chore(concord): remove now-unused facepile helpers

Delete ConcordAuthorFacepile and the ConcordChannel/RelayGroupChannel
recentAuthorHexes extensions, orphaned after the channel rows dropped the
recent-posters facepile.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017x22okBh6HbiCrJN3zf5xn

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/chats/publicChannels/concord/ConcordFacepile.kt

@@ -1,60 +0,0 @@
-/*
- * 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.chats.publicChannels.concord
-
-import androidx.compose.foundation.layout.Arrangement
-import androidx.compose.foundation.layout.Row
-import androidx.compose.runtime.Composable
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.unit.Dp
-import androidx.compose.ui.unit.dp
-import com.vitorpamplona.amethyst.ui.note.ClickableUserPicture
-import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
-import com.vitorpamplona.quartz.nip01Core.core.HexKey
-
-/**
- * A horizontal strip of the recent posters in a channel — the "who's here" cue that makes a busy
- * channel feel alive. Each poster is drawn with the app's standard profile avatar
- * ([ClickableUserPicture]), so it carries the same following badge (top-right) and trust-score tag
- * (bottom-centre) shown everywhere else a user appears, instead of a bare cropped image. Laid out
- * with a small gap rather than an overlapping stack so those badges stay readable; the newest poster
- * is leftmost. Renders nothing for an empty [authorHexes], so callers can drop it in unconditionally.
- */
-@Composable
-fun ConcordAuthorFacepile(
-    authorHexes: List<HexKey>,
-    accountViewModel: AccountViewModel,
-    modifier: Modifier = Modifier,
-    avatarSize: Dp = 24.dp,
-    maxShown: Int = 4,
-) {
-    if (authorHexes.isEmpty()) return
-    val shown = authorHexes.take(maxShown)
-    Row(modifier, horizontalArrangement = Arrangement.spacedBy(2.dp)) {
-        shown.forEach { hex ->
-            ClickableUserPicture(
-                baseUserHex = hex,
-                size = avatarSize,
-                accountViewModel = accountViewModel,
-            )
-        }
-    }
-}

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/chats/publicChannels/concord/ConcordUnread.kt

@@ -26,7 +26,6 @@ import com.vitorpamplona.amethyst.model.Account
 import com.vitorpamplona.amethyst.model.LocalCache
 import com.vitorpamplona.amethyst.model.Note
 import com.vitorpamplona.quartz.concord.cord03Channels.ConcordChannelId
-import com.vitorpamplona.quartz.nip01Core.core.HexKey
 import com.vitorpamplona.quartz.nip22Comments.CommentEvent
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.flow.Flow
@@ -135,22 +134,3 @@ private fun ConcordChannel.newMessagesSince(
     notes.count { _, note ->
         (note.createdAt() ?: 0L) > sinceSecs && isConcordTimelineMessage(note, account)
     }
-
-/**
- * The pubkeys of the [limit] most-recent distinct posters in this channel, newest first — the
- * facepile shown on a channel row. One O(notes) pass keeps each author's latest post time, so a
- * chatty author counts once (at their newest message) rather than crowding out quieter voices.
- */
-fun ConcordChannel.recentAuthorHexes(limit: Int): List<HexKey> {
-    val latestByAuthor = HashMap<HexKey, Long>()
-    for (note in notes.values()) {
-        val author = note.author?.pubkeyHex ?: continue
-        val at = note.createdAt() ?: continue
-        val prev = latestByAuthor[author]
-        if (prev == null || at > prev) latestByAuthor[author] = at
-    }
-    return latestByAuthor.entries
-        .sortedByDescending { it.value }
-        .take(limit)
-        .map { it.key }
-}

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/chats/publicChannels/relayGroup/RelayGroupUnread.kt

@@ -26,7 +26,6 @@ import com.vitorpamplona.amethyst.model.LocalCache
 import com.vitorpamplona.amethyst.model.Note
 import com.vitorpamplona.amethyst.ui.dal.sortedByDefaultFeedOrder
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.isMinichatReply
-import com.vitorpamplona.quartz.nip01Core.core.HexKey
 import com.vitorpamplona.quartz.nip01Core.relay.normalizer.NormalizedRelayUrl
 import com.vitorpamplona.quartz.nip01Core.relay.normalizer.RelayUrlNormalizer
 import com.vitorpamplona.quartz.nip29RelayGroups.GroupId
@@ -112,29 +111,6 @@ fun RelayGroupChannel.newestTimelineNote(account: Account): Note? =
         .sortedByDefaultFeedOrder()
         .firstOrNull()
 
-/**
- * The pubkeys of the [limit] most-recent distinct posters in this group, newest first — the facepile
- * shown on a channel row. One O(notes) pass keeps each author's latest post time, so a chatty author
- * counts once (at their newest message) rather than crowding out quieter voices.
- */
-fun RelayGroupChannel.recentAuthorHexes(
-    account: Account,
-    limit: Int,
-): List<HexKey> {
-    val latestByAuthor = HashMap<HexKey, Long>()
-    for (note in notes.values()) {
-        if (!isRelayGroupTimelineMessage(note, account)) continue
-        val author = note.author?.pubkeyHex ?: continue
-        val at = note.createdAt() ?: continue
-        val prev = latestByAuthor[author]
-        if (prev == null || at > prev) latestByAuthor[author] = at
-    }
-    return latestByAuthor.entries
-        .sortedByDescending { it.value }
-        .take(limit)
-        .map { it.key }
-}
-
 /** Whether this group's message store holds any acceptable timeline message created after [sinceSecs]. */
 private fun RelayGroupChannel.hasChatNewerThan(
     account: Account,