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/architecture.adoc

@@ -137,26 +137,40 @@ Now that any view can be the starting one (via that permalink), a way
 back to the app's actual default is worth having: a "Home" button
 (`public/vendor/npmap-home-button/`, the National Park Service's own
 `home-button` MapLibre control — see `docs/third-party-notices.adoc`)
-sits top-left on the map, pinned to `CENTER`/`ZOOM` explicitly rather
-than its own fallback (the view at construction time, which would just
-be wherever a loaded permalink happened to point). It resets to the
-app's default view, not the visitor's own location — that's
-`GeolocateControl`, a separate button in the same stack (below).
+sits top-left on the map. It fits to `SLOVAKIA_BOUNDS` (a country-wide
+bounding box) rather than the plain `CENTER`/`ZOOM` point the map
+itself starts at — "home" is meant as a full-country overview, not a
+re-centering on Bratislava. It resets to that fixed default view, not
+the visitor's own location — that's `GeolocateControl`, a separate
+button in the same stack (below).
 
 That Home button is the top of a small top-left stack — Home, zoom
 in/out (`NavigationControl`, `showCompass: false` since this map never
 rotates), a passive zoom-level readout (`ZoomLevelControl`, a plain div
 updated on the map's `zoom` event — not a button, since it has no
-click behavior of its own), locate-me (`GeolocateControl`), and a
-"Base map" button — matching the National Park Service's own map
-control layout (grouped
-together on the map itself, rather than split across corners or
-between the map and a side panel). The last of those,
-`MapLayersButton` (`public/js/map.js`), is a second entry point into
-the exact same Online/Offline panel `LayerToggleControl` already
-manages in the page's own sidebar — both call the same
-`LayerToggleControl#toggle()`, so there's one source of truth for the
-panel's open/closed state either way.
+click behavior of its own), a distance/area measuring tool
+(`MeasureControl`, `public/js/measure.js`), locate-me
+(`GeolocateControl`), and a "Base map" button — matching the National
+Park Service's own map control layout (grouped together on the map
+itself, rather than split across corners or between the map and a side
+panel). The last of those, `MapLayersButton` (`public/js/map.js`), is
+a second entry point into the exact same Online/Offline panel
+`LayerToggleControl` already manages in the page's own sidebar — both
+call the same `LayerToggleControl#toggle()`, so there's one source of
+truth for the panel's open/closed state either way.
+
+A separate control sits top-right: a small inset overview map
+(`public/vendor/npmap-overview/`, NPS's `overview` plugin — see
+`docs/nps-resources.adoc`) showing the current view's location in a
+wider, zoomed-out context, with the visible area drawn as a box on top
+of it; dragging that box pans the main map. It clones whichever base
+style the main map is currently showing (`style: ''`, its own default —
+the plugin reads `map.style.serialize()`) rather than a separate style
+of its own, so it stays visually consistent with the Online/Offline
+toggle without this app maintaining a second style for it. Vendored
+from an unmerged upstream branch and patched for a MapLibre API break
+(it targeted MapLibre ~2.4's public `map.transform`, since removed) —
+see `docs/third-party-notices.adoc` for the exact patch.
 
 === Debug inspector (Alt+click)
 

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

docs/third-party-notices.adoc

@@ -36,8 +36,21 @@ required):
 | NPS Home Button (`home-button`)
 | 0.0.1-d
 | https://github.com/nationalparkservice/npmap5-plugins/tree/main/home-button
+
+| NPS Overview Map (`maplibre-gl-overview`)
+| 5.0.1
+| https://github.com/nationalparkservice/npmap5-plugins/tree/maplibre-gl-overview
 |===
 
+The overview map is vendored from an unmerged branch, not `main` (see
+`docs/nps-resources.adoc`), and converted from its UMD dist build to a
+plain ES module — no functional change except the module wrapper. It
+was also patched for a MapLibre API break: it reads `map.transform`
+(public in the MapLibre ~2.4 this plugin targets) to relax the
+overview's polar pan limit, but MapLibre 6's `Map` no longer exposes
+`.transform` at all — guarded to skip that (cosmetic) adjustment
+instead of throwing when it's absent.
+
 Offline map text labels need font glyphs too (see
 `docs/architecture.adoc`), vendored under `public/vendor/fonts/` —
 SIL Open Font License, not BSD-3-Clause like the above: