Prefer cached stills and stream first frames in the grid

poc/src/media.ts

@@ -391,16 +391,20 @@ export class MediaService {
         const file = this.getMediaFile(scrapeId, itemId);
         if (file) return { kind: "file", ...file };
 
+        const item = this.getMediaItem(scrapeId, itemId);
+        if (!item) return null;
+
+        return { kind: "remote", url: item.play_url ?? item.url };
+    }
+
+    /** Re-fetch the source message for a fresh signed URL. Null when not possible. */
+    async refreshMediaUrl(scrapeId: string, itemId: number): Promise<string | null> {
         const meta = this.engine.get(scrapeId);
         const item = this.getMediaItem(scrapeId, itemId);
         if (!meta || !item) return null;
+        if (meta.backend !== "slopbot" || !meta.guildId || !this.bot) return null;
 
-        if (meta.backend === "slopbot" && meta.guildId && this.bot) {
-            const refreshed = await this.refreshUrls(meta.id, meta.channelId, item);
-            if (refreshed) return { kind: "remote", url: refreshed };
-        }
-
-        return { kind: "remote", url: item.play_url ?? item.url };
+        return this.refreshUrls(meta.id, meta.channelId, item);
     }
 
     /** Re-fetch the source message and update expired URLs. Returns the fresh playable URL. */