feat: replace MLS Groups FAB with Create Group and show marmot messages in notifications

Replace the "MLS Groups" FAB button on MessagesScreen with a "Create
Group" action that navigates directly to the group creation screen
(Route.CreateMarmotGroup) instead of the group list page. This aligns
with the plan to merge all marmot groups into the Messages screen's
Known and New Requests tabs.

Add marmot group messages to the notification screen so they appear
alongside regular DMs. This includes:
- Including marmot group messages in NotificationFeedFilter.feed()
- Accepting marmot group notes in acceptableEvent() via inGatherers check
- Converting marmot group notes to MessageSetCard in CardFeedContentState
- Routing marmot group notification clicks to the group chat screen

https://claude.ai/code/session_012wbykgUYHNVdHVNbDDnMUt

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/navigation/routes/RouteMaker.kt

@@ -21,6 +21,7 @@
 package com.vitorpamplona.amethyst.ui.navigation.routes
 
 import com.vitorpamplona.amethyst.commons.model.emphChat.EphemeralChatChannel
+import com.vitorpamplona.amethyst.commons.model.marmotGroups.MarmotGroupChatroom
 import com.vitorpamplona.amethyst.commons.model.nip28PublicChats.PublicChatChannel
 import com.vitorpamplona.amethyst.commons.model.nip53LiveActivities.LiveActivitiesChannel
 import com.vitorpamplona.amethyst.model.Account
@@ -61,6 +62,12 @@ fun routeFor(
     note: Note,
     loggedIn: Account,
 ): Route? {
+    // Marmot group messages should navigate to the group chat
+    val marmotGroup = note.inGatherers?.firstNotNullOfOrNull { it as? MarmotGroupChatroom }
+    if (marmotGroup != null) {
+        return Route.MarmotGroupChat(marmotGroup.nostrGroupId)
+    }
+
     val noteEvent = note.event ?: return Route.EventRedirect(note.idHex)
 
     return routeFor(noteEvent, loggedIn)

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/chats/rooms/ChannelFabColumn.kt

@@ -106,7 +106,7 @@ fun ChannelFabColumn(nav: INav) {
 
                 FloatingActionButton(
                     onClick = {
-                        nav.nav(Route.MarmotGroupList)
+                        nav.nav(Route.CreateMarmotGroup)
                         isOpen = false
                     },
                     modifier = Size55Modifier,
@@ -114,7 +114,7 @@ fun ChannelFabColumn(nav: INav) {
                     containerColor = MaterialTheme.colorScheme.primary,
                 ) {
                     Text(
-                        text = "MLS\nGroups",
+                        text = stringRes(R.string.messages_create_group),
                         color = Color.White,
                         textAlign = TextAlign.Center,
                         fontSize = Font12SP,

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/notifications/CardFeedContentState.kt

@@ -24,6 +24,7 @@ import androidx.compose.runtime.Immutable
 import androidx.compose.runtime.MutableState
 import androidx.compose.runtime.Stable
 import androidx.compose.runtime.mutableStateOf
+import com.vitorpamplona.amethyst.commons.model.marmotGroups.MarmotGroupChatroom
 import com.vitorpamplona.amethyst.commons.ui.feeds.InvalidatableContent
 import com.vitorpamplona.amethyst.commons.ui.feeds.LoadedFeedState
 import com.vitorpamplona.amethyst.commons.ui.notifications.Card
@@ -306,7 +307,7 @@ class CardFeedContentState(
                         it.event !is GenericRepostEvent &&
                         it.event !is LnZapEvent
                 }.map {
-                    if (it.event is PrivateDmEvent || it.event is NIP17Group) {
+                    if (it.event is PrivateDmEvent || it.event is NIP17Group || it.isInMarmotGroup()) {
                         MessageSetCard(it)
                     } else if (it.event is BadgeAwardEvent) {
                         BadgeCard(it)
@@ -475,3 +476,5 @@ data class CombinedZap(
 
     fun idHex() = response.idHex
 }
+
+private fun Note.isInMarmotGroup(): Boolean = inGatherers?.any { it is MarmotGroupChatroom } == true

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/notifications/dal/NotificationFeedFilter.kt

@@ -34,6 +34,7 @@ import com.vitorpamplona.quartz.experimental.audio.track.AudioTrackEvent
 import com.vitorpamplona.quartz.experimental.forks.IForkableEvent
 import com.vitorpamplona.quartz.experimental.nipsOnNostr.NipTextEvent
 import com.vitorpamplona.quartz.experimental.zapPolls.ZapPollEvent
+import com.vitorpamplona.amethyst.commons.model.marmotGroups.MarmotGroupChatroom
 import com.vitorpamplona.quartz.nip01Core.core.AddressableEvent
 import com.vitorpamplona.quartz.nip01Core.core.HexKey
 import com.vitorpamplona.quartz.nip01Core.tags.people.isTaggedUser
@@ -151,7 +152,14 @@ class NotificationFeedFilter(
                     acceptableEvent(note, filterParams)
                 }
 
-        return sort(notifications)
+        // Include marmot group messages as notifications (like DMs)
+        val loggedInUserHex = account.userProfile().pubkeyHex
+        val marmotMessages =
+            account.marmotGroupList.rooms.mapFlatten { _, chatroom ->
+                chatroom.messages.filter { it.author?.pubkeyHex != loggedInUserHex }
+            }
+
+        return sort(notifications + marmotMessages)
     }
 
     override fun applyFilter(newItems: Set<Note>): Set<Note> = innerApplyFilter(newItems)
@@ -168,6 +176,12 @@ class NotificationFeedFilter(
     ): Boolean {
         val loggedInUserHex = account.userProfile().pubkeyHex
 
+        // Marmot group messages are always acceptable (user is a group member)
+        val isMarmotGroupMessage = it.inGatherers?.any { g -> g is MarmotGroupChatroom } == true
+        if (isMarmotGroupMessage) {
+            return it.author?.pubkeyHex != loggedInUserHex
+        }
+
         val noteEvent = it.event
         val notifAuthor =
             if (noteEvent is LnZapEvent) {

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

@@ -1090,6 +1090,7 @@
     <string name="new_feature_nip17_activate">Activate</string>
 
     <string name="messages_create_public_chat">Public</string>
+    <string name="messages_create_group">Group</string>
     <string name="messages_create_public_private_chat_description">New Public or Private Group</string>
     <string name="messages_relay_based">Relay</string>
     <string name="messages_new_message">Private</string>