FIX: episode_chunk was hardcoded to 0, now reads from info.episodes or calculates dynamically

BUG: const episode_chunk = Math.floor(0 / 1000) was ALWAYS 0
FIX: Get chunk from info.episodes array OR calculate as episodeId / chunks_size

This fixes 404 errors for episodes 100+ which are in chunk-001

src/app/[org]/[dataset]/[episode]/fetch-data.ts

@@ -84,7 +84,9 @@ export async function getAdjacentEpisodesVideoInfo(
             videosInfo = extractVideoInfoV3WithSegmentation(repoId, version, info, episodeMetadata);
           } else {
             // For v2.x, use simpler video info extraction
-            const episode_chunk = Math.floor(0 / 1000);
+            // FIX: Get episode_chunk from info.episodes or calculate dynamically
+            const episodeInfoAdj = (info as any).episodes?.find((ep: any) => ep.episode_index === episodeId);
+            const episode_chunk = episodeInfoAdj?.episode_chunk ?? Math.floor(episodeId / (info.chunks_size || 1000));
             videosInfo = Object.entries(info.features)
               .filter(([, value]) => value.dtype === "video")
               .map(([key]) => {
@@ -121,7 +123,9 @@ async function getEpisodeDataV2(
   info: DatasetMetadata,
   episodeId: number,
 ) {
-  const episode_chunk = Math.floor(0 / 1000);
+  // FIX: Get episode_chunk from info.episodes array (like Python backend) or calculate dynamically
+  const episodeInfoFromMeta = (info as any).episodes?.find((ep: any) => ep.episode_index === episodeId);
+  const episode_chunk = episodeInfoFromMeta?.episode_chunk ?? Math.floor(episodeId / (info.chunks_size || 1000));
 
   // Dataset information
   const datasetInfo = {