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.

public/css/style.css

@@ -4,6 +4,18 @@ html, body {
   font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
 }
 
+/* Router-carved-signage display face (docs/nps-resources.adoc), used only
+   for the topbar wordmark below — a full body-text swap is a separate,
+   bigger decision this isn't. Bold is the only weight vendored since
+   .topbar__brand only ever renders at font-weight 700. */
+@font-face {
+  font-family: "National Park";
+  src: url("/vendor/national-park-typeface/NationalPark-Bold.woff2") format("woff2");
+  font-weight: 700;
+  font-style: normal;
+  font-display: swap;
+}
+
 #app {
   height: 100%;
   display: flex;
@@ -20,6 +32,7 @@ html, body {
 }
 
 .topbar__brand {
+  font-family: "National Park", -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
   font-size: 14px;
   font-weight: 700;
   letter-spacing: 0.12em;