Merge upstream/main: air-quality layer (AQHI) meets i18n

Upstream's #568 adds the Air quality layer to the Weather group (ECCC
AQHI, Canada only) with a band legend, worst-first list and voice
support.

- package-boundaries: both sides' entries unioned.
- layerPanel/weatherPanel tests: both sides' new tests kept; the
  weatherPanel fixture follows upstream (legendCategorical: true, the
  'list' block id) while our localized-history (K-6) test stays.
- air-quality strings marked: band labels and the provider label as
  msg() data, the readings-list aria-label through t(); es/ru entries
  added (+6 keys each).
- The synthetic air-quality allocation-benchmark titles follow the
  file's own convention (// i18n-ignore) like TRK/VESSEL/CAMERA.

Also verified the auto-merged weatherPanel.js against upstream: ORDER
gains 'air-quality', OBSERVED stays slice(2, 5), and the data-driven
legendCategorical path is upstream's.

npm run i18n: complete (2559), no unmarked strings. npm test: only the
pre-existing environmental OPENAI_API_KEY leak fails. Build passes.

src/voice/actionSchemas.test.mjs

@@ -37,7 +37,8 @@ test('the complete Realtime tool payload pins the manifest-generated layer relea
     // omit top-level anyOf (OpenAI rejects it). Contacts list routing preserves
     // requested radius and center authority in descriptions only.
     // Street Level and GNSS extend the manifest; tracked and analyst aircraft describe broadcasts.
-    '9398815a573ab29ecc3ce527f6e1a2ad883804e7696e0444aebb11f973700d4b',
+    // Air quality (ECCC AQHI) extends the manifest.
+    '775ba323384b4c1b62fb8415bac52aecc3fc668e20bedcfa57e426dcd1da3969',
   );
 });
 

src/voice/layerManifest.js

@@ -250,6 +250,24 @@ const layers = [
     context: false,
     noQuery: 'map overlay; no countable records',
   },
+  {
+    id: 'air-quality',
+    aliases: ['air quality', 'aqhi', 'smog', 'air pollution'],
+    context: false,
+    query: {
+      fields: {
+        value: ['n', 'AQHI'],
+        band: ['t'],
+        scale: ['t'],
+        provider: ['t'],
+        name: ['t'],
+        zone: ['t'],
+        risk: ['t'],
+        observedMs: ['ms'],
+      },
+      timeField: 'observedMs',
+    },
+  },
   {
     id: 'traffic',
     aliases: ['street traffic', 'road traffic', 'congestion'],