Switch to 39004 for room presence

src/app/components/VoiceRoomItem.svelte

@@ -11,7 +11,9 @@
     joinVoiceRoom,
     leaveVoiceRoom,
     currentVoiceSession,
-    speakingPubkeys,
+    isParticipantSpeaking,
+    participantKey,
+    type VoiceParticipant,
   } from "@app/voice"
 
   interface Props {
@@ -46,8 +48,8 @@
   }
 
   $effect(() => {
-    for (const pk of $participants) {
-      loadProfile(pk)
+    for (const p of $participants) {
+      if (p.pubkey) loadProfile(p.pubkey)
     }
   })
 </script>
@@ -65,17 +67,17 @@
       <RoomName {url} {h} />
     </div>
     {#if $participants.length > 0}
-      {#each $participants as pk (pk)}
+      {#each $participants as p (participantKey(p as VoiceParticipant))}
         <div class="flex items-center gap-2 ml-6">
           <div
             class={cx(
               "inline-flex shrink-0 items-center justify-center rounded-full transition-shadow",
-              isActive && $speakingPubkeys.has(pk) && "ring-2 ring-success",
+              isActive && $isParticipantSpeaking(p) && "ring-2 ring-success",
             )}>
-            <ProfileCircle pubkey={pk} size={5} class="h-5 w-5" />
+            <ProfileCircle pubkey={p.pubkey} size={5} class="h-5 w-5" />
           </div>
           <span class="ellipsize text-xs opacity-70">
-            {displayProfileByPubkey(pk)}
+            {p.pubkey ? displayProfileByPubkey(p.pubkey) : "Unknown"}
           </span>
         </div>
       {/each}