feat(places): descriptions from the place's own website

Overture has no descriptions, and the encyclopaedias only describe the
places that have an article, which is a fraction of a percent. What
Overture does have is the address of the page the description is on, for
43 percent of places, and those pages publish a summary in JSON-LD or
og:description precisely so machines can read it.

The API fetches each page once and keeps the summary; every instance
reads it from there. TREK never opens a business's website itself, which
would mean one request per instance per place against small servers.

In the ladder it sits below the encyclopaedias and above Google: an
article about this exact place beats the operator's own copy, but for a
restaurant or a shop the operator's summary is the only one that exists.
Credited by host and linked back, with no licence claimed.

client/src/components/Planner/PlaceDetailsColumn.test.tsx

@@ -169,6 +169,28 @@ describe('PlaceDetailsColumn', () => {
     expect(link.parentElement).toHaveTextContent('CC BY-SA 4.0')
   })
 
+  it('FE-PDC-010b: credits a website description by host', async () => {
+    // The source labels used to be a ternary chain ending in 'Wikipedia', so a
+    // restaurant's own marketing copy would have been credited to an
+    // encyclopaedia. There is no fixed name for "the place's own website", and
+    // the host is the honest one.
+    placeEnrichment.mockResolvedValue({
+      photos: [],
+      facts: [],
+      description: {
+        text: 'Pizza in Rostock, seit 2015.',
+        source: 'website',
+        sourceUrl: 'https://www.losteria.net/rostock',
+        license: null,
+      },
+    })
+    renderColumn()
+
+    const link = await screen.findByRole('link', { name: /losteria\.net/ })
+    expect(link).toHaveAttribute('href', 'https://www.losteria.net/rostock')
+    expect(screen.queryByText(/Wikipedia/)).not.toBeInTheDocument()
+  })
+
   it('FE-PDC-011: says so when the admin switched enrichment off', async () => {
     placeEnrichment.mockResolvedValue({ photos: [], description: null, facts: [], disabled: true })
     renderColumn()

client/src/components/Planner/PlaceDetailsColumn.tsx

@@ -379,6 +379,37 @@ function PhotoTile({
   )
 }
 
+/**
+ * Who the description came from, as the reader would name them.
+ *
+ * `website` has no fixed name — it is the place's own site — so it is credited
+ * by host: "losteria.net" says where the text is from far better than a generic
+ * word would. Deliberately not a ternary chain: the previous one fell through
+ * to 'Wikipedia', which would have credited a restaurant's marketing copy to an
+ * encyclopaedia.
+ */
+function descriptionSourceLabel(
+  source: NonNullable<MapsPlaceEnrichmentResult['description']>['source'],
+  sourceUrl: string | null,
+): string {
+  switch (source) {
+    case 'google':
+      return 'Google'
+    case 'osm':
+      return 'OpenStreetMap'
+    case 'wikivoyage':
+      return 'Wikivoyage'
+    case 'wikipedia':
+      return 'Wikipedia'
+    case 'website':
+      try {
+        return new URL(sourceUrl || '').hostname.replace(/^www\./, '')
+      } catch {
+        return 'Website'
+      }
+  }
+}
+
 function sourceLabelFor(source: PlacePhotoCandidate['source']): string {
   if (source === 'google') return 'Google'
   if (source === 'wikipedia') return 'Wikipedia'
@@ -659,14 +690,7 @@ function DescriptionBlock({
 }): React.ReactElement | null {
   if (!description) return null
 
-  const sourceLabel =
-    description.source === 'google'
-      ? 'Google'
-      : description.source === 'osm'
-        ? 'OpenStreetMap'
-        : description.source === 'wikivoyage'
-          ? 'Wikivoyage'
-          : 'Wikipedia'
+  const sourceLabel = descriptionSourceLabel(description.source, description.sourceUrl)
 
   // A description of the chain is not a description of this place, and the
   // heading is where that gets said. Without it the reader has no way to tell