feat(audio-rooms): host hand-raise queue UI (T1 #5)

Surfaces audience members who raised their hand (kind-10312
presence with `hand=1`) and gives the host a one-tap "Approve"
button that promotes them to SPEAKER via
RoomParticipantActions.setRole.

  HandRaiseQueueSection — Compose section visible host-only.
  Filters the VM's `presences` map to entries where
  handRaised=true AND the pubkey isn't already a host / moderator /
  speaker (they wouldn't have raised their hand if they could
  already speak). Hidden when the queue is empty so a quiet room
  doesn't gain a placeholder.

  AudioRoomFullScreen — gates the section on `isHost` and stitches
  it in below the audience row.

  Strings: `audio_room_hand_raise_queue_title`,
           `audio_room_hand_raise_approve`.

Approve flow:
  presence.hand=1 → RoomParticipantActions.setRole(event, target,
  ROLE.SPEAKER) → account.signAndComputeBroadcast → relay sees
  same `d`-tag → kind-30312 replaced. The promoted user's
  participant tag now reports canSpeak() == true; their VM's
  startBroadcast() gating in commons unblocks them automatically
  on the next render.

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/audiorooms/room/AudioRoomFullScreen.kt

@@ -190,6 +190,14 @@ internal fun AudioRoomFullScreen(
             )
         }
 
+        if (isHost) {
+            HandRaiseQueueSection(
+                event = event,
+                viewModel = viewModel,
+                accountViewModel = accountViewModel,
+            )
+        }
+
         ConnectionRow(viewModel = viewModel, ui = ui)
 
         val myPubkey = accountViewModel.account.signer.pubKey

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/audiorooms/room/HandRaiseQueueSection.kt

@@ -0,0 +1,120 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.amethyst.ui.screen.loggedIn.audiorooms.room
+
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.width
+import androidx.compose.material3.Button
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.dp
+import com.vitorpamplona.amethyst.R
+import com.vitorpamplona.amethyst.commons.viewmodels.AudioRoomViewModel
+import com.vitorpamplona.amethyst.ui.note.ClickableUserPicture
+import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
+import com.vitorpamplona.amethyst.ui.stringRes
+import com.vitorpamplona.amethyst.ui.theme.Size35dp
+import com.vitorpamplona.quartz.nip53LiveActivities.meetingSpaces.MeetingSpaceEvent
+import com.vitorpamplona.quartz.nip53LiveActivities.streaming.tags.ROLE
+import kotlinx.coroutines.launch
+
+/**
+ * Host-only queue of audience members whose latest kind-10312
+ * presence has `hand=1` AND who aren't already a host / moderator /
+ * speaker (they wouldn't have raised their hand if they could
+ * already speak). Each row has an "Approve" button that promotes
+ * the user to SPEAKER via [RoomParticipantActions.setRole].
+ *
+ * Hidden when the queue is empty so it doesn't take up vertical
+ * space on a quiet room.
+ *
+ * Visibility gating to host-only is the caller's responsibility.
+ */
+@Composable
+internal fun HandRaiseQueueSection(
+    event: MeetingSpaceEvent,
+    viewModel: AudioRoomViewModel,
+    accountViewModel: AccountViewModel,
+    modifier: Modifier = Modifier,
+) {
+    val presences by viewModel.presences.collectAsState()
+    val onStageKeys =
+        event
+            .participants()
+            .filter { it.canSpeak() }
+            .map { it.pubKey }
+            .toSet()
+    val hands =
+        presences.values
+            .filter { it.handRaised && it.pubkey !in onStageKeys }
+            .sortedBy { it.updatedAtSec }
+
+    if (hands.isEmpty()) return
+
+    val scope = rememberCoroutineScope()
+    Column(modifier = modifier.fillMaxWidth().padding(top = 12.dp)) {
+        Text(
+            text = stringRes(R.string.audio_room_hand_raise_queue_title),
+            style = MaterialTheme.typography.labelMedium,
+            color = MaterialTheme.colorScheme.onSurfaceVariant,
+        )
+        hands.forEach { hand ->
+            Row(
+                modifier = Modifier.fillMaxWidth().padding(top = 6.dp),
+                verticalAlignment = Alignment.CenterVertically,
+                horizontalArrangement = Arrangement.spacedBy(8.dp),
+            ) {
+                ClickableUserPicture(
+                    baseUserHex = hand.pubkey,
+                    size = Size35dp,
+                    accountViewModel = accountViewModel,
+                )
+                Text(
+                    text = hand.pubkey.take(8),
+                    style = MaterialTheme.typography.bodyMedium,
+                    modifier = Modifier.weight(1f),
+                )
+                Spacer(Modifier.width(4.dp))
+                Button(
+                    onClick = {
+                        scope.launch {
+                            val template = RoomParticipantActions.setRole(event, hand.pubkey, ROLE.SPEAKER)
+                            template?.let { runCatching { accountViewModel.account.signAndComputeBroadcast(it) } }
+                        }
+                    },
+                ) {
+                    Text(stringRes(R.string.audio_room_hand_raise_approve))
+                }
+            }
+        }
+    }
+}

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

@@ -534,6 +534,8 @@
     <string name="audio_room_edit_save">Save</string>
     <string name="audio_room_close_action">Close room</string>
     <string name="audio_room_overflow_menu">Room actions</string>
+    <string name="audio_room_hand_raise_queue_title">Raised hands</string>
+    <string name="audio_room_hand_raise_approve">Approve</string>
     <string name="audio_room_create_fab">Start space</string>
     <string name="audio_room_create_title">Start a new audio room</string>
     <string name="audio_room_create_field_room">Room name</string>