fix: implement stream playback cleaner structure

js/src/lib/firestore-particles.ts

@@ -87,6 +87,7 @@ export function subscribeToParticleChildren(
   );
 }
 
+// This creates a new particle document with the given properties and returns its ID.
 export async function createParticle<T extends ParticleType>(
   collectionPath: string,
   type: T,