feat: show "Replying to" label in quoted notes

Follow-up to #1723. When a quoted note is itself a reply, display a
compact "Replying to [username]" label above the content instead of
showing nothing. Uses the event's p-tags to resolve reply targets
directly, matching the Damus-style display.

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/components/RichTextViewer.kt

@@ -595,6 +595,7 @@ fun DisplayFullNote(
         baseNote = note,
         modifier = MaterialTheme.colorScheme.innerPostModifier,
         isQuotedNote = true,
+        unPackReply = false,
         quotesLeft = quotesLeft - 1,
         parentBackgroundColor = backgroundColor,
         accountViewModel = accountViewModel,
@@ -867,6 +868,7 @@ private fun DisplayNoteFromTag(
             baseNote = baseNote,
             modifier = MaterialTheme.colorScheme.innerPostModifier,
             isQuotedNote = true,
+            unPackReply = false,
             quotesLeft = quotesLeft - 1,
             parentBackgroundColor = backgroundColor,
             accountViewModel = accountViewModel,

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

@@ -116,6 +116,31 @@ fun ReplyInformationChannel(
     }
 }
 
+@OptIn(ExperimentalLayoutApi::class)
+@Composable
+fun ReplyToLabel(
+    replyingDirectlyTo: Note,
+    accountViewModel: AccountViewModel,
+    nav: INav,
+) {
+    val user = replyingDirectlyTo.author ?: return
+
+    FlowRow {
+        Text(
+            stringRes(id = R.string.replying_to),
+            fontSize = 13.sp,
+            color = MaterialTheme.colorScheme.placeholderText,
+        )
+
+        ReplyInfoMention(
+            user = user,
+            prefix = "",
+            accountViewModel = accountViewModel,
+            onUserTagClick = { nav.nav(routeFor(it)) },
+        )
+    }
+}
+
 @Composable
 private fun ReplyInfoMention(
     user: User,

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/note/types/Text.kt

@@ -42,6 +42,7 @@ import com.vitorpamplona.amethyst.ui.components.SensitivityWarning
 import com.vitorpamplona.amethyst.ui.components.TranslatableRichTextViewer
 import com.vitorpamplona.amethyst.ui.navigation.navs.INav
 import com.vitorpamplona.amethyst.ui.note.LoadDecryptedContent
+import com.vitorpamplona.amethyst.ui.note.ReplyInformationChannel
 import com.vitorpamplona.amethyst.ui.note.ReplyNoteComposition
 import com.vitorpamplona.amethyst.ui.note.elements.DisplayUncitedHashtags
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
@@ -49,10 +50,13 @@ import com.vitorpamplona.amethyst.ui.theme.StdVertSpacer
 import com.vitorpamplona.amethyst.ui.theme.placeholderText
 import com.vitorpamplona.quartz.nip01Core.tags.hashtags.hasHashtags
 import com.vitorpamplona.quartz.nip01Core.tags.people.hasAnyTaggedUser
+import com.vitorpamplona.quartz.nip01Core.tags.people.taggedUsers
 import com.vitorpamplona.quartz.nip10Notes.BaseThreadedEvent
 import com.vitorpamplona.quartz.nip10Notes.TextNoteEvent
 import com.vitorpamplona.quartz.nip14Subject.subject
 import com.vitorpamplona.quartz.nip72ModCommunities.definition.CommunityDefinitionEvent
+import kotlinx.collections.immutable.persistentListOf
+import kotlinx.collections.immutable.toImmutableList
 
 @Composable
 fun RenderTextEvent(
@@ -98,6 +102,17 @@ fun RenderTextEvent(
             ReplyNoteComposition(replyingDirectlyTo, backgroundColor, accountViewModel, nav)
             Spacer(modifier = StdVertSpacer)
         }
+    } else if (!unPackReply && !makeItShort && noteEvent is BaseThreadedEvent && noteEvent.hasAnyTaggedUser()) {
+        val mentions =
+            remember(noteEvent) {
+                noteEvent.taggedUsers().map { it.pubKey }.toImmutableList()
+            }
+        ReplyInformationChannel(
+            replyTo = persistentListOf(note),
+            mentions = mentions,
+            accountViewModel = accountViewModel,
+            nav = nav,
+        )
     }
 
     // Check if this is an audio-only event (content is just an audio URL with waveform IMeta)