feat: Wildlife Sightings layer from iNaturalist and Acartia

Recent community wildlife observations, as a new Wildlife group in the
layer panel.

- Server: keyless iNaturalist proxy (v2 observations with only the
  projected fields; undocumented v1 UTFGrid density tiles, decoded on the
  server) sharing one paced queue (burst 4, ~1/s, 60/min, 8,000/day budget,
  up to four in flight), in-memory caches and upstream-only cooldowns;
  Acartia Salish Sea marine-mammal feed rounded to 0.01 degrees with
  comments dropped.
- Layer: grid counts drawn as a soft view-ranked density glow; real sampled
  sightings as taxon badges at their true positions with ambient photo
  thumbnails and labels; obscured records stay privacy cells; a clicked
  sighting stays pinned through camera moves and refreshes.
- Anchored photo card per selection with the single iNaturalist link;
  attribution in the layer row and the Data attribution popover.
- Filters (CONFIRMED, taxa presets) round-trip in share links with token 9.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/data/layerState.test.mjs

@@ -203,8 +203,8 @@ function encode(state) {
 
 test('production registry is exact, canonical, and rejects incomplete contracts', async () => {
   assert.equal(validateLayerStateRegistry(), true);
-  assert.equal(REGISTERED_LAYER_IDS.length, 35);
-  assert.equal(new Set(REGISTERED_LAYER_IDS).size, 35);
+  assert.equal(REGISTERED_LAYER_IDS.length, 36);
+  assert.equal(new Set(REGISTERED_LAYER_IDS).size, 36);
   assert.ok(REGISTERED_LAYER_IDS.includes('transit'));
   assert.deepEqual(REGISTERED_LAYER_IDS, [...REGISTERED_LAYER_IDS].sort());
   assert.deepEqual(LEGACY_LAYER_STATE_TOKENS, {
@@ -243,7 +243,7 @@ test('production registry is exact, canonical, and rejects incomplete contracts'
   for (const [id, token] of Object.entries(LEGACY_LAYER_STATE_TOKENS)) {
     assert.equal(LAYER_STATE_TOKEN_RESERVATIONS[id], token);
   }
-  assert.equal(nextLayerStateToken(), '9');
+  assert.equal(nextLayerStateToken(), '00');
   assert.equal(
     nextLayerStateToken({
       ...LAYER_STATE_TOKEN_RESERVATIONS,
@@ -306,8 +306,8 @@ test('production registry is exact, canonical, and rejects incomplete contracts'
   assert.equal(
     validateLayerStateAllocations(LAYER_STATE_TOKEN_RESERVATIONS, {
       ...LAYER_STATE_TOKEN_RESERVATIONS,
-      future: '9',
-      next: '00',
+      future: '00',
+      next: '01',
     }),
     true,
   );
@@ -315,12 +315,13 @@ test('production registry is exact, canonical, and rejects incomplete contracts'
     () =>
       validateLayerStateAllocations(LAYER_STATE_TOKEN_RESERVATIONS, {
         ...LAYER_STATE_TOKEN_RESERVATIONS,
-        future: '00',
+        future: '01',
       }),
-    /next free token 9/,
+    /next free token 00/,
   );
   const beforeLastDigit = { ...digitsExhausted };
   delete beforeLastDigit['prior-9'];
+  delete beforeLastDigit['wildlife-sightings'];
   assert.equal(
     validateLayerStateAllocations(beforeLastDigit, {
       ...beforeLastDigit,
@@ -2695,6 +2696,32 @@ test('the recent-imagery split is share-link only: never stored locally, and a s
   );
 });
 
+test('wildlife confirmed and every taxa preset round-trip through the full share codec', () => {
+  assert.equal(
+    LAYER_STATE_REGISTRY.find(({ id }) => id === 'wildlife-sightings').token,
+    '9',
+  );
+  for (const taxa of [
+    'all',
+    'Aves',
+    'Mammalia',
+    'whales',
+    'Insecta',
+    'Plantae',
+  ]) {
+    const state = normalizeLayerState({
+      enabledLayerIds: ['wildlife-sightings'],
+      options: { 'wildlife-sightings': { confirmed: true, taxa } },
+    });
+    const encoded = encode(state);
+    assert.doesNotMatch(encoded, /undefined/);
+    assert.deepEqual(
+      decodeLayerStateParams(new URLSearchParams(encoded)),
+      state,
+    );
+  }
+});
+
 test('drone restrictions uses digit 8 without colliding with fire perimeters', () => {
   const decoded = decodeLayerStateParams(new URLSearchParams('v=2&l=8.2'));
   assert.deepEqual(decoded.enabledLayerIds, [