Name the reporting provider in Contacts and Cockpit counts

The Cockpit Contact counts named fixed providers (OpenSky, adsb.lol,
AISStream) while the Layers panel and Contacts named the provider the last
snapshot reported, and the vessels layer kept that name out of getStats(),
so Contacts always said AISStream. Each cohort now carries the provider and
whether it answered as a fallback or from a stale snapshot, and both views
show it the way the Layers row does ("adsb.lol · FALLBACK").

Fixes HAL-721.

src/ui/cockpitContext.test.mjs

@@ -96,6 +96,13 @@ test('before the controller presents, the card shows the state it starts in', (t
     ),
     ['—', '—', '—', '—'],
   );
+  // No provider is named before a snapshot reports one.
+  assert.deepEqual(
+    [...document.querySelectorAll('[data-context-cohort] small')].map(
+      (source) => source.textContent,
+    ),
+    ['—', '—', '—', '—'],
+  );
   assert.equal(text('#cockpit-context-nearest-label'), 'NO AVAILABLE EXAMPLE');
   assert.equal(
     $('#cockpit-context-nearest-label').hasAttribute('aria-label'),
@@ -159,6 +166,45 @@ test('a snapshot fills the card and keeps classes other code sets', async (t) =>
   assert.equal(layouts.length, 1);
 });
 
+test('each count names the provider its snapshot reports, with its feed state', async (t) => {
+  // HAL-721: the counters named fixed providers while the layer and the
+  // Contacts list named the one that answered.
+  const reported = snapshot();
+  reported.cohorts[0].source = 'adsb.lol';
+  reported.cohorts[0].sourceStatus = 'fallback';
+  reported.cohorts[1].source = 'Plane Finder';
+  reported.cohorts.push(
+    {
+      id: 'ais-live-vessels',
+      label: 'AIS vessels',
+      source: 'Datalastic',
+      sourceStatus: 'stale',
+      count: 3,
+      relationship: 'OBSERVED',
+      nearest: [],
+    },
+    {
+      id: 'military-installations',
+      label: 'Mapped installations',
+      source: 'OpenStreetMap',
+      sourceStatus: null,
+      count: 0,
+      relationship: 'MAPPED',
+      nearest: [],
+    },
+  );
+  const { $, owner } = fixture(t, reported);
+  updateContext.call(owner, INFO, 0);
+  await nextTick();
+  const source = (id) => $(`[data-context-cohort="${id}"] small`);
+  assert.equal(source('flights').textContent, 'adsb.lol · FALLBACK');
+  assert.equal(source('military').textContent, 'Plane Finder');
+  assert.equal(source('ais-live-vessels').textContent, 'Datalastic · STALE');
+  assert.equal(source('military-installations').textContent, 'OpenStreetMap');
+  // The tile ellipsizes; the full name stays readable on hover.
+  assert.equal(source('flights').title, 'adsb.lol · FALLBACK');
+});
+
 test('a lost contact holds its readout behind the CONTACT LOST cue', async (t) => {
   const { $, text, owner, layouts } = fixture(t, snapshot());
   updateContext.call(owner, INFO, 0);