering on country list rows
- Debounce: 400ms -> 1500ms; setLoading inside setTimeout
- Slider disabled: only on `downloading`
admin/inertia/pages/settings/maps.tsx
- import useEffect/useRef
- destructure activeMapDownloads from useDownloads
- useEffect on download count drop -> router.reload({ only: ['maps'] })
- pass installedFilenames to CountryPickerModal
All three fixes tested end-to-end on NOMAD3.
1df6777098