Library art: real gameplay instead of GitHub social cards; accept GIF sources

GitHub's opengraph preview is repo text, stats and an identicon; as a Steam hero
it looked broken. GitHub entries no longer default to it (the store draws its
fallback, Steam gets generated art). Source GIFs (common gameplay captures) are
accepted; the Frame's Chromium draws the first frame. Open Saber Plus uses its
gameplay GIF as banner. Verified on the Frame: hero/wide now show gameplay.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

tests/test_apk_more_sources.py

@@ -37,7 +37,7 @@ class PublisherSources(unittest.TestCase):
             self.assertTrue(entry['summary'])
             images = entry['images']
             self.assertEqual(entry['icon'], images['icon'])
-            for url in [images['icon'], images['banner']] + images['screenshots']:
+            for url in [u for u in [images['icon'], images['banner']] if u] + images['screenshots']:
                 self.assertTrue(url.startswith('https://'))
                 self.assertEqual(evidence[url]['status'], 200)
                 self.assertTrue(evidence[url]['image'])
@@ -53,8 +53,7 @@ class PublisherSources(unittest.TestCase):
         self.assertEqual(entry['images'], curated['images'])
         unknown = github.details(github.sources()[0], 'unknown/project')
         self.assertEqual(unknown['icon'], 'https://github.com/unknown.png')
-        self.assertEqual(unknown['images']['banner'],
-                         'https://opengraph.githubassets.com/1/unknown/project')
+        self.assertIsNone(unknown['images']['banner'])
 
     def test_real_releases(self):
         for key, repo in [('khronos', 'KhronosGroup/OpenXR-SDK-Source'),
@@ -79,8 +78,7 @@ class PublisherSources(unittest.TestCase):
         for entry, repo in zip(entries, data['items']):
             self.assertEqual(entry['icon'], repo['owner']['avatar_url'])
             self.assertEqual(entry['images']['icon'], entry['icon'])
-            self.assertEqual(entry['images']['banner'],
-                             'https://opengraph.githubassets.com/1/' + repo['full_name'])
+            self.assertIsNone(entry['images']['banner'])
             self.assertEqual(entry['images']['screenshots'], [])
         self.assertFalse(github.details(github.sources()[0], 'unknown/project')['downloadable'])
         with self.assertRaises(SourceError):

tests/test_frame_android_library.py

@@ -171,6 +171,10 @@ class ArtworkTests(unittest.TestCase):
         data = (FIXTURES / 'icon.jpg').read_bytes()
         self.assertEqual(art.image_type(data), 'jpg')
         self.assertEqual(art.image_type(data + b'\0' * 64), 'jpg')  # trailing padding after EOI
+        gif = b'GIF89a' + struct.pack('<HH', 640, 360) + b'\0' * 20  # gameplay GIFs: first frame drawn
+        self.assertEqual(art.image_type(gif), 'gif')
+        with self.assertRaises(ValueError):
+            art.image_type(b'GIF89a' + struct.pack('<HH', 0, 360) + b'\0' * 20)
         with self.assertRaises(ValueError):
             art.image_type(data[:30])