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Add a Home button and fill icon gaps from NPS's newer symbol library

Two things pulled in from github.com/nationalparkservice/npmap5-plugins:

- A "Home" button (public/vendor/npmap-home-button/, NPS's own MapLibre
  control) pinned to the app's CENTER/ZOOM, sitting top-left on the map. Now
  that the URL hash permalink can open the map at any view, "current view"
  and "the default view" aren't the same thing anymore, so a quick way back
  to the default is worth having.

- npmap5-plugins bundles a newer, actively-maintained version of the same
  NPS symbol-library already used for POI_ICONS (confirmed by its
  maintainer to be the designated replacement for the older standalone
  repo: nationalparkservice/npmap5-plugins#4), with a much larger icon
  vocabulary and a simpler CC0 (public domain) license. All 25 icons
  already in use came back byte-identical from the new source, so this
  just repoints their attribution — but it also has icons the old repo
  didn't: `forest` (POI_ICONS) is now the official "wilderness" pictogram
  instead of hand-drawn, and three of the five previously icon-less
  Services/Activities tags (wifi, mobile data coverage, winter/snow
  camping) now have real icons too. Only bakery and vehicle wash still
  have no NPS equivalent.

2026-09-07 19:45:19 +02:00

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Frontend libraries vendored under public/vendor/ instead of loaded from a CDN, so the app keeps working with no internet access. All are BSD-3-Clause licensed.

Library	Version	Source
MapLibre GL JS	6.6.0	https://github.com/maplibre/maplibre-gl-js
pmtiles (pmtiles.js)	4.5.0	https://github.com/protomaps/PMTiles
protomaps-themes-base	4.5.0	https://github.com/protomaps/basemaps

Also vendored under public/vendor/, but not BSD-3-Clause like the above — MIT-licensed per its own package.json (the monorepo’s top-level LICENSE.md separately places the whole repo in the public domain as a work of the US government; either way, no attribution is required):

Library	Version	Source
NPS Home Button (`home-button`)	0.0.1-d	https://github.com/nationalparkservice/npmap5-plugins/tree/main/home-button

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:

Asset	Source
Noto Sans Regular/Italic/Medium glyph PBFs (ranges `0-255`, `256-511` only)	protomaps/basemaps-assets (`fonts/`, `OFL.txt` included alongside)

The online map style (not vendored, fetched at runtime when the "Online" layer is selected) is OpenFreeMap "liberty", built from OpenStreetMap data.

To update a vendored library: download its package (e.g. npm pack <name>@<version>), replace the corresponding files under public/vendor/<name>/, and update the version in this file.

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