test: address latest review feedback

src/core/services/immersion-tracker-service.test.ts

@@ -2317,15 +2317,18 @@ test('handleMediaChange stores youtube metadata for new youtube sessions', async
   let tracker: ImmersionTrackerService | null = null;
   const originalFetch = globalThis.fetch;
   const originalPath = process.env.PATH;
+  let fakeBinDir: string | null = null;
 
   try {
-    const fakeBinDir = fs.mkdtempSync(path.join(os.tmpdir(), 'subminer-yt-dlp-bin-'));
+    fakeBinDir = fs.mkdtempSync(path.join(os.tmpdir(), 'subminer-yt-dlp-bin-'));
     const ytDlpOutput =
       '{"id":"abc123","title":"Video Name","webpage_url":"https://www.youtube.com/watch?v=abc123","thumbnail":"https://i.ytimg.com/vi/abc123/hqdefault.jpg","channel_id":"UCcreator123","channel":"Creator Name","channel_url":"https://www.youtube.com/channel/UCcreator123","uploader_id":"@creator","uploader_url":"https://www.youtube.com/@creator","description":"Video description","channel_follower_count":12345,"thumbnails":[{"url":"https://i.ytimg.com/vi/abc123/hqdefault.jpg"},{"url":"https://yt3.googleusercontent.com/channel-avatar=s88"}]}';
     if (process.platform === 'win32') {
+      const outputPath = path.join(fakeBinDir, 'output.json');
+      fs.writeFileSync(outputPath, ytDlpOutput, 'utf8');
       fs.writeFileSync(
         path.join(fakeBinDir, 'yt-dlp.cmd'),
-        `@echo off\r\necho ${ytDlpOutput.replace(/"/g, '\\"')}\r\n`,
+        '@echo off\r\ntype "%~dp0output.json"\r\n',
         'utf8',
       );
     } else {
@@ -2429,6 +2432,9 @@ printf '%s\n' '${ytDlpOutput}'
     globalThis.fetch = originalFetch;
     tracker?.destroy();
     cleanupDbPath(dbPath);
+    if (fakeBinDir) {
+      fs.rmSync(fakeBinDir, { recursive: true, force: true });
+    }
   }
 });
 

stats/src/lib/media-library-grouping.test.tsx

@@ -90,6 +90,16 @@ test('resolveMediaArtworkUrl prefers youtube thumbnails for video and channel im
   assert.equal(resolveMediaArtworkUrl(localVideo, 'channel'), null);
 });
 
+test('resolveMediaArtworkUrl normalizes blank thumbnail urls to null', () => {
+  const item = {
+    videoThumbnailUrl: '   ',
+    channelThumbnailUrl: '',
+  };
+
+  assert.equal(resolveMediaArtworkUrl(item, 'video'), null);
+  assert.equal(resolveMediaArtworkUrl(item, 'channel'), null);
+});
+
 test('summarizeMediaLibraryGroups stays aligned with rendered group buckets', () => {
   const groups = groupMediaLibraryItems([youtubeEpisodeA, localVideo, youtubeEpisodeB]);
   const summary = summarizeMediaLibraryGroups(groups);
@@ -100,6 +110,24 @@ test('summarizeMediaLibraryGroups stays aligned with rendered group buckets', ()
   });
 });
 
+test('groupMediaLibraryItems backfills missing group artwork from later items', () => {
+  const first = {
+    ...youtubeEpisodeA,
+    videoId: 10,
+    videoThumbnailUrl: null,
+    channelThumbnailUrl: null,
+  };
+  const second = {
+    ...youtubeEpisodeB,
+    videoId: 11,
+    channelThumbnailUrl: null,
+  };
+
+  const groups = groupMediaLibraryItems([first, second]);
+
+  assert.equal(groups[0]?.imageUrl, second.videoThumbnailUrl);
+});
+
 test('CoverImage renders explicit remote artwork when src is provided', () => {
   const markup = renderToStaticMarkup(
     <CoverImage

stats/src/lib/media-library-grouping.ts

@@ -17,10 +17,9 @@ export function resolveMediaArtworkUrl(
   item: Pick<MediaLibraryItem, 'videoThumbnailUrl' | 'channelThumbnailUrl'>,
   kind: 'video' | 'channel',
 ): string | null {
-  if (kind === 'channel') {
-    return item.channelThumbnailUrl ?? null;
-  }
-  return item.videoThumbnailUrl ?? null;
+  const raw = kind === 'channel' ? item.channelThumbnailUrl : item.videoThumbnailUrl;
+  const normalized = raw?.trim() ?? '';
+  return normalized.length > 0 ? normalized : null;
 }
 
 export function resolveMediaCoverApiUrl(videoId: number): string {
@@ -61,6 +60,10 @@ export function groupMediaLibraryItems(items: MediaLibraryItem[]): MediaLibraryG
       existing.totalActiveMs += item.totalActiveMs;
       existing.totalCards += item.totalCards;
       existing.lastWatchedMs = Math.max(existing.lastWatchedMs, item.lastWatchedMs);
+      if (!existing.imageUrl) {
+        existing.imageUrl =
+          resolveMediaArtworkUrl(item, 'channel') ?? resolveMediaArtworkUrl(item, 'video');
+      }
       continue;
     }