Fix Wikimedia photos still not loading on Android

__tests__/photoImageSource.test.ts

@@ -0,0 +1,20 @@
+/**
+ * @format
+ */
+
+import {photoImageSource} from '../src/photos/photoImageSource';
+
+// Must stay an array: Image.android.js only forwards `headers` to the
+// native view when `source` resolves to an array, so a plain
+// `{uri, headers}` object silently drops the header on Android.
+test('returns a single-element array so Android forwards the headers', () => {
+  const source = photoImageSource('https://example.com/photo.jpg');
+  expect(Array.isArray(source)).toBe(true);
+  expect(source).toHaveLength(1);
+});
+
+test('attaches a descriptive User-Agent header to the uri', () => {
+  const [source] = photoImageSource('https://example.com/photo.jpg');
+  expect(source.uri).toBe('https://example.com/photo.jpg');
+  expect(source.headers?.['User-Agent']).toMatch(/^Culpeos\//);
+});

src/photos/photoImageSource.ts

@@ -9,6 +9,12 @@ import type {ImageURISource} from 'react-native';
 const USER_AGENT = 'Culpeos/0.0.1 (https://culpeos.com)';
 
 // Builds an Image `source` for a photo URL with a User-Agent header attached.
-export function photoImageSource(uri: string): ImageURISource {
-  return {uri, headers: {'User-Agent': USER_AGENT}};
+//
+// Must be a single-element array, not a plain `{uri, headers}` object: on
+// Android, `Image`'s native-props translation (Libraries/Image/Image.android.js)
+// only forwards `headers` to the native view when `source` resolves to an
+// array — for a single object it drops them silently, so the request never
+// carries the header and the fix above has no effect.
+export function photoImageSource(uri: string): ImageURISource[] {
+  return [{uri, headers: {'User-Agent': USER_AGENT}}];
 }