feat: jump-to-parent icon on replies in Full UI mode

Adds a small chevron-up button next to the timestamp on each reply.
Tapping it navigates to the note this reply is replying to so users
can follow conversation chains in dense threads. Hidden in Simplified
and Performance UI modes.

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/note/NoteCompose.kt

@@ -62,11 +62,13 @@ import com.vitorpamplona.amethyst.commons.icons.symbols.Icon
 import com.vitorpamplona.amethyst.commons.icons.symbols.MaterialSymbols
 import com.vitorpamplona.amethyst.commons.model.nip28PublicChats.PublicChatChannel
 import com.vitorpamplona.amethyst.model.AddressableNote
+import com.vitorpamplona.amethyst.model.LocalCache
 import com.vitorpamplona.amethyst.model.Note
 import com.vitorpamplona.amethyst.service.relayClient.reqCommand.channel.observeChannelPicture
 import com.vitorpamplona.amethyst.service.relayClient.reqCommand.event.observeCommunityApprovalNeedStatus
 import com.vitorpamplona.amethyst.service.relayClient.reqCommand.event.observeNoteEdits
 import com.vitorpamplona.amethyst.service.relayClient.reqCommand.event.observeNoteEvent
+import com.vitorpamplona.amethyst.ui.components.ClickableBox
 import com.vitorpamplona.amethyst.ui.components.GenericLoadable
 import com.vitorpamplona.amethyst.ui.components.RobohashFallbackAsyncImage
 import com.vitorpamplona.amethyst.ui.layouts.GenericRepostLayout
@@ -210,6 +212,7 @@ import com.vitorpamplona.quartz.experimental.nipsOnNostr.NipTextEvent
 import com.vitorpamplona.quartz.experimental.zapPolls.ZapPollEvent
 import com.vitorpamplona.quartz.nip01Core.tags.geohash.geoHashOrScope
 import com.vitorpamplona.quartz.nip04Dm.messages.PrivateDmEvent
+import com.vitorpamplona.quartz.nip10Notes.BaseThreadedEvent
 import com.vitorpamplona.quartz.nip10Notes.TextNoteEvent
 import com.vitorpamplona.quartz.nip13Pow.strongPoWOrNull
 import com.vitorpamplona.quartz.nip17Dm.files.ChatMessageEncryptedFileHeaderEvent
@@ -1672,6 +1675,8 @@ fun FirstUserInfoRow(
 
         Expiration(baseNote)
 
+        JumpToParentReplyButton(baseNote, accountViewModel, nav)
+
         TimeAgo(baseNote)
 
         if (moreOptions == null) {
@@ -1692,6 +1697,48 @@ fun PinnedMark() {
     )
 }
 
+@Composable
+fun JumpToParentReplyButton(
+    baseNote: Note,
+    accountViewModel: AccountViewModel,
+    nav: INav,
+) {
+    if (!accountViewModel.settings.isCompleteUIMode()) return
+    if (baseNote.event !is BaseThreadedEvent) return
+
+    val parentNote =
+        remember(baseNote) {
+            val noteEvent = baseNote.event as? BaseThreadedEvent ?: return@remember null
+            val replyingTo = noteEvent.replyingToAddressOrEvent()
+            val resolved =
+                if (replyingTo != null) {
+                    val newNote = accountViewModel.getNoteIfExists(replyingTo)
+                    if (newNote != null && LocalCache.getAnyChannel(newNote) == null && newNote.event?.kind != CommunityDefinitionEvent.KIND) {
+                        newNote
+                    } else {
+                        baseNote.replyTo?.lastOrNull { it.event?.kind != CommunityDefinitionEvent.KIND }
+                    }
+                } else {
+                    baseNote.replyTo?.lastOrNull { it.event?.kind != CommunityDefinitionEvent.KIND }
+                }
+            resolved?.takeIf { LocalCache.getAnyChannel(it) == null }
+        } ?: return
+
+    ClickableBox(
+        modifier = Modifier.padding(start = 5.dp).size(20.dp),
+        onClick = {
+            nav.nav { routeFor(parentNote, accountViewModel.account) }
+        },
+    ) {
+        Icon(
+            symbol = MaterialSymbols.KeyboardArrowUp,
+            contentDescription = stringRes(R.string.jump_to_parent_reply),
+            modifier = Modifier.size(18.dp),
+            tint = MaterialTheme.colorScheme.placeholderText,
+        )
+    }
+}
+
 @Composable
 fun Expiration(note: Note) {
     val event = note.event

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

@@ -1724,6 +1724,7 @@
     <string name="close_all_reactions_to_this_post">Close all reactions to this post</string>
 
     <string name="reply_description">Reply</string>
+    <string name="jump_to_parent_reply">Jump to the note this reply is replying to</string>
     <string name="boost_or_quote_description">Boost Or Quote</string>
     <string name="like_description">Like</string>
     <string name="zap_description">Zap</string>