fix(nests): keep presence out of channel chat + render kind:10312

Two-part fix for kind-10312 [MeetingRoomPresenceEvent] showing up as
empty cards in the channel chat panel.

(1) Filter at the chat-feed level. ChannelFeedFilter now rejects
MeetingRoomPresenceEvent — these only land in `channel.notes` so the
home live-bubble (HomeLiveFilter) can detect a follow broadcasting
in a Nest by walking channel.notes. They aren't chat content; the
chat panel rendering them as empty rows was a leak from that
home-bubble plumbing.

The filter is in ChannelFeedFilter rather than upstream in
LocalCache.consume because removing presence from channel.notes
would silently break the home-bubble's broadcasting-now detection.
This way the channel keeps the events for non-chat consumers and
the chat just refuses to surface them.

(2) Renderer fallback. NoteCompose now dispatches kind-10312 to
RenderMeetingRoomPresence — a one-line italic status row ("@user ·
raised their hand" / "stepped on stage" / "is speaking" / "joined
as audience" / "left the nest"). After (1) this only shows up on
non-chat surfaces (search results, thread view of a quoted
presence, profile timeline, …), but renders informatively instead
of as the empty card it was before.

Five new strings under nest_presence_*.

https://claude.ai/code/session_01RDpuki4t8StSg1CZcXnV5b

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/note/NoteCompose.kt

@@ -1039,6 +1039,11 @@ private fun RenderNoteRow(
             RenderMeetingRoomEvent(baseNote, accountViewModel, nav)
         }
 
+        is com.vitorpamplona.quartz.nip53LiveActivities.presence.MeetingRoomPresenceEvent -> {
+            com.vitorpamplona.amethyst.ui.note.types
+                .RenderMeetingRoomPresence(baseNote, accountViewModel, nav)
+        }
+
         is GitRepositoryEvent -> {
             RenderGitRepositoryEvent(baseNote, accountViewModel, nav)
         }

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/note/types/MeetingSpace.kt

@@ -293,6 +293,72 @@ fun RenderMeetingRoomEventInner(
     RenderParticipants(participants, accountViewModel, nav)
 }
 
+/**
+ * Inline renderer for kind-10312 [MeetingRoomPresenceEvent] events.
+ * The event's `content` is empty; the interesting bits are the
+ * presence flags. Render a one-line italic status — "@user · raised
+ * their hand" — so a presence event that leaks into a feed surface
+ * outside the room (search results, thread view of a quoted
+ * presence, …) renders as a status note instead of an empty card.
+ *
+ * The active room's chat panel does NOT render presence events at
+ * all — `ChannelFeedFilter` filters them out so the chat stays
+ * just chat. This composable is the fallback for everything else.
+ */
+@Composable
+fun RenderMeetingRoomPresence(
+    baseNote: Note,
+    accountViewModel: AccountViewModel,
+    nav: INav,
+) {
+    val event = baseNote.event as? com.vitorpamplona.quartz.nip53LiveActivities.presence.MeetingRoomPresenceEvent ?: return
+
+    val handRaised = remember(event) { event.handRaised() == true }
+    val publishing = remember(event) { event.publishing() == true }
+    val onstage = remember(event) { event.onstage() == true }
+
+    val stateRes =
+        when {
+            !publishing && !onstage && !handRaised -> R.string.nest_presence_left
+            handRaised -> R.string.nest_presence_raised_hand
+            onstage && publishing -> R.string.nest_presence_speaking
+            onstage -> R.string.nest_presence_on_stage
+            else -> R.string.nest_presence_listening
+        }
+
+    val user =
+        remember(event.pubKey) {
+            com.vitorpamplona.amethyst.model.LocalCache
+                .getOrCreateUser(event.pubKey)
+        }
+
+    Row(
+        modifier =
+            Modifier
+                .fillMaxWidth()
+                .padding(vertical = 4.dp)
+                .clickable { nav.nav(routeFor(user)) },
+        verticalAlignment = Alignment.CenterVertically,
+    ) {
+        ClickableUserPicture(user, 20.dp, accountViewModel)
+        Spacer(modifier = Modifier.padding(horizontal = 4.dp))
+        UsernameDisplay(
+            baseUser = user,
+            fontWeight = androidx.compose.ui.text.font.FontWeight.Normal,
+            accountViewModel = accountViewModel,
+        )
+        Spacer(modifier = Modifier.padding(horizontal = 4.dp))
+        Text(
+            text = stringRes(stateRes),
+            style =
+                MaterialTheme.typography.bodySmall.copy(
+                    fontStyle = androidx.compose.ui.text.font.FontStyle.Italic,
+                ),
+            color = MaterialTheme.colorScheme.placeholderText,
+        )
+    }
+}
+
 @Composable
 private fun RenderParticipants(
     participants: List<ParticipantTag>,

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/chats/publicChannels/dal/ChannelFeedFilter.kt

@@ -26,6 +26,7 @@ import com.vitorpamplona.amethyst.model.Note
 import com.vitorpamplona.amethyst.ui.dal.AdditiveFeedFilter
 import com.vitorpamplona.amethyst.ui.dal.ChangesFlowFilter
 import com.vitorpamplona.amethyst.ui.dal.DefaultFeedOrder
+import com.vitorpamplona.quartz.nip53LiveActivities.presence.MeetingRoomPresenceEvent
 
 class ChannelFeedFilter(
     val channel: Channel,
@@ -37,12 +38,25 @@ class ChannelFeedFilter(
     override fun changesFlow() = channel.changesFlow()
 
     // returns the last Note of each user.
-    override fun feed(): List<Note> = sort(channel.notes.filterIntoSet { key, it -> account.isAcceptable(it) })
+    override fun feed(): List<Note> = sort(channel.notes.filterIntoSet { key, it -> isChatEvent(it) && account.isAcceptable(it) })
 
     override fun applyFilter(newItems: Set<Note>): Set<Note> =
         newItems
-            .filter { channel.notes.containsKey(it.idHex) && account.isAcceptable(it) }
+            .filter { channel.notes.containsKey(it.idHex) && isChatEvent(it) && account.isAcceptable(it) }
             .toSet()
 
     override fun sort(items: Set<Note>): List<Note> = items.sortedWith(DefaultFeedOrder)
+
+    /**
+     * Reject non-chat events that get attached to a [Channel] for other
+     * surfaces. The current case: kind-10312
+     * [MeetingRoomPresenceEvent]s land in `channel.notes` so the home
+     * live-bubble can detect a follow broadcasting in a Nest
+     * (HomeLiveFilter scans channel.notes); they have no chat content
+     * and would otherwise render as an empty card in the chat panel.
+     *
+     * Anything else is passed through — chat messages, zaps, raids,
+     * clips, channel-create / metadata events all belong here.
+     */
+    private fun isChatEvent(note: Note): Boolean = note.event !is MeetingRoomPresenceEvent
 }

amethyst/src/main/res/values/strings.xml

@@ -530,6 +530,11 @@
     <string name="nest_notification_stop">Stop</string>
     <string name="nest_join">Join nest</string>
     <string name="nest_lobby_host_label">Host</string>
+    <string name="nest_presence_raised_hand">raised their hand</string>
+    <string name="nest_presence_on_stage">stepped on stage</string>
+    <string name="nest_presence_speaking">is speaking</string>
+    <string name="nest_presence_listening">joined as audience</string>
+    <string name="nest_presence_left">left the nest</string>
     <string name="nest_leave">Leave</string>
     <string name="nest_leave_host_title">End this nest?</string>
     <string name="nest_leave_host_body">You\'re the host. Closing the room will disconnect everyone. Choose \"Just leave\" if you want to come back later — the room will auto-close after 8 hours of inactivity.</string>