Use the National Park typeface for the topbar wordmark

Self-hosted Bold woff2 only (the one weight .topbar__brand renders at)
under public/vendor/national-park-typeface/ — a router-carved-signage
display face for the "MAPTOOL" heading, matching the uppercase/
letter-spaced treatment it already had. Everything else stays on the
system font stack; this is a wordmark swap, not a body-text one.

docs/nps-resources.adoc/third-party-notices.adoc updated to record it.

docs/nps-resources.adoc

@@ -259,6 +259,20 @@ own work (a map viewer, not a publisher of NPS-branded content):
   own UI chrome (currently plain system fonts, `public/css/style.css`) —
   no current use case, but no licensing blocker either, worth
   remembering if that comes up.
+* *Another open alternative, for display use*: https://nationalparktypeface.com[National Park]
+  — a separate, unrelated project (Ben Hoepner, Andrea Herstowski, Jeremy
+  Shellhorn / DO Studio), also SIL OFL licensed, also original ("inspired
+  by" park signage, not a Rawlinson reproduction). Ships as variable
+  `.ttf`, `.woff`/`.woff2`, and `.otf` — self-hostable via `@font-face`
+  the same way. Where it differs from Sequoia Sans above: it's a
+  router-carved-signage *display* face (the chunky all-caps look of
+  actual trailhead signs), not a general body/UI sans — best fit would be
+  a wordmark/heading use (e.g. the topbar's "MAPTOOL" text) alongside a
+  more legible sans for body copy, not a full typeface swap. Now used for
+  exactly that: `.topbar__brand` only (`public/css/style.css`), Bold
+  weight vendored under `public/vendor/national-park-typeface/` — see
+  `docs/third-party-notices.adoc`. Body copy elsewhere still plain system
+  fonts, unchanged.
 * *Hawaiian typography*: NPS Rawlinson includes vowels with Hawaiian
   macrons (ā, ē, ī, ō, ū) and the okina (ʻ); the regular weight of
   Frutiger doesn't, so NPS uses a separate "HFrutiger" weight for