Name the Local area, say what each News section needs, and credit its sources

Local reads the area at the view centre (`/outline?at=`) and asks the feed
for its reports (`at`): the area is outlined faintly on the globe and named
at the top of the section ("News from Kazakhstan"; within 500 km at sea).
A disputed area is named as itself. A read that a newer look replaced, or
one left behind by a switch to Conflicts, is dropped, and a server without
the area route is asked once.

A section read from a key the server lacks says which key it needs
(503 `no_key`), that the key was refused (`key_rejected`) or that its
daily allowance is spent (`key_quota`); the other section keeps reading.
Liveuamap and World News API join the key registry.

Cards name the service a report came through ("via GDELT Project"), and
Liveuamap and Natural Earth are credited once their data shows. Economy is
a category of its own. Disputed-area labels are smaller and show the name
only; outlines keep up to 300 parts.

src/data/dataCredits.test.mjs

@@ -1,6 +1,10 @@
 import { test } from 'node:test';
 import assert from 'node:assert/strict';
-import { DATA_CREDITS, NYC_DOT_DISCLAIMER } from './dataCredits.js';
+import {
+  DATA_CREDITS,
+  LIVEUAMAP_CREDIT,
+  NYC_DOT_DISCLAIMER,
+} from './dataCredits.js';
 
 test('every credit carries a unique key and some markup to render', () => {
   const keys = DATA_CREDITS.map((entry) => entry.key);
@@ -153,3 +157,23 @@ test('every Street Level imagery source is in the attribution lightbox', () => {
       `${key} has no credit`,
     );
 });
+
+test('the News layer credits its built-in sources', () => {
+  const credit = (key) => DATA_CREDITS.find((entry) => entry.key === key);
+  // GDELT's terms ask for a citation and a link.
+  assert.match(
+    credit('gdelt-news').html,
+    /href="https:\/\/www\.gdeltproject\.org\/"[^>]*>GDELT Project</,
+  );
+  // World News API's free plan asks for this exact link.
+  assert.match(
+    credit('worldnewsapi').html,
+    /<a href="https:\/\/worldnewsapi\.com\/"[^>]*>World News API<\/a>/,
+  );
+  assert.match(LIVEUAMAP_CREDIT.html, />Liveuamap</);
+  assert.ok(
+    !DATA_CREDITS.some((entry) => entry.key === LIVEUAMAP_CREDIT.key),
+    'Liveuamap is credited only once its key is in use',
+  );
+  assert.doesNotMatch(credit('news').html, /No single provider/);
+});