refactor(commonsUI): move the chat bubble group, and fix the round's audit findings

The chat bubble layout, its group-position shapes, jumbo emoji sizing, the
date/subject divisor and the scroll-to-newest effect move to commonsUI
commons/chats/ui. Desktop keeps its older ChatBubbleLayout fork for now; the
merge is the Desktop phase.

Audit follow-ups on the previous commit:
- PdfFetcher reads the disk cache from a provider on the IO dispatcher, so a
  cold-start PDF card no longer builds the app's lazy cache on main.
- The Buzz DM lists resolve TimeAgoLabels once per list, not per row.
- The iOS DateSkeletonFormatter rebuilds on a locale/time-zone change.
- ScreenLayoutTest pins the inclusive 600dp breakpoint.
- Stale KDoc links, a same-package import, and the baseline profile's
  stable-name entries for NowProvider and the moved theme functions.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UjQQN9CgWHVtNCSWqnKoqY

amethyst/src/main/generated/baselineProfiles/baseline-prof.txt

@@ -24768,17 +24768,17 @@ SPLcom/vitorpamplona/amethyst/ui/components/WindowUtilsKt;->getActivityOrNull(La
 Lcom/vitorpamplona/amethyst/commons/ui/navigation/topbars/ShorterTopAppBarKt;
 SPLcom/vitorpamplona/amethyst/commons/ui/navigation/topbars/ShorterTopAppBarKt;-><clinit>()V
 SPLcom/vitorpamplona/amethyst/commons/ui/navigation/topbars/ShorterTopAppBarKt;->getTopBarSize()F
-Lcom/vitorpamplona/amethyst/ui/note/elements/NowProviderKt;
-SPLcom/vitorpamplona/amethyst/ui/note/elements/NowProviderKt;-><clinit>()V
-SPLcom/vitorpamplona/amethyst/ui/note/elements/NowProviderKt;->NowProvider(Lkotlin/jvm/functions/Function2;Landroidx/compose/runtime/Composer;I)V
-Lcom/vitorpamplona/amethyst/ui/note/elements/NowProviderKt$$ExternalSyntheticLambda1;
-SPLcom/vitorpamplona/amethyst/ui/note/elements/NowProviderKt$$ExternalSyntheticLambda1;-><init>()V
-Lcom/vitorpamplona/amethyst/ui/note/elements/NowProviderKt$NowProvider$now$1$1;
-SPLcom/vitorpamplona/amethyst/ui/note/elements/NowProviderKt$NowProvider$now$1$1;-><init>(Lkotlin/coroutines/Continuation;)V
-SPLcom/vitorpamplona/amethyst/ui/note/elements/NowProviderKt$NowProvider$now$1$1;->create(Ljava/lang/Object;Lkotlin/coroutines/Continuation;)Lkotlin/coroutines/Continuation;
-SPLcom/vitorpamplona/amethyst/ui/note/elements/NowProviderKt$NowProvider$now$1$1;->invoke(Landroidx/compose/runtime/ProduceStateScope;Lkotlin/coroutines/Continuation;)Ljava/lang/Object;
-SPLcom/vitorpamplona/amethyst/ui/note/elements/NowProviderKt$NowProvider$now$1$1;->invoke(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
-SPLcom/vitorpamplona/amethyst/ui/note/elements/NowProviderKt$NowProvider$now$1$1;->invokeSuspend(Ljava/lang/Object;)Ljava/lang/Object;
+Lcom/vitorpamplona/amethyst/commons/ui/note/elements/NowProviderKt;
+SPLcom/vitorpamplona/amethyst/commons/ui/note/elements/NowProviderKt;-><clinit>()V
+SPLcom/vitorpamplona/amethyst/commons/ui/note/elements/NowProviderKt;->NowProvider(Lkotlin/jvm/functions/Function2;Landroidx/compose/runtime/Composer;I)V
+Lcom/vitorpamplona/amethyst/commons/ui/note/elements/NowProviderKt$$ExternalSyntheticLambda1;
+SPLcom/vitorpamplona/amethyst/commons/ui/note/elements/NowProviderKt$$ExternalSyntheticLambda1;-><init>()V
+Lcom/vitorpamplona/amethyst/commons/ui/note/elements/NowProviderKt$NowProvider$now$1$1;
+SPLcom/vitorpamplona/amethyst/commons/ui/note/elements/NowProviderKt$NowProvider$now$1$1;-><init>(Lkotlin/coroutines/Continuation;)V
+SPLcom/vitorpamplona/amethyst/commons/ui/note/elements/NowProviderKt$NowProvider$now$1$1;->create(Ljava/lang/Object;Lkotlin/coroutines/Continuation;)Lkotlin/coroutines/Continuation;
+SPLcom/vitorpamplona/amethyst/commons/ui/note/elements/NowProviderKt$NowProvider$now$1$1;->invoke(Landroidx/compose/runtime/ProduceStateScope;Lkotlin/coroutines/Continuation;)Ljava/lang/Object;
+SPLcom/vitorpamplona/amethyst/commons/ui/note/elements/NowProviderKt$NowProvider$now$1$1;->invoke(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
+SPLcom/vitorpamplona/amethyst/commons/ui/note/elements/NowProviderKt$NowProvider$now$1$1;->invokeSuspend(Ljava/lang/Object;)Ljava/lang/Object;
 Lcom/vitorpamplona/amethyst/ui/screen/AccountScreenKt;
 SPLcom/vitorpamplona/amethyst/ui/screen/AccountScreenKt;->AccountScreen$lambda$0(Landroidx/compose/runtime/State;)Lcom/vitorpamplona/amethyst/ui/screen/AccountState;
 SPLcom/vitorpamplona/amethyst/ui/screen/AccountScreenKt;->AccountScreen$lambda$2(Lcom/vitorpamplona/amethyst/ui/screen/AccountSessionManager;Lcom/vitorpamplona/amethyst/ui/screen/AccountState;Landroidx/compose/runtime/Composer;I)Lkotlin/Unit;
@@ -25632,6 +25632,7 @@ SPLcom/vitorpamplona/amethyst/commons/ui/theme/ShapeKt;->getSize40dp()F
 SPLcom/vitorpamplona/amethyst/commons/ui/theme/ShapeKt;->getSize50dp()F
 SPLcom/vitorpamplona/amethyst/commons/ui/theme/ShapeKt;->getSmallBorder()Landroidx/compose/foundation/shape/RoundedCornerShape;
 SPLcom/vitorpamplona/amethyst/commons/ui/theme/ShapeKt;->getSmallestBorder()Landroidx/compose/foundation/shape/RoundedCornerShape;
+Lcom/vitorpamplona/amethyst/commons/ui/theme/AmethystThemeKt;
 Lcom/vitorpamplona/amethyst/ui/theme/ThemeKt;
 Lcom/vitorpamplona/amethyst/commons/ui/theme/MarkdownStyleKt;
 Lcom/vitorpamplona/amethyst/commons/ui/theme/AmethystColorSchemeKt;
@@ -25648,13 +25649,13 @@ SPLcom/vitorpamplona/amethyst/ui/theme/ThemeKt;->AmethystTheme$lambda$9(Landroid
 SPLcom/vitorpamplona/amethyst/ui/theme/ThemeKt;->AmethystTheme(Lcom/vitorpamplona/amethyst/commons/model/ThemeType;Lcom/vitorpamplona/amethyst/commons/model/AccentColorType;Lcom/vitorpamplona/amethyst/commons/model/FontFamilyType;Lcom/vitorpamplona/amethyst/commons/model/FontSizeType;Lkotlin/jvm/functions/Function2;Landroidx/compose/runtime/Composer;II)V
 SPLcom/vitorpamplona/amethyst/ui/theme/ThemeKt;->AmethystTheme(Lkotlin/jvm/functions/Function2;Landroidx/compose/runtime/Composer;I)V
 SPLcom/vitorpamplona/amethyst/commons/ui/theme/AmethystColorSchemeKt;->accentContainer-DxMtmZc(JZ)J
-SPLcom/vitorpamplona/amethyst/ui/theme/ThemeKt;->accentPrimary(Lcom/vitorpamplona/amethyst/commons/model/AccentColorType;Z)J
-SPLcom/vitorpamplona/amethyst/ui/theme/ThemeKt;->accentSecondary(Lcom/vitorpamplona/amethyst/commons/model/AccentColorType;Z)J
-SPLcom/vitorpamplona/amethyst/ui/theme/ThemeKt;->darkColors(Lcom/vitorpamplona/amethyst/commons/model/AccentColorType;)Landroidx/compose/material3/ColorScheme;
+SPLcom/vitorpamplona/amethyst/commons/ui/theme/AmethystThemeKt;->accentPrimary(Lcom/vitorpamplona/amethyst/commons/model/AccentColorType;Z)J
+SPLcom/vitorpamplona/amethyst/commons/ui/theme/AmethystThemeKt;->accentSecondary(Lcom/vitorpamplona/amethyst/commons/model/AccentColorType;Z)J
+SPLcom/vitorpamplona/amethyst/commons/ui/theme/AmethystThemeKt;->amethystDarkColors(Lcom/vitorpamplona/amethyst/commons/model/AccentColorType;)Landroidx/compose/material3/ColorScheme;
 SPLcom/vitorpamplona/amethyst/commons/ui/theme/AmethystColorSchemeKt;->getPlaceholderText(Landroidx/compose/material3/ColorScheme;)J
 SPLcom/vitorpamplona/amethyst/commons/ui/theme/AmethystColorSchemeKt;->getTransparentBackground(Landroidx/compose/material3/ColorScheme;)J
 SPLcom/vitorpamplona/amethyst/commons/ui/theme/AmethystColorSchemeKt;->isLight(Landroidx/compose/material3/ColorScheme;)Z
-SPLcom/vitorpamplona/amethyst/ui/theme/ThemeKt;->lightColors(Lcom/vitorpamplona/amethyst/commons/model/AccentColorType;)Landroidx/compose/material3/ColorScheme;
+SPLcom/vitorpamplona/amethyst/commons/ui/theme/AmethystThemeKt;->amethystLightColors(Lcom/vitorpamplona/amethyst/commons/model/AccentColorType;)Landroidx/compose/material3/ColorScheme;
 SPLcom/vitorpamplona/amethyst/commons/ui/theme/AmethystColorSchemeKt;->onAccent-8_81llA(J)J
 SPLcom/vitorpamplona/amethyst/commons/ui/theme/AmethystColorSchemeKt;->onAccentContainer-DxMtmZc(JZ)J
 Lcom/vitorpamplona/amethyst/ui/theme/ThemeKt$$ExternalSyntheticLambda0;
@@ -25685,7 +25686,7 @@ SPLcom/vitorpamplona/amethyst/commons/ui/theme/TypeKt;->getDefaultParagraphSpaci
 SPLcom/vitorpamplona/amethyst/commons/ui/theme/TypeKt;->getFont14SP()J
 SPLcom/vitorpamplona/amethyst/commons/ui/theme/TypeKt;->getFont17SP()J
 SPLcom/vitorpamplona/amethyst/commons/ui/theme/TypeKt;->getTypography()Landroidx/compose/material3/Typography;
-SPLcom/vitorpamplona/amethyst/ui/theme/ThemeKt;->toFontFamily(Lcom/vitorpamplona/amethyst/commons/model/FontFamilyType;)Landroidx/compose/ui/text/font/FontFamily;
+SPLcom/vitorpamplona/amethyst/commons/ui/theme/AmethystThemeKt;->toFontFamily(Lcom/vitorpamplona/amethyst/commons/model/FontFamilyType;)Landroidx/compose/ui/text/font/FontFamily;
 SPLcom/vitorpamplona/amethyst/commons/ui/theme/TypeKt;->withFontFamily(Landroidx/compose/material3/Typography;Landroidx/compose/ui/text/font/FontFamily;)Landroidx/compose/material3/Typography;
 Lcom/vitorpamplona/amethyst/commons/ui/theme/TypeKt$$ExternalSyntheticLambda0;
 SPLcom/vitorpamplona/amethyst/commons/ui/theme/TypeKt$$ExternalSyntheticLambda0;-><init>()V

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/components/pdf/PdfPreviewCard.kt

@@ -158,7 +158,7 @@ private fun LoadedPdfPreviewCard(
         value =
             try {
                 PdfFetcher
-                    .fetchSnapshot(content.url, Amethyst.instance.diskCache) { url ->
+                    .fetchSnapshot(content.url, { Amethyst.instance.diskCache }) { url ->
                         accountViewModel.httpClientBuilder.okHttpClientForPreview(url)
                     }.use { snapshot ->
                         withContext(Dispatchers.IO) {

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/components/pdf/PdfViewerDialog.kt

@@ -196,7 +196,7 @@ private fun PdfViewerContent(
             try {
                 withContext(Dispatchers.IO) {
                     val snapshot =
-                        PdfFetcher.fetchSnapshot(content.url, Amethyst.instance.diskCache) { url ->
+                        PdfFetcher.fetchSnapshot(content.url, { Amethyst.instance.diskCache }) { url ->
                             accountViewModel.httpClientBuilder.okHttpClientForPreview(url)
                         }
                     try {

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

@@ -273,7 +273,7 @@ private fun PermanentDrawerShell(
 
 /**
  * Hosts the navigation content. Screen width capping happens per NavHost destination
- * ([com.vitorpamplona.amethyst.ui.layouts.CappedScreenContent] via the NavigationEffects
+ * ([com.vitorpamplona.amethyst.commons.ui.layouts.CappedScreenContent] via the NavigationEffects
  * builders), so this pane just claims the leftover row width.
  */
 @Composable

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/buzz/BuzzDmListScreen.kt

@@ -85,6 +85,7 @@ import com.vitorpamplona.amethyst.commons.resources.cancel
 import com.vitorpamplona.amethyst.commons.resources.remove_from_messages
 import com.vitorpamplona.amethyst.commons.ui.navigation.navs.INav
 import com.vitorpamplona.amethyst.commons.ui.navigation.topbars.TopBarWithBackButton
+import com.vitorpamplona.amethyst.commons.ui.note.TimeAgoLabels
 import com.vitorpamplona.amethyst.commons.ui.note.rememberTimeAgoLabels
 import com.vitorpamplona.amethyst.commons.ui.note.timeAgoShort
 import com.vitorpamplona.amethyst.commons.ui.pluralStringRes
@@ -127,6 +128,8 @@ fun BuzzDmListScreen(
     // Hidden conversations stay collapsed behind a header — they are off Messages by the user's own
     // choice, so they must not compete with the live inbox; they only need to be *reachable* again.
     var showHidden by remember { mutableStateOf(false) }
+    // Resolved once for the list, not per row.
+    val timeLabels = rememberTimeAgoLabels()
 
     Scaffold(
         topBar = { TopBarWithBackButton(stringRes(Res.string.buzz_dm_title), nav) },
@@ -149,7 +152,7 @@ fun BuzzDmListScreen(
                 verticalArrangement = Arrangement.spacedBy(10.dp),
             ) {
                 items(rows, key = { it.channelId }) { row ->
-                    DmRowCard(row, isHidden = false, viewModel = viewModel, accountViewModel = accountViewModel, nav = nav)
+                    DmRowCard(row, isHidden = false, viewModel = viewModel, timeLabels = timeLabels, accountViewModel = accountViewModel, nav = nav)
                 }
                 if (hiddenRows.isNotEmpty()) {
                     item(key = "hidden-header") {
@@ -161,7 +164,7 @@ fun BuzzDmListScreen(
                     }
                     if (showHidden) {
                         items(hiddenRows, key = { "hidden-${it.channelId}" }) { row ->
-                            DmRowCard(row, isHidden = true, viewModel = viewModel, accountViewModel = accountViewModel, nav = nav)
+                            DmRowCard(row, isHidden = true, viewModel = viewModel, timeLabels = timeLabels, accountViewModel = accountViewModel, nav = nav)
                         }
                     }
                 }
@@ -211,6 +214,7 @@ private fun DmRowCard(
     row: BuzzDmListViewModel.DmRow,
     isHidden: Boolean,
     viewModel: BuzzDmListViewModel,
+    timeLabels: TimeAgoLabels,
     accountViewModel: AccountViewModel,
     nav: INav,
 ) {
@@ -256,7 +260,7 @@ private fun DmRowCard(
             }
             Spacer(Modifier.width(8.dp))
             Text(
-                text = timeAgoShort(row.lastActivity, rememberTimeAgoLabels()),
+                text = timeAgoShort(row.lastActivity, timeLabels),
                 style = MaterialTheme.typography.labelMedium,
                 color = MaterialTheme.colorScheme.onSurfaceVariant,
             )

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/chats/cordnGroup/CordnGroupChatScreen.kt

@@ -69,6 +69,7 @@ import androidx.compose.ui.unit.dp
 import androidx.core.content.ContextCompat
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import com.vitorpamplona.amethyst.Amethyst
+import com.vitorpamplona.amethyst.commons.chats.ui.AutoScrollToNewest
 import com.vitorpamplona.amethyst.commons.cordn.CordnGroupManager
 import com.vitorpamplona.amethyst.commons.icons.symbols.Icon
 import com.vitorpamplona.amethyst.commons.icons.symbols.MaterialSymbols
@@ -121,7 +122,6 @@ import com.vitorpamplona.amethyst.ui.note.UserPicture
 import com.vitorpamplona.amethyst.ui.note.types.RenderAudioWaveformPlayer
 import com.vitorpamplona.amethyst.ui.pluralStringRes
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
-import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.feed.AutoScrollToNewest
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.feed.types.observeUserNameByHex
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.utils.ChatFileUploadDialog
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.utils.ChatFileUploadState

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/chats/cordnGroup/CordnMessageRow.kt

@@ -55,8 +55,13 @@ import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
+import com.vitorpamplona.amethyst.commons.chats.ui.CHAT_GROUP_WINDOW_SECONDS
+import com.vitorpamplona.amethyst.commons.chats.ui.ChatBubbleLayout
 import com.vitorpamplona.amethyst.commons.chats.ui.ChatDivisor
+import com.vitorpamplona.amethyst.commons.chats.ui.ChatGroupPosition
 import com.vitorpamplona.amethyst.commons.chats.ui.UserDisplayNameLayout
+import com.vitorpamplona.amethyst.commons.chats.ui.jumboEmojiCount
+import com.vitorpamplona.amethyst.commons.chats.ui.jumboEmojiFontSize
 import com.vitorpamplona.amethyst.commons.cordn.CordnMentions
 import com.vitorpamplona.amethyst.commons.icons.symbols.Icon
 import com.vitorpamplona.amethyst.commons.icons.symbols.MaterialSymbols
@@ -109,11 +114,6 @@ import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.feed.ReactionChipView
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.feed.SectionDivider
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.feed.TileRow
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.feed.authorNameColorFor
-import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.feed.jumboEmojiCount
-import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.feed.jumboEmojiFontSize
-import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.feed.layouts.CHAT_GROUP_WINDOW_SECONDS
-import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.feed.layouts.ChatBubbleLayout
-import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.feed.layouts.ChatGroupPosition
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.feed.types.observeUserNameByHex
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.settings.cordn.coordinatorDisplayName
 import com.vitorpamplona.amethyst.ui.stringRes

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/chats/feed/ChatFeedView.kt

@@ -36,6 +36,9 @@ import androidx.compose.runtime.remember
 import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.ui.Modifier
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
+import com.vitorpamplona.amethyst.commons.chats.ui.AutoScrollToNewest
+import com.vitorpamplona.amethyst.commons.chats.ui.NewDateOrSubjectDivisor
+import com.vitorpamplona.amethyst.commons.chats.ui.watchChatGroupPosition
 import com.vitorpamplona.amethyst.commons.feeds.FeedContentState
 import com.vitorpamplona.amethyst.commons.feeds.FeedState
 import com.vitorpamplona.amethyst.commons.model.Note
@@ -48,7 +51,6 @@ import com.vitorpamplona.amethyst.commons.ui.theme.FeedPadding
 import com.vitorpamplona.amethyst.ui.note.creators.draftTags.DraftTagState
 import com.vitorpamplona.amethyst.ui.screen.SaveableFeedState
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
-import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.feed.layouts.watchChatGroupPosition
 import com.vitorpamplona.quartz.nip37Drafts.DraftWrapEvent
 import kotlinx.coroutines.launch
 

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/chats/feed/ChatMessageCompose.kt

@@ -45,6 +45,9 @@ import androidx.compose.ui.Alignment.Companion.CenterStart
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.unit.dp
+import com.vitorpamplona.amethyst.commons.chats.ui.ChatBubbleLayout
+import com.vitorpamplona.amethyst.commons.chats.ui.ChatGroupPosition
+import com.vitorpamplona.amethyst.commons.chats.ui.jumboEmojiCount
 import com.vitorpamplona.amethyst.commons.model.Note
 import com.vitorpamplona.amethyst.commons.model.latestBuzzEdit
 import com.vitorpamplona.amethyst.commons.model.latestConcordEdit
@@ -60,8 +63,6 @@ import com.vitorpamplona.amethyst.ui.note.WatchBlockAndReport
 import com.vitorpamplona.amethyst.ui.note.WatchNoteEvent
 import com.vitorpamplona.amethyst.ui.note.creators.zapsplits.DisplayZapSplits
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
-import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.feed.layouts.ChatBubbleLayout
-import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.feed.layouts.ChatGroupPosition
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.feed.types.RenderBuzzActivityRow
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.feed.types.RenderBuzzDiff
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.feed.types.RenderBuzzEditedNote

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/chats/feed/types/RenderRegularTextNote.kt

@@ -26,6 +26,8 @@ import androidx.compose.runtime.MutableState
 import androidx.compose.runtime.remember
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
+import com.vitorpamplona.amethyst.commons.chats.ui.jumboEmojiCount
+import com.vitorpamplona.amethyst.commons.chats.ui.jumboEmojiFontSize
 import com.vitorpamplona.amethyst.commons.model.EmptyTagList
 import com.vitorpamplona.amethyst.commons.model.Note
 import com.vitorpamplona.amethyst.commons.model.toImmutableListOfLists
@@ -40,8 +42,6 @@ import com.vitorpamplona.amethyst.ui.note.types.RenderAudioFromIMeta
 import com.vitorpamplona.amethyst.ui.note.types.appendMissingImetaUrls
 import com.vitorpamplona.amethyst.ui.note.types.getAudioMetaWithWaveform
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
-import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.feed.jumboEmojiCount
-import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.feed.jumboEmojiFontSize
 
 @Composable
 fun RenderRegularTextNote(

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

@@ -99,6 +99,7 @@ import com.vitorpamplona.amethyst.commons.resources.relay_tor_clearnet_title
 import com.vitorpamplona.amethyst.commons.ui.components.RobohashFallbackAsyncImage
 import com.vitorpamplona.amethyst.commons.ui.navigation.navs.INav
 import com.vitorpamplona.amethyst.commons.ui.navigation.topbars.TopBarExtensibleWithBackButton
+import com.vitorpamplona.amethyst.commons.ui.note.TimeAgoLabels
 import com.vitorpamplona.amethyst.commons.ui.note.rememberTimeAgoLabels
 import com.vitorpamplona.amethyst.commons.ui.note.timeAgoShort
 import com.vitorpamplona.amethyst.commons.ui.pluralStringRes
@@ -263,6 +264,8 @@ fun RelayGroupChannelListScreen(
     // as the workspace overflow menu (Add people / Invite), whose own doc notes "any member sees them,
     // the relay only serves the owner/admin ones."
     val myPubkey = accountViewModel.account.signer.pubKey
+    // Resolved once for the list, not per DM row.
+    val timeLabels = rememberTimeAgoLabels()
 
     val buzzVm: BuzzRelayImportViewModel = viewModel(key = "BuzzImport-${relay.url}")
     LaunchedEffect(relay, isBuzz) { if (isBuzz) buzzVm.bind(accountViewModel.account, relay.url) }
@@ -644,6 +647,7 @@ fun RelayGroupChannelListScreen(
                             BuzzDmInlineRow(
                                 row = row,
                                 myPubkey = myPubkey,
+                                timeLabels = timeLabels,
                                 isHidden = false,
                                 accountViewModel = accountViewModel,
                                 nav = nav,
@@ -675,6 +679,7 @@ fun RelayGroupChannelListScreen(
                                 BuzzDmInlineRow(
                                     row = row,
                                     myPubkey = myPubkey,
+                                    timeLabels = timeLabels,
                                     isHidden = true,
                                     accountViewModel = accountViewModel,
                                     nav = nav,
@@ -828,6 +833,7 @@ private fun SectionAddButton(
 private fun BuzzDmInlineRow(
     row: BuzzDmListViewModel.DmRow,
     myPubkey: HexKey,
+    timeLabels: TimeAgoLabels,
     isHidden: Boolean,
     accountViewModel: AccountViewModel,
     nav: INav,
@@ -885,7 +891,7 @@ private fun BuzzDmInlineRow(
         }
         if (row.lastActivity > 0) {
             Text(
-                text = timeAgoShort(row.lastActivity, rememberTimeAgoLabels()),
+                text = timeAgoShort(row.lastActivity, timeLabels),
                 style = MaterialTheme.typography.bodySmall,
                 color = MaterialTheme.colorScheme.onSurfaceVariant,
             )

amethyst/src/test/java/com/vitorpamplona/amethyst/cordn/CordnMessageGroupingTest.kt

@@ -20,9 +20,9 @@
  */
 package com.vitorpamplona.amethyst.cordn
 
+import com.vitorpamplona.amethyst.commons.chats.ui.ChatGroupPosition
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.cordnGroup.cordnGroupPositionFor
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.cordnGroup.sameDayAs
-import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.feed.layouts.ChatGroupPosition
 import com.vitorpamplona.quartz.cordn.spec02Envelopes.CordnDeliveredMessage
 import com.vitorpamplona.quartz.cordn.spec02Envelopes.CordnEnvelope
 import com.vitorpamplona.quartz.nip01Core.core.HexKey

amethyst/src/test/java/com/vitorpamplona/amethyst/ui/layouts/ScreenLayoutTest.kt

@@ -88,6 +88,10 @@ class ScreenLayoutTest {
     @Test
     fun compactWidthKeepsTheBottomBar() = assertStyle(NavigationStyle.BOTTOM_BAR, 599, 900)
 
+    // The Medium breakpoint is inclusive: exactly 600dp is no longer Compact.
+    @Test
+    fun exactlyAtTheMediumBreakpointRails() = assertStyle(NavigationStyle.NAV_RAIL, 600, 900)
+
     // ---- Notification panel ----
 
     @Test

commons/plans/2026-08-30-commons-migration-sweep.md

@@ -1501,3 +1501,26 @@ A transitive-blocker sweep of the 1,385 files under `amethyst/…/ui/`, after th
 - **Two corrections to the MOVE-AFTER table above:**
   - `INav`/`Route` are no longer blockers: every ui file imports the commons ones.
   - `ui/note/types` is 111 files, not ~89, and "AVM threading" understates it: the hubs matter more than the parameter.
+
+### Follow-up in the same round: the chat bubble group, and the audit
+
+- **Moved to `commonsUI/…/commons/chats/ui`**, beside `ChatDivisor` and
+  `UserDisplayNameLayout`: `ChatBubbleLayout`, `ChatGroupPosition`, `JumboEmoji`,
+  `NewDateOrSubjectDivisor` and `AutoScrollToNewest`. `AutoScrollToNewest` and
+  `CHAT_GROUP_WINDOW_SECONDS` went from `internal` to public so the app can reach them.
+  Desktop's `ui/chats/ChatBubbleLayout.kt` is an older fork of this one (no group
+  position, jumbo emoji, swipe-to-reply or reaction row). Replacing it is the Desktop
+  phase.
+- **Audit follow-ups:**
+  - `PdfFetcher` takes the disk cache as a provider, read on the IO dispatcher, so a PDF
+    card composing on a cold start doesn't build the app's lazy cache on the main thread.
+  - The two DM lists resolve `TimeAgoLabels` once per list instead of once per row.
+  - The iOS `DateSkeletonFormatter` rebuilds on a locale or time-zone change, like the
+    other actuals.
+  - `ScreenLayoutTest` pins the inclusive 600dp boundary.
+  - Two stale KDoc links and a same-package import are fixed.
+  - The generated baseline profile has its stable-name entries repointed:
+    `NowProviderKt`, and the five theme functions now in `AmethystThemeKt`. Its R8
+    lambda entries were already stale before this round (it still lists
+    `MarkDownStyleOnDark` under `ThemeKt`), so **regenerate the profile** after these
+    moves.

commonsUI/src/commonMain/kotlin/com/vitorpamplona/amethyst/commons/chats/ui/AutoScrollToNewest.kt

@@ -18,7 +18,7 @@
  * 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.feed
+package com.vitorpamplona.amethyst.commons.chats.ui
 
 import androidx.compose.foundation.lazy.LazyListState
 import androidx.compose.runtime.Composable
@@ -46,7 +46,7 @@ import androidx.compose.runtime.LaunchedEffect
  * message they just wrote somewhere off-screen below.
  */
 @Composable
-internal fun AutoScrollToNewest(
+fun AutoScrollToNewest(
     listState: LazyListState,
     newest: Any?,
     mine: Boolean = false,

commonsUI/src/commonMain/kotlin/com/vitorpamplona/amethyst/commons/chats/ui/ChatBubbleLayout.kt

@@ -18,7 +18,7 @@
  * 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.feed.layouts
+package com.vitorpamplona.amethyst.commons.chats.ui
 
 import androidx.compose.animation.animateColorAsState
 import androidx.compose.animation.core.animate
@@ -73,7 +73,6 @@ import androidx.compose.ui.platform.LocalHapticFeedback
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
-import com.vitorpamplona.amethyst.commons.chats.ui.UserDisplayNameLayout
 import com.vitorpamplona.amethyst.commons.icons.symbols.Icon
 import com.vitorpamplona.amethyst.commons.icons.symbols.MaterialSymbols
 import com.vitorpamplona.amethyst.commons.ui.note.CommentIcon

commonsUI/src/commonMain/kotlin/com/vitorpamplona/amethyst/commons/chats/ui/ChatGroupPosition.kt

@@ -18,7 +18,7 @@
  * 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.feed.layouts
+package com.vitorpamplona.amethyst.commons.chats.ui
 
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.runtime.Composable
@@ -88,7 +88,7 @@ fun chatBubbleShapeFor(
     }
 
 /** Messages more than this far apart never group, even from the same author. */
-internal const val CHAT_GROUP_WINDOW_SECONDS = 10 * 60L
+const val CHAT_GROUP_WINDOW_SECONDS = 10 * 60L
 
 /**
  * Event kinds that don't render as regular bubbles (zaps, raids, clips) or that

commonsUI/src/commonMain/kotlin/com/vitorpamplona/amethyst/commons/chats/ui/JumboEmoji.kt

@@ -18,7 +18,7 @@
  * 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.feed
+package com.vitorpamplona.amethyst.commons.chats.ui
 
 import androidx.compose.ui.unit.TextUnit
 import androidx.compose.ui.unit.sp

commonsUI/src/commonMain/kotlin/com/vitorpamplona/amethyst/commons/chats/ui/NewDateOrSubjectDivisor.kt

@@ -18,11 +18,10 @@
  * 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.feed
+package com.vitorpamplona.amethyst.commons.chats.ui
 
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.remember
-import com.vitorpamplona.amethyst.commons.chats.ui.ChatDivisor
 import com.vitorpamplona.amethyst.commons.model.Note
 import com.vitorpamplona.amethyst.commons.resources.Res
 import com.vitorpamplona.amethyst.commons.resources.never

commonsUI/src/commonMain/kotlin/com/vitorpamplona/amethyst/commons/ui/components/FileAttachmentCard.kt

@@ -91,7 +91,7 @@ fun FileAttachmentCard(
 /**
  * The icon + title + subtitle row shared by every card that stands in for a file it can't
  * render inline: this one and the PDF placeholder/skeleton in
- * [com.vitorpamplona.amethyst.ui.components.pdf.PdfPreviewCard].
+ * the Android app's `PdfPreviewCard`.
  */
 @Composable
 fun FileAttachmentRow(

commonsUI/src/commonMain/kotlin/com/vitorpamplona/amethyst/commons/ui/note/elements/TimeAgo.kt

@@ -36,7 +36,6 @@ import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.TextUnit
 import com.vitorpamplona.amethyst.commons.model.Note
-import com.vitorpamplona.amethyst.commons.ui.note.elements.LocalNowSeconds
 import com.vitorpamplona.amethyst.commons.ui.note.rememberTimeAgoLabels
 import com.vitorpamplona.amethyst.commons.ui.note.rememberTimeOfDayFormatter
 import com.vitorpamplona.amethyst.commons.ui.note.timeAbsoluteWith

commonsUI/src/iosMain/kotlin/com/vitorpamplona/amethyst/commons/ui/note/PlatformDateFormat.ios.kt

@@ -30,22 +30,41 @@ import platform.Foundation.NSDateFormatter
 import platform.Foundation.NSDateFormatterNoStyle
 import platform.Foundation.NSDateFormatterShortStyle
 import platform.Foundation.NSLocale
+import platform.Foundation.NSTimeZone
 import platform.Foundation.currentLocale
 import platform.Foundation.dateWithTimeIntervalSince1970
+import platform.Foundation.defaultTimeZone
+import platform.Foundation.localeIdentifier
+import kotlin.concurrent.Volatile
 
 private fun dateOf(epochMillis: Long) = NSDate.dateWithTimeIntervalSince1970(epochMillis / 1000.0)
 
-/** NSDateFormatter is thread-safe for formatting on iOS 7+; the template picks the locale's order. */
+/**
+ * NSDateFormatter is thread-safe for formatting on iOS 7+; the template picks the locale's order.
+ * Rebuilt when the current locale or time zone changes, like the other actuals.
+ */
 actual class DateSkeletonFormatter actual constructor(
-    skeleton: String,
+    private val skeleton: String,
 ) {
-    private val formatter =
-        NSDateFormatter().apply {
-            locale = NSLocale.currentLocale
-            setLocalizedDateFormatFromTemplate(skeleton)
-        }
+    private class Cached(
+        val key: String,
+        val formatter: NSDateFormatter,
+    )
 
-    actual fun format(epochMillis: Long): String = formatter.stringFromDate(dateOf(epochMillis))
+    @Volatile private var cached: Cached? = null
+
+    actual fun format(epochMillis: Long): String {
+        val locale = NSLocale.currentLocale
+        val key = locale.localeIdentifier + "|" + NSTimeZone.defaultTimeZone.name
+        val formatter =
+            cached?.takeIf { it.key == key }?.formatter
+                ?: NSDateFormatter()
+                    .apply {
+                        this.locale = locale
+                        setLocalizedDateFormatFromTemplate(skeleton)
+                    }.also { cached = Cached(key, it) }
+        return formatter.stringFromDate(dateOf(epochMillis))
+    }
 }
 
 actual fun calendarYearAndDay(epochMillis: Long): Int {

commonsUI/src/jvmAndroid/kotlin/com/vitorpamplona/amethyst/commons/service/pdf/PdfFetcher.kt

@@ -34,15 +34,17 @@ object PdfFetcher {
      * responsible for closing the returned snapshot; while it's open the cache entry cannot be
      * evicted, so the underlying file stays valid for `PdfRenderer`.
      *
-     * Pass the app's Coil [diskCache] so PDFs share the same LRU eviction and disk budget as
-     * images.
+     * Pass the app's Coil disk cache so PDFs share the same LRU eviction and disk budget as
+     * images. It is a provider, read on the IO dispatcher: the app builds its cache lazily
+     * (statvfs, directory setup), and a card composing on a cold start must not do that on main.
      */
     suspend fun fetchSnapshot(
         url: String,
-        diskCache: DiskCache,
+        diskCache: () -> DiskCache,
         okHttpClient: (String) -> OkHttpClient,
     ): DiskCache.Snapshot =
         withContext(Dispatchers.IO) {
+            val diskCache = diskCache()
             // Covers the cache-hit fast path too, not just the download below it. openSnapshot()
             // contends on the global DiskLruCache lock, which Coil's cleanup pass holds across a
             // burst of unlink syscalls (see DeferredDeleteFileSystem) — calling it from a caller