fix: text message not showing attachments upon sending

Closes #154
The sender of the message wouldn't see the children particle since we
only fetch the children once. And perhaps the firestore local cache
doesn't have the children particles or some other race condition. But
now, we fetch the live children.

This should anyways use the same number of reads as before since
attachments do not change.

js/src/hooks/use-particle-attachments.ts

@@ -1,6 +1,6 @@
 import { useMemo } from "react";
 import type { Particle } from "@/api/types";
-import { useParticleChildren } from "@/hooks/use-particle";
+import { useLiveParticleChildren } from "@/hooks/use-particle";
 import { particlePath, type ParticlePath, parseParticlePath } from "@/lib/particle-path";
 
 type FileParticle = Extract<Particle, { type: "file" }>;
@@ -18,7 +18,7 @@ export function useParticleAttachments(
     return particlePath(networkId, [...segments, particleId]);
   }, [streamPath, particleId]);
 
-  const { data: children, isLoading } = useParticleChildren(childrenPath);
+  const { children, isLoading } = useLiveParticleChildren(childrenPath);
 
   const attachments = useMemo(
     () => (children ?? []).filter((c): c is FileParticle => c.type === "file"),