fix list and improve cloud functions

functions/src/thumbnail.js

@@ -35,7 +35,7 @@ exports.generateVideoThumbnail = onObjectFinalized(
     // Use unique folder under /tmp to avoid name collisions
     const tmpDir = path.join(
       os.tmpdir(),
-      `thumb-${Date.now()}-${Math.round(Math.random() * 1000)}`
+      `thumb-${Date.now()}-${Math.round(Math.random() * 1000)}`,
     );
     const baseName = path.basename(objectName);
     const dirName = path.posix.dirname(objectName);
@@ -96,7 +96,7 @@ exports.generateVideoThumbnail = onObjectFinalized(
             thumbnailUrl,
             updatedAt: admin.firestore.FieldValue.serverTimestamp(),
           },
-          { merge: true }
+          { merge: true },
         );
       }
 
@@ -115,5 +115,5 @@ exports.generateVideoThumbnail = onObjectFinalized(
     } finally {
       await fs.rm(tmpDir, { recursive: true, force: true });
     }
-  }
+  },
 );