fix nests room host UX: visible toasts, promote propagation, edit-sheet keyboard, reaction animation

This commit bundles several issues surfaced while testing host actions
inside an audio room.

NestActivity didn't mount `DisplayErrorMessages`, so every toast emitted
by nest code (promote, demote, kick, force-mute, errors) queued into a
StateFlow whose only collector lives in MainActivity. Mounted it inside
NestActivity.setContent so toasts now render in front of the room UI —
same way the leave-confirmation AlertDialog already does.

Host actions used to fire a synchronous "Promoted X" toast regardless of
whether `signAndComputeBroadcast` actually completed. Silent signer
failures (TimedOut, ManuallyUnauthorized, CouldNotPerform, etc. — all
Log.w-only in launchSigner) were invisible from the host's POV. Replaced
with a coroutine-bound failure toast that surfaces the exception class
+ message; success is implicit via the UI update.

The real cause of "promoted user stays in audience tab" turned out to be
stale presence: a kind-10312 emitted before the role grant (with
onstage=0) was pinning the freshly-promoted speaker to the audience tab.
buildParticipantGrid now takes a `roleGrantSec` parameter (the
kind-30312 created_at) and treats presence as authoritative only when
strictly newer. Pinned with two new tests covering both the
stale-ignore and fresh-respect cases. The leave-stage-on-another-client
flow keeps working because that emits a fresh onstage=0.

RoomParticipantActions.rebuild now uses
`(original.createdAt + 1L).coerceAtLeast(now())` so a same-second
promote→demote can't tie-break the wrong way under NIP-01's lowest-id
rule.

EditNestSheet's bottom row got squashed when the keyboard appeared —
the form fields couldn't shrink, so the Save/Cancel/Close row took the
hit. Split into a scrollable form column + sticky action row, wrapped
the outer column in imePadding.

SpeakerReactionOverlay was driving drift on a 100 ms `delay` loop over
the 10 s eviction window — produced 0.16 dp per tick (visibly stepped)
and the chip barely moved before disappearing. Replaced with
`Animatable.animateTo` on Compose's frame clock and a 6 s duration so
the chip pops, lingers visibly, then drifts up and fades.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/nests/room/activity/NestActivity.kt

@@ -38,6 +38,8 @@ import com.vitorpamplona.amethyst.R
 import com.vitorpamplona.amethyst.service.relayClient.authCommand.compose.RelayAuthSubscription
 import com.vitorpamplona.amethyst.service.relayClient.reqCommand.account.AccountFilterAssemblerSubscription
 import com.vitorpamplona.amethyst.ui.StringResSetup
+import com.vitorpamplona.amethyst.ui.components.toasts.DisplayErrorMessages
+import com.vitorpamplona.amethyst.ui.navigation.navs.EmptyNav
 import com.vitorpamplona.amethyst.ui.screen.ManageRelayServices
 import com.vitorpamplona.amethyst.ui.screen.ManageWebOkHttp
 import com.vitorpamplona.amethyst.ui.theme.AmethystTheme
@@ -190,6 +192,24 @@ class NestActivity : AppCompatActivity() {
                     onLeave = { finish() },
                     onMinimize = { enterPip() },
                 )
+
+                // Mirror MainActivity's `AppNavigation` → render toasts
+                // inside *this* Activity's Compose tree so promote /
+                // demote / kick / room-edit results actually surface in
+                // front of the room UI. Without this, every
+                // `toastManager.toast(...)` from nest code queues into a
+                // StateFlow whose only collector lives in MainActivity —
+                // the dialog only becomes visible after the user PIPs out.
+                // EmptyNav is the documented stub for hosts that have no
+                // navigation graph; the only consumer that reads `nav`
+                // is `MultiErrorToastMsg` (zap-error aggregator) — nest
+                // call sites emit `ResourceToastMsg` / `StringToastMsg`
+                // which don't touch nav.
+                DisplayErrorMessages(
+                    toastManager = accountViewModel.toastManager,
+                    accountViewModel = accountViewModel,
+                    nav = EmptyNav(),
+                )
             }
         }
     }

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/nests/room/activity/NestActivityContent.kt

@@ -251,6 +251,14 @@ private fun NestActivityBody(
                 participants = event.participants(),
                 presences = presences,
                 hostPubkey = event.pubKey,
+                // Treat presence as authoritative only when fresher
+                // than the role grant. nostrnests audience members
+                // emit kind-10312 with `onstage=0` and never flip
+                // it back on after a promotion — without this gate,
+                // a freshly-promoted speaker would render in the
+                // audience tab with role=SPEAKER, looking unchanged
+                // to the host who just promoted them.
+                roleGrantSec = event.createdAt,
             )
         }
     val onStageKeys =

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/nests/room/edit/EditNestSheet.kt

@@ -26,9 +26,12 @@ import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.imePadding
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.verticalScroll
 import androidx.compose.material3.Button
 import androidx.compose.material3.ButtonDefaults
 import androidx.compose.material3.CircularProgressIndicator
@@ -108,60 +111,80 @@ fun EditNestSheet(
         )
     }
     ModalBottomSheet(onDismissRequest = onDismiss, sheetState = sheetState) {
+        // Two-region layout so the keyboard never squashes the action
+        // row: the form scrolls inside its own viewport, the bottom
+        // buttons stay anchored. `imePadding()` on the outer Column
+        // lifts the whole sheet above the keyboard, so the anchored
+        // row sits just above the IME instead of behind it.
         Column(
-            modifier = Modifier.fillMaxWidth().padding(horizontal = 16.dp, vertical = 8.dp),
+            modifier = Modifier.fillMaxWidth().imePadding(),
-            verticalArrangement = Arrangement.spacedBy(8.dp),
         ) {
-            Text(
+            Column(
-                text = stringRes(R.string.nest_edit_title),
+                modifier =
-                style = MaterialTheme.typography.titleLarge,
+                    Modifier
-            )
+                        .fillMaxWidth()
-
+                        .weight(1f, fill = false)
-            OutlinedTextField(
+                        .verticalScroll(rememberScrollState())
-                value = state.roomName,
+                        .padding(horizontal = 16.dp, vertical = 8.dp),
-                onValueChange = viewModel::setRoomName,
+                verticalArrangement = Arrangement.spacedBy(8.dp),
-                label = { Text(stringRes(R.string.nest_create_field_room)) },
+            ) {
-                singleLine = true,
-                modifier = Modifier.fillMaxWidth(),
-            )
-            OutlinedTextField(
-                value = state.summary,
-                onValueChange = viewModel::setSummary,
-                label = { Text(stringRes(R.string.nest_create_field_summary)) },
-                modifier = Modifier.fillMaxWidth(),
-            )
-            OutlinedTextField(
-                value = state.serviceUrl,
-                onValueChange = viewModel::setServiceUrl,
-                label = { Text(stringRes(R.string.nest_create_field_service)) },
-                singleLine = true,
-                modifier = Modifier.fillMaxWidth(),
-            )
-            OutlinedTextField(
-                value = state.endpointUrl,
-                onValueChange = viewModel::setEndpointUrl,
-                label = { Text(stringRes(R.string.nest_create_field_endpoint)) },
-                singleLine = true,
-                modifier = Modifier.fillMaxWidth(),
-            )
-            OutlinedTextField(
-                value = state.imageUrl,
-                onValueChange = viewModel::setImageUrl,
-                label = { Text(stringRes(R.string.nest_create_field_image)) },
-                singleLine = true,
-                modifier = Modifier.fillMaxWidth(),
-            )
-
-            state.error?.let { error ->
                 Text(
-                    text = error,
+                    text = stringRes(R.string.nest_edit_title),
-                    color = MaterialTheme.colorScheme.error,
+                    style = MaterialTheme.typography.titleLarge,
-                    style = MaterialTheme.typography.bodySmall,
                 )
-            }
 
-            Spacer(Modifier.height(4.dp))
+                OutlinedTextField(
-            Row(modifier = Modifier.fillMaxWidth(), horizontalArrangement = Arrangement.SpaceBetween) {
+                    value = state.roomName,
+                    onValueChange = viewModel::setRoomName,
+                    label = { Text(stringRes(R.string.nest_create_field_room)) },
+                    singleLine = true,
+                    modifier = Modifier.fillMaxWidth(),
+                )
+                OutlinedTextField(
+                    value = state.summary,
+                    onValueChange = viewModel::setSummary,
+                    label = { Text(stringRes(R.string.nest_create_field_summary)) },
+                    modifier = Modifier.fillMaxWidth(),
+                )
+                OutlinedTextField(
+                    value = state.serviceUrl,
+                    onValueChange = viewModel::setServiceUrl,
+                    label = { Text(stringRes(R.string.nest_create_field_service)) },
+                    singleLine = true,
+                    modifier = Modifier.fillMaxWidth(),
+                )
+                OutlinedTextField(
+                    value = state.endpointUrl,
+                    onValueChange = viewModel::setEndpointUrl,
+                    label = { Text(stringRes(R.string.nest_create_field_endpoint)) },
+                    singleLine = true,
+                    modifier = Modifier.fillMaxWidth(),
+                )
+                OutlinedTextField(
+                    value = state.imageUrl,
+                    onValueChange = viewModel::setImageUrl,
+                    label = { Text(stringRes(R.string.nest_create_field_image)) },
+                    singleLine = true,
+                    modifier = Modifier.fillMaxWidth(),
+                )
+
+                state.error?.let { error ->
+                    Text(
+                        text = error,
+                        color = MaterialTheme.colorScheme.error,
+                        style = MaterialTheme.typography.bodySmall,
+                    )
+                }
+
+                Spacer(Modifier.height(4.dp))
+            }
+            Row(
+                modifier =
+                    Modifier
+                        .fillMaxWidth()
+                        .padding(horizontal = 16.dp, vertical = 8.dp),
+                horizontalArrangement = Arrangement.SpaceBetween,
+            ) {
                 // Destructive — flips status to CLOSED with the same d-tag
                 // so subscribers see the room go dark. Confirm prompt
                 // gates the actual publish so a misclick on the

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/nests/room/participants/ParticipantHostActionsSheet.kt

@@ -50,6 +50,7 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.unit.dp
+import androidx.lifecycle.viewModelScope
 import com.vitorpamplona.amethyst.R
 import com.vitorpamplona.amethyst.commons.viewmodels.NestViewModel
 import com.vitorpamplona.amethyst.commons.viewmodels.RoomSpeakerCatalog
@@ -71,6 +72,9 @@ import com.vitorpamplona.quartz.nip01Core.tags.aTag.ATag
 import com.vitorpamplona.quartz.nip19Bech32.entities.NPub
 import com.vitorpamplona.quartz.nip53LiveActivities.meetingSpaces.MeetingSpaceEvent
 import com.vitorpamplona.quartz.nip53LiveActivities.streaming.tags.ROLE
+import kotlinx.coroutines.CancellationException
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
 
 /**
  * Per-participant context sheet (T2 #2). Long-press on any participant
@@ -100,12 +104,12 @@ internal fun ParticipantHostActionsSheet(
     val sheetState = rememberModalBottomSheetState(skipPartiallyExpanded = true)
     val targetUser = remember(target) { LocalCache.getOrCreateUser(target) }
 
-    // Reactive display name — UsernameDisplay observes this for the
+    // Reactive display name for confirmation-dialog bodies (kick /
-    // header, and we reuse the same flow for toast text so the header
+    // force-mute) — `observeUserInfo` lets the dialog text track a
-    // and toast never disagree (e.g. metadata arriving mid-sheet).
+    // late-arriving metadata event without re-opening the sheet.
     val userInfo by observeUserInfo(targetUser, accountViewModel)
     val displayName = userInfo?.info?.bestName() ?: targetUser.pubkeyDisplayHex()
-    val toasts = rememberParticipantToasts(displayName)
+    val toasts = rememberParticipantToasts()
 
     var openDialog by rememberSaveable(stateSaver = SheetDialogSaver) {
         mutableStateOf<SheetDialog?>(null)
@@ -174,7 +178,6 @@ internal fun ParticipantHostActionsSheet(
                     //      so future presence events don't re-render them
                     broadcast(accountViewModel, AdminCommandEvent.kick(roomATag, target))
                     broadcast(accountViewModel, RoomParticipantActions.removeParticipant(event, target))
-                    accountViewModel.toastManager.toast(toasts.title, toasts.kickSent)
                     onDismiss()
                 },
                 onDismiss = { openDialog = null },
@@ -190,7 +193,6 @@ internal fun ParticipantHostActionsSheet(
                     openDialog = null
                     val roomATag = ATag(event.kind, event.pubKey, event.dTag(), null)
                     broadcast(accountViewModel, AdminCommandEvent.forceMute(roomATag, target))
-                    accountViewModel.toastManager.toast(toasts.title, toasts.forceMuteSent)
                     onDismiss()
                 },
                 onDismiss = { openDialog = null },
@@ -273,10 +275,8 @@ private fun AudienceActions(
     ) {
         if (isFollowing) {
             accountViewModel.unfollow(targetUser)
-            accountViewModel.toastManager.toast(toasts.title, toasts.unfollowSent)
         } else {
             accountViewModel.follow(targetUser)
-            accountViewModel.toastManager.toast(toasts.title, toasts.followSent)
         }
         onDismiss()
     }
@@ -289,10 +289,8 @@ private fun AudienceActions(
     ) {
         if (isHidden) {
             accountViewModel.show(targetUser)
-            accountViewModel.toastManager.toast(toasts.title, toasts.unmuteSent)
         } else {
             accountViewModel.hide(targetUser)
-            accountViewModel.toastManager.toast(toasts.title, toasts.muteSent)
         }
         onDismiss()
     }
@@ -337,13 +335,22 @@ private fun HostActions(
     val nestPresences by nestViewModel.presences.collectAsState()
     val targetIsBroadcasting = nestPresences[target]?.publishing == true
 
-    fun hostAction(
+    fun hostAction(template: EventTemplate<out Event>?) {
-        template: EventTemplate<out Event>?,
+        // Sign+publish runs inside a coroutine that surfaces ANY
-        toastMsg: String,
+        // failure as a toast. Success is confirmed by the UI moving
-    ) {
+        // the target between stage/audience (or removing them), so
-        broadcast(accountViewModel, template)
+        // no success toast is needed — the previous "Promoted X"
-        accountViewModel.toastManager.toast(toasts.title, toastMsg)
+        // toast was redundant once the kind-30312 + stale-presence
+        // fixes made the grid update visible. Silent signer failures
+        // (NIP-46 timeout, manual denial, etc.) still need to
+        // surface because they're invisible from the host's POV.
+        if (template == null) {
+            accountViewModel.toastManager.toast(toasts.failedTitle, toasts.failedTemplateNull)
+            onDismiss()
+            return
+        }
         onDismiss()
+        broadcastWithDiagnostics(accountViewModel, template, toasts.failedTitle)
     }
 
     Spacer(Modifier.height(4.dp))
@@ -353,12 +360,12 @@ private fun HostActions(
     // wasted relay traffic and an obvious UX tell.
     if (targetRole != ROLE.SPEAKER) {
         ActionRow(stringRes(R.string.nest_promote_speaker)) {
-            hostAction(RoomParticipantActions.setRole(event, target, ROLE.SPEAKER), toasts.promoteSpeakerSent)
+            hostAction(RoomParticipantActions.setRole(event, target, ROLE.SPEAKER))
         }
     }
     if (targetRole != ROLE.MODERATOR) {
         ActionRow(stringRes(R.string.nest_promote_moderator)) {
-            hostAction(RoomParticipantActions.setRole(event, target, ROLE.MODERATOR), toasts.promoteModeratorSent)
+            hostAction(RoomParticipantActions.setRole(event, target, ROLE.MODERATOR))
         }
     }
     // Demote only when the target actually has a role above listener —
@@ -366,7 +373,7 @@ private fun HostActions(
     // and the visible row sets up a misleading expectation.
     if (targetRole != null && targetRole != ROLE.PARTICIPANT) {
         ActionRow(stringRes(R.string.nest_demote_listener)) {
-            hostAction(RoomParticipantActions.demoteToListener(event, target), toasts.demoteListenerSent)
+            hostAction(RoomParticipantActions.demoteToListener(event, target))
         }
     }
     // Force-mute is honor-based: the target's client must honor the
@@ -498,6 +505,36 @@ private fun broadcast(
     accountViewModel.launchSigner { accountViewModel.account.signAndComputeBroadcast(template) }
 }
 
+/**
+ * Sign+publish a host-action template and surface only FAILURES as
+ * a toast. Success is implicit — the UI updates when the kind-30312
+ * round-trips, so a success toast would be redundant. Any throw
+ * (including the silent ones [launchSigner] Log.w-only's —
+ * `TimedOutException`, `ManuallyUnauthorizedException`,
+ * `CouldNotPerformException`,
+ * `RunningOnBackgroundWithoutAutomaticPermissionException`,
+ * `AutomaticallyUnauthorizedException`) becomes a visible error
+ * toast with the exception's class name + message so the host knows
+ * a remote-signer denial happened.
+ */
+private fun broadcastWithDiagnostics(
+    accountViewModel: AccountViewModel,
+    template: EventTemplate<out Event>,
+    failedTitle: String,
+) {
+    accountViewModel.viewModelScope.launch(Dispatchers.IO) {
+        try {
+            accountViewModel.account.signAndComputeBroadcast(template)
+        } catch (ce: CancellationException) {
+            throw ce
+        } catch (e: Throwable) {
+            val klass = e::class.simpleName ?: "Throwable"
+            val msg = e.message?.takeIf { it.isNotBlank() } ?: "no message"
+            accountViewModel.toastManager.toast(failedTitle, "$klass: $msg")
+        }
+    }
+}
+
 private fun openProfileInMainActivity(
     context: Context,
     target: String,
@@ -545,33 +582,17 @@ private val SheetDialogSaver: Saver<SheetDialog?, String> =
  * (which are not @Composable) read them by reference.
  */
 private data class ParticipantToasts(
-    val title: String,
+    val failedTitle: String,
-    val followSent: String,
+    val failedTemplateNull: String,
-    val unfollowSent: String,
-    val muteSent: String,
-    val unmuteSent: String,
-    val promoteSpeakerSent: String,
-    val promoteModeratorSent: String,
-    val demoteListenerSent: String,
-    val forceMuteSent: String,
-    val kickSent: String,
     val noAppMessage: String,
     val zapSplitUnsupported: String,
 )
 
 @Composable
-private fun rememberParticipantToasts(displayName: String): ParticipantToasts =
+private fun rememberParticipantToasts(): ParticipantToasts =
     ParticipantToasts(
-        title = stringRes(R.string.nest_toast_action_title),
+        failedTitle = stringRes(R.string.nest_toast_host_action_failed_title),
-        followSent = stringRes(R.string.nest_toast_follow_sent, displayName),
+        failedTemplateNull = stringRes(R.string.nest_toast_host_action_failed_template_null),
-        unfollowSent = stringRes(R.string.nest_toast_unfollow_sent, displayName),
-        muteSent = stringRes(R.string.nest_toast_mute_sent, displayName),
-        unmuteSent = stringRes(R.string.nest_toast_unmute_sent, displayName),
-        promoteSpeakerSent = stringRes(R.string.nest_toast_promote_speaker_sent, displayName),
-        promoteModeratorSent = stringRes(R.string.nest_toast_promote_moderator_sent, displayName),
-        demoteListenerSent = stringRes(R.string.nest_toast_demote_listener_sent, displayName),
-        forceMuteSent = stringRes(R.string.nest_toast_force_mute_sent, displayName),
-        kickSent = stringRes(R.string.nest_toast_kick_sent, displayName),
         noAppMessage = stringRes(R.string.nest_no_app_to_open_link),
         zapSplitUnsupported = stringRes(R.string.nest_participant_zap_split_unsupported),
     )

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/nests/room/participants/RoomParticipantActions.kt

@@ -30,6 +30,7 @@ import com.vitorpamplona.quartz.nip53LiveActivities.meetingSpaces.summary
 import com.vitorpamplona.quartz.nip53LiveActivities.meetingSpaces.tags.StatusTag
 import com.vitorpamplona.quartz.nip53LiveActivities.streaming.tags.ParticipantTag
 import com.vitorpamplona.quartz.nip53LiveActivities.streaming.tags.ROLE
+import com.vitorpamplona.quartz.utils.TimeUtils
 
 /**
  * Pure builders for participant-list mutations on a kind-30312
@@ -132,12 +133,25 @@ internal object RoomParticipantActions {
                 ?: ParticipantTag(original.pubKey, null, ROLE.HOST.code, null)
         val others = participants.filterNot { it.pubKey == host.pubKey }
 
+        // Strictly monotonic createdAt. NIP-01 replaceable-event
+        // semantics drop a new version whose createdAt is <= the
+        // previous one (with a lower-id tie-break that's effectively
+        // random under signing). Creating a room then immediately
+        // promoting in the same wall-clock second produced the
+        // dreaded silent-no-op: the local cache rejected the new
+        // event in `consumeBaseReplaceable` (strict `>`) and relays
+        // applied the same rule. `+ 1` is enough to win the tie;
+        // `coerceAtLeast(now)` keeps the wire timestamp accurate
+        // when the original is already in the past.
+        val nextCreatedAt = (original.createdAt + 1L).coerceAtLeast(TimeUtils.now())
+
         return MeetingSpaceEvent.build(
             room = original.room().orEmpty(),
             status = status,
             service = original.service().orEmpty(),
             host = host,
             dTag = original.dTag(),
+            createdAt = nextCreatedAt,
         ) {
             original.endpoint()?.let { endpoint(it) }
             original.summary()?.takeIf { it.isNotBlank() }?.let { summary(it) }

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/nests/room/stage/SpeakerReactionOverlay.kt

@@ -21,8 +21,8 @@
 package com.vitorpamplona.amethyst.ui.screen.loggedIn.nests.room.stage
 
 import androidx.compose.animation.AnimatedVisibility
-import androidx.compose.animation.core.LinearEasing
+import androidx.compose.animation.core.Animatable
-import androidx.compose.animation.core.animateFloatAsState
+import androidx.compose.animation.core.LinearOutSlowInEasing
 import androidx.compose.animation.core.tween
 import androidx.compose.animation.fadeIn
 import androidx.compose.animation.fadeOut
@@ -37,16 +37,11 @@ import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
-import androidx.compose.runtime.getValue
-import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
-import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.alpha
 import androidx.compose.ui.unit.dp
-import com.vitorpamplona.amethyst.commons.viewmodels.REACTION_WINDOW_SEC
 import com.vitorpamplona.amethyst.commons.viewmodels.RoomReaction
-import kotlinx.coroutines.delay
 
 /**
  * Floating-emoji overlay drawn under a speaker's avatar. Each chip
@@ -99,47 +94,46 @@ private fun ReactionChip(
     count: Int,
     youngestSec: Long,
 ) {
-    // Tick a [progress] state from 0f → 1f over the eviction window
+    // One-shot rise + fade keyed on [youngestSec], so a fresh
-    // so the chip can drift + fade in lockstep with how close it is
+    // reaction in the same emoji burst restarts the motion. The
-    // to falling out of the aggregator. Reset whenever a fresher
+    // previous implementation re-derived `progress` on a 100 ms
-    // reaction lands by re-keying on [youngestSec].
+    // `delay` loop over the 10 s eviction window — drift came out
-    var progress by remember(youngestSec) { mutableStateOf(0f) }
+    // to ~0.16 dp per tick (visibly stepped) and the rise barely
+    // moved over the full lifetime. Using `Animatable` drives the
+    // value on Compose's frame clock at full refresh rate, and the
+    // shorter [REACTION_RISE_MS] duration produces an actual
+    // pop-and-rise instead of a slow creep.
+    val rise = remember(youngestSec) { Animatable(0f) }
     LaunchedEffect(youngestSec) {
-        // Re-sync against wall-clock so a chip whose window started
+        // Wall-clock seed so a chip already mid-window when the
-        // before this composable mounted (e.g. user rotated the
+        // composable first mounts (e.g. recompose after rotation)
-        // device mid-burst) still ages correctly.
+        // picks up where it left off rather than restarting.
-        val ageMs = (System.currentTimeMillis() / 1000L - youngestSec).coerceAtLeast(0L) * 1000L
+        val ageMs = ((System.currentTimeMillis() / 1000L) - youngestSec).coerceAtLeast(0L) * 1000L
-        val remaining = (REACTION_WINDOW_MS - ageMs).coerceAtLeast(0L)
+        val startProgress = (ageMs.toFloat() / REACTION_RISE_MS.toFloat()).coerceIn(0f, 1f)
-        progress = (ageMs.toFloat() / REACTION_WINDOW_MS).coerceIn(0f, 1f)
+        rise.snapTo(startProgress)
-        if (remaining <= 0L) return@LaunchedEffect
+        val remainingMs = (REACTION_RISE_MS - ageMs).toInt().coerceAtLeast(0)
-        // 100 ms ticks keep the drift smooth without burning a frame
+        if (remainingMs > 0) {
-        // budget — the avatar is small and the chip's motion is
+            rise.animateTo(
-        // sub-pixel between ticks anyway.
+                targetValue = 1f,
-        val steps = (remaining / 100L).coerceAtLeast(1L)
+                animationSpec = tween(durationMillis = remainingMs, easing = LinearOutSlowInEasing),
-        repeat(steps.toInt()) {
+            )
-            delay(100L)
-            progress =
-                ((System.currentTimeMillis() / 1000L - youngestSec).toFloat() * 1000f / REACTION_WINDOW_MS)
-                    .coerceIn(0f, 1f)
         }
-        progress = 1f
     }
 
-    // Drift up by ~16 dp over the window so the chip reads as
+    val progress = rise.value
-    // "rising and dissipating", and fade out over the second half
+    // Final rise distance has to land within the participant cell's
-    // so the first half stays solidly readable.
+    // headroom — much past 24 dp clips into the avatar above on a
-    val driftDp = (-16f * progress).dp
+    // 75 dp grid cell.
-    val animatedAlpha by animateFloatAsState(
+    val driftDp = (-DRIFT_MAX_DP * progress).dp
-        targetValue = (1f - ((progress - 0.5f).coerceAtLeast(0f) * 2f)).coerceIn(0f, 1f),
+    // Solid for the first half, then fades linearly over the second
-        animationSpec = tween(durationMillis = 100, easing = LinearEasing),
+    // half so the reaction reads as "popping in, then dissipating".
-        label = "reaction-chip-alpha",
+    val alpha = (1f - ((progress - 0.5f).coerceAtLeast(0f) * 2f)).coerceIn(0f, 1f)
-    )
 
     Surface(
         modifier =
             Modifier
                 .offset(y = driftDp)
-                .alpha(animatedAlpha),
+                .alpha(alpha),
         shape = MaterialTheme.shapes.small,
         tonalElevation = 2.dp,
         shadowElevation = 1.dp,
@@ -154,4 +148,11 @@ private fun ReactionChip(
     }
 }
 
-private const val REACTION_WINDOW_MS = REACTION_WINDOW_SEC * 1000L
+// Rise + fade plays out well inside the 10 s eviction window so the
+// chip is fully transparent before the aggregator drops it from the
+// list (avoids a hard pop on removal). 6 s keeps the chip solidly
+// visible for ~3 s (alpha=1 holds for the first half) before the
+// fade begins — earlier 1.5 s and 4 s passes still read as a
+// "blink" relative to nostrnests' web reaction lifetime.
+private const val REACTION_RISE_MS = 6000L
+private const val DRIFT_MAX_DP = 28f

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

@@ -689,16 +689,8 @@
     <string name="nest_confirm_force_mute_body">Asks %1$s\'s client to mute its mic. Some clients may ignore this command.</string>
     <string name="nest_confirm_force_mute_confirm">Force-mute</string>
     <string name="nest_confirm_cancel">Cancel</string>
-    <string name="nest_toast_action_title">Audio room</string>
+    <string name="nest_toast_host_action_failed_title">Action failed</string>
-    <string name="nest_toast_follow_sent">Following %1$s.</string>
+    <string name="nest_toast_host_action_failed_template_null">The action could not be prepared.</string>
-    <string name="nest_toast_unfollow_sent">Unfollowed %1$s.</string>
-    <string name="nest_toast_mute_sent">Muted %1$s.</string>
-    <string name="nest_toast_unmute_sent">Unmuted %1$s.</string>
-    <string name="nest_toast_promote_speaker_sent">Promoted %1$s to speaker.</string>
-    <string name="nest_toast_promote_moderator_sent">Promoted %1$s to moderator.</string>
-    <string name="nest_toast_demote_listener_sent">Demoted %1$s to listener.</string>
-    <string name="nest_toast_force_mute_sent">Force-muted %1$s.</string>
-    <string name="nest_toast_kick_sent">Kicked %1$s from the room.</string>
     <string name="nest_share_action">Share room</string>
     <string name="nest_minimize">Minimize</string>
     <string name="nest_minimize_description">Minimize to keep listening</string>

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

@@ -69,6 +69,16 @@ data class ParticipantGrid(
  *     AND whose latest presence advertises `onstage != false`. A
  *     speaker who explicitly emitted `onstage=0` ("step off the
  *     stage") drops to audience without losing their role tag.
+ *
+ *     Caveat: a presence event is only honoured for the on-stage
+ *     gate when it's NEWER than the role grant ([roleGrantSec],
+ *     conservatively the kind-30312 `created_at`). Otherwise a
+ *     freshly-promoted audience member whose pre-promotion
+ *     `kind-10312` carried `onstage=0` would be pinned to the
+ *     audience tab until they re-heartbeat — which on nostrnests
+ *     never happens, since audience members there don't toggle
+ *     their `onstage` flag back on after a role bump. Stale
+ *     presence ⇒ trust the role.
  *   * Audience: every pubkey with recent presence that isn't on
  *     stage, plus participant-tagged users who haven't emitted
  *     presence yet (rendered as `absent = true`).
@@ -86,6 +96,7 @@ fun buildParticipantGrid(
     participants: List<ParticipantTag>,
     presences: Map<String, RoomPresence>,
     hostPubkey: HexKey? = null,
+    roleGrantSec: Long = 0L,
 ): ParticipantGrid {
     val effectiveParticipants =
         if (hostPubkey != null && participants.none { it.pubKey == hostPubkey }) {
@@ -103,7 +114,10 @@ fun buildParticipantGrid(
         val pres = presences[p.pubKey]
         val role = p.effectiveRole()
         val canSpeak = p.canSpeak()
-        val onstageFlag = pres?.onstage ?: true // default true for backwards compat
+        // Stale-presence override: trust the role when the presence
+        // event predates the role grant. See KDoc above for why.
+        val presenceIsFresh = pres != null && pres.updatedAtSec >= roleGrantSec
+        val onstageFlag = if (presenceIsFresh) pres.onstage else true
         val member =
             RoomMember(
                 pubkey = p.pubKey,

commons/src/commonTest/kotlin/com/vitorpamplona/amethyst/commons/viewmodels/ParticipantGridTest.kt

@@ -168,6 +168,50 @@ class ParticipantGridTest {
         assertEquals(ROLE.HOST, hostRow?.role)
     }
 
+    @Test
+    fun stalePresenceWithOnstageFalseIsIgnoredAfterRoleGrant() {
+        // Audience-promoted-to-speaker scenario: presence event was
+        // emitted at t=100 with onstage=false (their pre-promotion
+        // audience-mode kind-10312). The host then promotes them at
+        // t=200 (the room's new createdAt). Without the staleness
+        // gate, this lands the speaker in the audience tab even
+        // though their role just changed — the bug reported on
+        // 2026-05-13. With roleGrantSec=200, the t=100 presence is
+        // stale and the role tag wins → speaker on stage.
+        val grid =
+            buildParticipantGrid(
+                participants = listOf(pTag(host, ROLE.HOST), pTag(speaker, ROLE.SPEAKER)),
+                presences =
+                    mapOf(
+                        host to presence(host, 200L),
+                        speaker to presence(speaker, 100L, onstage = false),
+                    ),
+                roleGrantSec = 200L,
+            )
+        assertEquals(setOf(host, speaker), grid.onStage.map { it.pubkey }.toSet())
+        assertEquals(0, grid.audience.size)
+    }
+
+    @Test
+    fun freshOnstageFalseAfterRoleGrantStillDropsToAudience() {
+        // Inverse: speaker emits onstage=0 AFTER the role grant
+        // (deliberate "stepped off stage" while keeping the role).
+        // Should still drop to audience — the existing leave-stage
+        // contract.
+        val grid =
+            buildParticipantGrid(
+                participants = listOf(pTag(host, ROLE.HOST), pTag(speaker, ROLE.SPEAKER)),
+                presences =
+                    mapOf(
+                        host to presence(host, 200L),
+                        speaker to presence(speaker, 300L, onstage = false),
+                    ),
+                roleGrantSec = 200L,
+            )
+        assertEquals(setOf(host), grid.onStage.map { it.pubkey }.toSet())
+        assertEquals(setOf(speaker), grid.audience.map { it.pubkey }.toSet())
+    }
+
     @Test
     fun explicitHostInPTagsIsNotDuplicated() {
         // The author already tagged themselves with role=host. The