fix(nests): broadcast presence/chat to the linked room's full relay list

Hand-raise toggles in Amethyst weren't appearing in nostrnests's UI.

nostrnests's NestsUI v2 routes reads against a fixed five-relay list
(NestsUI-v2/src/lib/const.ts: relay.snort.social, nos.lol, relay.damus.io,
relay.ditto.pub, relay.primal.net) — no outbox model. Its presence query
is just `kinds:[10312], "#a":[roomATag]` over those five relays.

Commit 637174ef already taught computeRelayListToBroadcast to fan a kind
30312 *room* event out to its `relays` tag. But kind 10312 presence (and
chat / reactions, etc.) is a different event type that *links* to the
room via an `a` tag. For those, broadcast was only reaching:

  - the broadcaster's outbox relays
  - the single firstOrNull() hint baked into the `a` tag
  - the relay we happened to receive the room event from

If none of those overlap with nostrnests's fixed five reads, the
hand-raise update is silently dropped.

Extend the `linkedAddressIds` block in computeRelayListToBroadcast: when
the linked address resolves to a MeetingSpaceEvent / MeetingRoomEvent /
LiveActivitiesEvent, also add that linked event's allRelayUrls(). This
covers presence updates and any other room-scoped event that points at
a Nest via `#a`.

https://claude.ai/code/session_016G7oP5BotPjUBgvMYrrrxh

amethyst/src/main/java/com/vitorpamplona/amethyst/model/Account.kt

@@ -195,6 +195,7 @@ import com.vitorpamplona.quartz.nip47WalletConnect.rpc.Request
 import com.vitorpamplona.quartz.nip47WalletConnect.rpc.Response
 import com.vitorpamplona.quartz.nip51Lists.bookmarkList.BookmarkListEvent
 import com.vitorpamplona.quartz.nip51Lists.bookmarkList.tags.AddressBookmark
+import com.vitorpamplona.quartz.nip53LiveActivities.meetingSpaces.MeetingRoomEvent
 import com.vitorpamplona.quartz.nip53LiveActivities.meetingSpaces.MeetingSpaceEvent
 import com.vitorpamplona.quartz.nip53LiveActivities.streaming.LiveActivitiesEvent
 import com.vitorpamplona.quartz.nip56Reports.ReportType
@@ -1002,6 +1003,20 @@ class Account(
 
                     linkedNote.event?.let { linkedEvent ->
                         relayList.addAll(computeRelaysForChannels(linkedEvent))
+
+                        // Audio rooms / live activities pin their relay set
+                        // on the room event itself. Presence (kind 10312) and
+                        // any other event whose `a` tag points at one of these
+                        // must also fan out to that relay list — otherwise a
+                        // hand-raise / mute / publishing update only reaches
+                        // the broadcaster's outbox + the single firstOrNull()
+                        // hint baked into the `a` tag, and a fixed-relay
+                        // listener like nostrnests never sees it.
+                        when (linkedEvent) {
+                            is MeetingSpaceEvent -> relayList.addAll(linkedEvent.allRelayUrls())
+                            is MeetingRoomEvent -> relayList.addAll(linkedEvent.allRelayUrls())
+                            is LiveActivitiesEvent -> relayList.addAll(linkedEvent.allRelayUrls())
+                        }
                     }
                 }
             }