feat(desktop): add DM broadcast banner and fix empty room loading

- Fix ListChangeFeedViewModel stuck on Loading for empty chatrooms by
  adding invalidateData() call in init block
- Add DmBroadcastStatus sealed class and DmBroadcastBanner composable
  in commons for relay send progress display
- Add DmSendTracker using sendAndWaitForResponse for confirmed delivery
- Wire send tracking through DesktopIAccount into ChatPane banner
- Fix audit risks: unsubscribe DMs on account change, wait for relay
  connect before subscribing

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

commons/src/commonMain/kotlin/com/vitorpamplona/amethyst/commons/ui/chat/DmBroadcastBanner.kt

@@ -0,0 +1,133 @@
+/*
+ * 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.commons.ui.chat
+
+import androidx.compose.animation.AnimatedVisibility
+import androidx.compose.animation.expandVertically
+import androidx.compose.animation.fadeIn
+import androidx.compose.animation.fadeOut
+import androidx.compose.animation.shrinkVertically
+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.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.CheckCircle
+import androidx.compose.material.icons.filled.Error
+import androidx.compose.material.icons.filled.Sync
+import androidx.compose.material3.Icon
+import androidx.compose.material3.LinearProgressIndicator
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.dp
+
+@Composable
+fun DmBroadcastBanner(
+    status: DmBroadcastStatus,
+    modifier: Modifier = Modifier,
+) {
+    AnimatedVisibility(
+        visible = status !is DmBroadcastStatus.Idle,
+        enter = expandVertically() + fadeIn(),
+        exit = shrinkVertically() + fadeOut(),
+        modifier = modifier,
+    ) {
+        val isFailed = status is DmBroadcastStatus.Failed
+        val containerColor =
+            if (isFailed) {
+                MaterialTheme.colorScheme.errorContainer
+            } else {
+                MaterialTheme.colorScheme.surfaceContainerHigh
+            }
+        val contentColor =
+            if (isFailed) {
+                MaterialTheme.colorScheme.onErrorContainer
+            } else {
+                MaterialTheme.colorScheme.onSurface
+            }
+
+        Surface(
+            color = containerColor,
+            modifier = Modifier.fillMaxWidth(),
+        ) {
+            Column(
+                modifier = Modifier.padding(horizontal = 12.dp, vertical = 8.dp),
+            ) {
+                Row(
+                    verticalAlignment = Alignment.CenterVertically,
+                    horizontalArrangement = Arrangement.spacedBy(8.dp),
+                ) {
+                    val icon =
+                        when (status) {
+                            is DmBroadcastStatus.Subscribing,
+                            is DmBroadcastStatus.Sending,
+                            -> Icons.Default.Sync
+
+                            is DmBroadcastStatus.Sent -> Icons.Default.CheckCircle
+
+                            is DmBroadcastStatus.Failed -> Icons.Default.Error
+
+                            is DmBroadcastStatus.Idle -> Icons.Default.Sync
+                        }
+
+                    Icon(
+                        imageVector = icon,
+                        contentDescription = null,
+                        modifier = Modifier.size(16.dp),
+                        tint = contentColor,
+                    )
+
+                    Spacer(Modifier.width(4.dp))
+
+                    Text(
+                        text =
+                            when (status) {
+                                is DmBroadcastStatus.Subscribing -> "Connecting to DM relays..."
+                                is DmBroadcastStatus.Sending -> "Sending message... [${status.successCount}/${status.totalRelays}]"
+                                is DmBroadcastStatus.Sent -> "Sent to ${status.relayCount} relays"
+                                is DmBroadcastStatus.Failed -> "Send failed: ${status.error}"
+                                is DmBroadcastStatus.Idle -> ""
+                            },
+                        style = MaterialTheme.typography.labelMedium,
+                        color = contentColor,
+                    )
+                }
+
+                if (status is DmBroadcastStatus.Sending) {
+                    LinearProgressIndicator(
+                        progress = { status.progress },
+                        modifier = Modifier.fillMaxWidth().padding(top = 4.dp),
+                        color = MaterialTheme.colorScheme.primary,
+                        trackColor = MaterialTheme.colorScheme.surfaceVariant,
+                    )
+                }
+            }
+        }
+    }
+}

commons/src/commonMain/kotlin/com/vitorpamplona/amethyst/commons/ui/chat/DmBroadcastStatus.kt

@@ -0,0 +1,46 @@
+/*
+ * 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.commons.ui.chat
+
+import androidx.compose.runtime.Immutable
+
+@Immutable
+sealed class DmBroadcastStatus {
+    data object Idle : DmBroadcastStatus()
+
+    data object Subscribing : DmBroadcastStatus()
+
+    data class Sending(
+        val successCount: Int,
+        val totalRelays: Int,
+    ) : DmBroadcastStatus() {
+        val progress: Float
+            get() = if (totalRelays > 0) successCount.toFloat() / totalRelays else 0f
+    }
+
+    data class Sent(
+        val relayCount: Int,
+    ) : DmBroadcastStatus()
+
+    data class Failed(
+        val error: String,
+    ) : DmBroadcastStatus()
+}

commons/src/commonMain/kotlin/com/vitorpamplona/amethyst/commons/viewmodels/ListChangeFeedViewModel.kt

@@ -47,6 +47,10 @@ abstract class ListChangeFeedViewModel(
 
     init {
         Log.d("Init", "Starting new Model: ${this::class.simpleName}")
+        // Trigger initial load so empty rooms show Empty instead of Loading
+        viewModelScope.launch(Dispatchers.IO) {
+            feedState.invalidateData(ignoreIfDoing = false)
+        }
         viewModelScope.launch(Dispatchers.IO) {
             localFilter.changesFlow().collect {
                 Log.d("Init", "Collecting changes to: ${this@ListChangeFeedViewModel::class.simpleName}")

desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/Main.kt

@@ -96,12 +96,14 @@ import com.vitorpamplona.amethyst.desktop.ui.ThreadScreen
 import com.vitorpamplona.amethyst.desktop.ui.UserProfileScreen
 import com.vitorpamplona.amethyst.desktop.ui.ZapFeedback
 import com.vitorpamplona.amethyst.desktop.ui.chats.DesktopMessagesScreen
+import com.vitorpamplona.amethyst.desktop.ui.chats.DmSendTracker
 import com.vitorpamplona.amethyst.desktop.ui.profile.ProfileInfoCard
 import com.vitorpamplona.amethyst.desktop.ui.relay.RelayStatusCard
 import com.vitorpamplona.quartz.nip47WalletConnect.Nip47WalletConnect
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.launch
 
 private val isMacOS = System.getProperty("os.name").lowercase().contains("mac")
@@ -284,10 +286,16 @@ fun App(
         }
     }
 
-    // Subscribe to DMs when user logs in
+    // Subscribe to DMs when user logs in; unsubscribe on account change
     LaunchedEffect(accountState) {
+        // Clean up previous DM subscriptions on any account change (logout, switch)
+        subscriptionsCoordinator.unsubscribeFromDms()
+
         val currentAccount = accountState
         if (currentAccount is AccountState.LoggedIn) {
+            // Wait for at least one relay to connect before subscribing
+            relayManager.connectedRelays.first { it.isNotEmpty() }
+
             val dmRelayState =
                 DesktopDmRelayState(
                     dmRelayList = kotlinx.coroutines.flow.MutableStateFlow(emptySet()),
@@ -535,9 +543,13 @@ fun MainContent(
                     }
 
                     DesktopScreen.Messages -> {
+                        val dmSendTracker =
+                            remember(relayManager) {
+                                DmSendTracker(relayManager.client)
+                            }
                         val iAccount =
-                            remember(account, localCache, relayManager) {
+                            remember(account, localCache, relayManager, dmSendTracker) {
-                                DesktopIAccount(account, localCache, relayManager)
+                                DesktopIAccount(account, localCache, relayManager, dmSendTracker, scope)
                             }
                         DesktopMessagesScreen(
                             account = iAccount,

desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/model/DesktopIAccount.kt

@@ -28,6 +28,7 @@ import com.vitorpamplona.amethyst.commons.model.privateChats.ChatroomList
 import com.vitorpamplona.amethyst.desktop.account.AccountState
 import com.vitorpamplona.amethyst.desktop.cache.DesktopLocalCache
 import com.vitorpamplona.amethyst.desktop.network.RelayConnectionManager
+import com.vitorpamplona.amethyst.desktop.ui.chats.DmSendTracker
 import com.vitorpamplona.quartz.nip01Core.signers.EventTemplate
 import com.vitorpamplona.quartz.nip01Core.signers.NostrSigner
 import com.vitorpamplona.quartz.nip04Dm.messages.PrivateDmEvent
@@ -41,6 +42,8 @@ import com.vitorpamplona.quartz.nip57Zaps.IPrivateZapsDecryptionCache
 import com.vitorpamplona.quartz.nip57Zaps.LnZapRequestEvent
 import com.vitorpamplona.quartz.nip59Giftwrap.wraps.GiftWrapEvent
 import com.vitorpamplona.quartz.utils.DualCase
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.launch
 
 /**
  * Desktop implementation of IAccount.
@@ -55,6 +58,8 @@ class DesktopIAccount(
     private val accountState: AccountState.LoggedIn,
     private val localCache: DesktopLocalCache,
     private val relayManager: RelayConnectionManager,
+    val dmSendTracker: DmSendTracker,
+    private val scope: CoroutineScope,
 ) : IAccount {
     override val signer: NostrSigner = accountState.signer
 
@@ -114,7 +119,7 @@ class DesktopIAccount(
             }
         }
 
-        relayManager.send(signedEvent, targetRelays)
+        scope.launch { dmSendTracker.sendAndTrack(signedEvent, targetRelays) }
     }
 
     override suspend fun sendNip17PrivateMessage(template: EventTemplate<ChatMessageEvent>) {
@@ -122,7 +127,7 @@ class DesktopIAccount(
 
         val result = NIP17Factory().createMessageNIP17(template, signer)
 
-        // Broadcast each gift wrap to the recipient's inbox relays
+        // Broadcast each gift wrap to the recipient's inbox relays with tracking
         result.wraps.forEach { wrap ->
             val recipientKey = wrap.recipientPubKey()
             val targetRelays =
@@ -138,7 +143,7 @@ class DesktopIAccount(
                     relayManager.connectedRelays.value
                 }
 
-            relayManager.send(wrap, targetRelays)
+            scope.launch { dmSendTracker.sendAndTrack(wrap, targetRelays) }
         }
     }
 
@@ -158,7 +163,7 @@ class DesktopIAccount(
                     relayManager.connectedRelays.value
                 }
 
-            relayManager.send(wrap, targetRelays)
+            scope.launch { dmSendTracker.sendAndTrack(wrap, targetRelays) }
         }
     }
 }

desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/chats/ChatPane.kt

@@ -79,6 +79,8 @@ import com.vitorpamplona.amethyst.commons.model.User
 import com.vitorpamplona.amethyst.commons.model.cache.ICacheProvider
 import com.vitorpamplona.amethyst.commons.ui.chat.ChatMessageCompose
 import com.vitorpamplona.amethyst.commons.ui.chat.ChatroomHeader
+import com.vitorpamplona.amethyst.commons.ui.chat.DmBroadcastBanner
+import com.vitorpamplona.amethyst.commons.ui.chat.DmBroadcastStatus
 import com.vitorpamplona.amethyst.commons.ui.chat.GroupChatroomHeader
 import com.vitorpamplona.amethyst.commons.ui.components.LoadingState
 import com.vitorpamplona.amethyst.commons.ui.feeds.FeedState
@@ -114,6 +116,7 @@ fun ChatPane(
     cacheProvider: ICacheProvider,
     feedViewModel: ChatroomFeedViewModel,
     messageState: ChatNewMessageState,
+    dmBroadcastStatus: DmBroadcastStatus = DmBroadcastStatus.Idle,
     onNavigateToProfile: (String) -> Unit = {},
     modifier: Modifier = Modifier,
 ) {
@@ -157,6 +160,9 @@ fun ChatPane(
 
         HorizontalDivider()
 
+        // Broadcast status banner
+        DmBroadcastBanner(status = dmBroadcastStatus)
+
         // Message list
         Box(modifier = Modifier.weight(1f).fillMaxWidth()) {
             when (feedState) {

desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/chats/DesktopMessagesScreen.kt

@@ -54,8 +54,10 @@ import androidx.compose.ui.input.key.type
 import androidx.compose.ui.unit.dp
 import com.vitorpamplona.amethyst.commons.model.IAccount
 import com.vitorpamplona.amethyst.commons.model.cache.ICacheProvider
+import com.vitorpamplona.amethyst.commons.ui.chat.DmBroadcastStatus
 import com.vitorpamplona.amethyst.commons.viewmodels.ChatNewMessageState
 import com.vitorpamplona.amethyst.commons.viewmodels.ChatroomFeedViewModel
+import com.vitorpamplona.amethyst.desktop.model.DesktopIAccount
 
 private val isMacOS = System.getProperty("os.name").lowercase().contains("mac")
 
@@ -138,12 +140,22 @@ fun DesktopMessagesScreen(
                         ChatNewMessageState(account, cacheProvider, scope)
                     }
 
+                val broadcastStatus =
+                    if (account is DesktopIAccount) {
+                        account.dmSendTracker.status
+                            .collectAsState()
+                            .value
+                    } else {
+                        DmBroadcastStatus.Idle
+                    }
+
                 ChatPane(
                     roomKey = currentRoom,
                     account = account,
                     cacheProvider = cacheProvider,
                     feedViewModel = feedViewModel,
                     messageState = messageState,
+                    dmBroadcastStatus = broadcastStatus,
                     onNavigateToProfile = onNavigateToProfile,
                 )
             } else {

desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/chats/DmSendTracker.kt

@@ -0,0 +1,64 @@
+/*
+ * 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.desktop.ui.chats
+
+import com.vitorpamplona.amethyst.commons.ui.chat.DmBroadcastStatus
+import com.vitorpamplona.quartz.nip01Core.core.Event
+import com.vitorpamplona.quartz.nip01Core.relay.client.INostrClient
+import com.vitorpamplona.quartz.nip01Core.relay.client.accessories.sendAndWaitForResponse
+import com.vitorpamplona.quartz.nip01Core.relay.normalizer.NormalizedRelayUrl
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+
+class DmSendTracker(
+    private val client: INostrClient,
+) {
+    private val _status = MutableStateFlow<DmBroadcastStatus>(DmBroadcastStatus.Idle)
+    val status: StateFlow<DmBroadcastStatus> = _status.asStateFlow()
+
+    suspend fun sendAndTrack(
+        event: Event,
+        relays: Set<NormalizedRelayUrl>,
+    ) {
+        if (relays.isEmpty()) {
+            _status.value = DmBroadcastStatus.Failed("No relays available")
+            delay(3000)
+            _status.value = DmBroadcastStatus.Idle
+            return
+        }
+
+        _status.value = DmBroadcastStatus.Sending(0, relays.size)
+
+        val success = client.sendAndWaitForResponse(event, relays, 10)
+
+        _status.value =
+            if (success) {
+                DmBroadcastStatus.Sent(relays.size)
+            } else {
+                DmBroadcastStatus.Failed("No relay accepted the message")
+            }
+
+        delay(3000)
+        _status.value = DmBroadcastStatus.Idle
+    }
+}