Home button fits all of Slovakia; add an overview map, top-right

Home now fitBounds()s a country-wide bbox instead of resetting to
CENTER/ZOOM's Bratislava point, since Home resetting into the same
city you'd already be looking at wasn't useful.

The overview map is NPS's own overview plugin (npmap5-plugins, still
on an unmerged branch), vendored and converted from its UMD dist
build to a plain ES module. Patched one MapLibre API break found while
verifying it: the plugin reads map.transform (public in the MapLibre
~2.4 it targets) to relax the inset's polar pan limit; MapLibre 6 (this
app's vendored version) no longer exposes .transform at all, so it
threw on load. Guarded to skip that cosmetic adjustment when absent
instead.

docs/nps-resources.adoc

@@ -27,6 +27,10 @@ checking here before searching from zero next time.
 | Park Tiles color palette (offline basemap theme)
 | `public/js/map.js`'s `OFFLINE_THEME`
 | Colors only — see <<park-tiles>> for why the actual tile service isn't used
+
+| `overview` (top-right minimap/inset control)
+| `public/vendor/npmap-overview/`
+| MIT (per that branch's `package.json`); same public-domain repo as above
 |===
 
 See `docs/third-party-notices.adoc` for the formal vendored-library
@@ -99,18 +103,19 @@ https://github.com/nationalparkservice/npmap5-plugins/issues/7[#7].
 
 === On unmerged feature branches (less vetted — not on `main` yet)
 
+`overview` (branch `maplibre-gl-overview`) has since been adopted —
+see "What this app actually uses" above and
+`docs/architecture.adoc`'s control-stack section. Live demo (as
+upstream ships it, unpatched):
+https://raw.githack.com/nationalparkservice/npmap5-plugins/maplibre-gl-overview/examples/index.html.
+Note: MapLibre GL JS has no first-party minimap of its own — this
+isn't more "official" than any other third-party minimap plugin, just
+NPS-flavored.
+
 [cols="1,3"]
 |===
 | Plugin | What it is
 
-| `overview` (branch `maplibre-gl-overview`)
-| A minimap/inset control, any corner, respects pitch/bearing. Live
-  demo: https://raw.githack.com/nationalparkservice/npmap5-plugins/maplibre-gl-overview/examples/index.html.
-  Note: MapLibre GL JS has no first-party minimap of its own — this
-  wouldn't be more "official" than any other third-party minimap
-  plugin, just NPS-flavored. No minimap has been requested for this
-  app; would be a nice-to-have, not a fix for anything.
-
 | `carto` (branch `maplibre-gl-carto-source`)
 | Adds a vector-tile source backed by Carto.com-hosted data. Only
   useful if we actually have a Carto-hosted dataset to point at — we