fix: show the whole weather map when a window cannot cover the area

The map window was moved inside the product's bounds without checking that
it still covered the requested area, so an area across the antimeridian got
an image of only one side. A window must now hold the whole area, clipped to
the product, or the tool returns the product's full extent.

src/tools/queries/atmosphere.test.mjs

@@ -2,6 +2,7 @@ import assert from 'node:assert/strict';
 import test from 'node:test';
 import { composeCatalog, coreTools } from '../index.js';
 import { weatherWindow } from './atmosphere.js';
+import { resolveArea } from '../area.js';
 
 const CONUS = { west: -130, south: 20, east: -60, north: 55 };
 const PNG = Uint8Array.from([0x89, 0x50, 0x4e, 0x47]);
@@ -156,3 +157,18 @@ test('wind is sampled from the model grid at the location', async () => {
     (error) => error.code === 'unavailable',
   );
 });
+
+test('a weather window that cannot cover the area falls back to the whole map', async () => {
+  const world = { west: -180, south: -90, east: 180, north: 90 };
+  // 100 km around 179.8° crosses the antimeridian.
+  const dateline = await resolveArea({ lat: 0, lon: 179.8, radius_km: 100 });
+  assert.equal(weatherWindow(dateline, world), null);
+  // Near a product edge the window moves inside and still covers the area.
+  const conus = { west: -130, south: 20, east: -60, north: 55 };
+  const edge = await resolveArea({ lat: 40, lon: -129.5, radius_km: 50 });
+  const box = weatherWindow(edge, conus);
+  assert.ok(box);
+  assert.ok(box.west <= Math.max(edge.west, conus.west));
+  assert.ok(box.east >= edge.east);
+  assert.ok(box.south <= edge.south && box.north >= edge.north);
+});