fix(cordn): name the attachment in the inbox row, and drop the bech32 above the QR

Two things the Messages list and the group info page were showing that nobody
could use.

**A voice note read as an empty message.** The inbox row is built from
`envelope.content`, and a message whose whole content is an attachment has
none — so the row rendered "Dr. Edo Paz: " and trailed off, which looks like
somebody sent nothing. It now names what was sent: Voice note, Photo, Video or
File, chosen off the first attachment's MIME. The first one decides because a
row is one line, and a message with a photo and a file in it is, to someone
skimming an inbox, a message with a photo in it. A withdrawn message says so
too, rather than falling through to the attachment label.

**The share block printed the bech32 above the QR.** Three lines of characters
that are not readable and not meant to be retyped, pushing the QR itself below
the fold. Both things a person actually does with that string are still on the
page — point a camera at the code, or press Copy link.

Verified on the tablet: the row reads "Dr. Edo Paz: Voice note", and the share
section is explainer, QR, Copy link.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

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

@@ -610,11 +610,10 @@ private fun ShareGroup(
         color = MaterialTheme.colorScheme.onSurfaceVariant,
     )
 
-    SelectionContainer {
-        Text(ref, style = MaterialTheme.typography.bodySmall, modifier = Modifier.padding(vertical = 8.dp))
-    }
-
-    QrCodeDrawer(ref, Modifier.size(220.dp))
+    // The bech32 itself is not shown. It is three lines of characters nobody
+    // reads, and both things a person actually does with it are already here:
+    // point a camera at the QR, or press Copy link.
+    QrCodeDrawer(ref, Modifier.padding(top = 8.dp).size(220.dp))
 
     OutlinedButton(
         onClick = {

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

@@ -82,6 +82,11 @@ import com.vitorpamplona.amethyst.commons.resources.concord_server_label
 import com.vitorpamplona.amethyst.commons.resources.cordn_group
 import com.vitorpamplona.amethyst.commons.resources.cordn_group_no_messages_yet
 import com.vitorpamplona.amethyst.commons.resources.cordn_group_untitled
+import com.vitorpamplona.amethyst.commons.resources.cordn_preview_deleted
+import com.vitorpamplona.amethyst.commons.resources.cordn_preview_file
+import com.vitorpamplona.amethyst.commons.resources.cordn_preview_photo
+import com.vitorpamplona.amethyst.commons.resources.cordn_preview_video
+import com.vitorpamplona.amethyst.commons.resources.cordn_preview_voice_note
 import com.vitorpamplona.amethyst.commons.resources.could_not_decrypt_the_message
 import com.vitorpamplona.amethyst.commons.resources.ephemeral_relay_chat
 import com.vitorpamplona.amethyst.commons.resources.geohash_chat
@@ -146,8 +151,10 @@ import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.publicChannels.relayG
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.rooms.dal.ConcordServerRoomNote
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.rooms.dal.RelayGroupServerRoomNote
 import com.vitorpamplona.quartz.buzz.notifications.MemberAddedNotificationEvent
+import com.vitorpamplona.quartz.cordn.appEncryptedMedia.CordnMediaTag
 import com.vitorpamplona.quartz.experimental.bitchat.geohash.GeohashChatEvent
 import com.vitorpamplona.quartz.experimental.ephemChat.chat.EphemeralChatEvent
+import com.vitorpamplona.quartz.nip01Core.core.TagArray
 import com.vitorpamplona.quartz.nip01Core.relay.normalizer.displayUrl
 import com.vitorpamplona.quartz.nip17Dm.base.ChatroomKey
 import com.vitorpamplona.quartz.nip17Dm.base.ChatroomKeyable
@@ -545,6 +552,23 @@ private fun MarmotGroupRoomCompose(
     )
 }
 
+/**
+ * What to call a message whose whole content is an attachment.
+ *
+ * The first attachment decides, which is what the eye does too: a row is one
+ * line and a message with a photo and a file in it is, to a reader skimming the
+ * inbox, a message with a photo in it.
+ */
+private fun attachmentLabelFor(tags: TagArray): StringResource {
+    val first = CordnMediaTag.parseAll(tags).firstOrNull() ?: return Res.string.cordn_preview_file
+    return when {
+        first.isAudio -> Res.string.cordn_preview_voice_note
+        first.isImage -> Res.string.cordn_preview_photo
+        first.mimeType.startsWith("video/") -> Res.string.cordn_preview_video
+        else -> Res.string.cordn_preview_file
+    }
+}
+
 /**
  * One cordn room in the Messages list.
  *
@@ -573,7 +597,17 @@ private fun CordnGroupRoomCompose(
             // inbox while the room shows the edit is the kind of mismatch that
             // reads as a sync bug.
             val text = annotations.contentOf(message.envelope.id) ?: message.envelope.content
-            "$authorName: ${text.take(200)}"
+            // A voice note or a photo carries no text, so the row used to read
+            // "Someone: " and trail off — an attachment looked like an empty
+            // message. Name what was sent instead, the way the bubble does.
+            val preview =
+                text.takeIf { it.isNotBlank() }
+                    ?: if (annotations.isDeleted(message.envelope.id)) {
+                        stringRes(Res.string.cordn_preview_deleted)
+                    } else {
+                        stringRes(attachmentLabelFor(message.envelope.tags))
+                    }
+            "$authorName: ${preview.take(200)}"
         } ?: stringRes(Res.string.cordn_group_no_messages_yet)
 
     ChannelName(

commonsUI/src/commonMain/composeResources/values/strings.xml

@@ -5381,6 +5381,11 @@
          and the new-conversation picker. -->
     <string name="cordn_group_untitled">Group %1$s</string>
     <string name="cordn_group_no_messages_yet">No messages yet</string>
+    <string name="cordn_preview_deleted">Message deleted</string>
+    <string name="cordn_preview_voice_note">Voice note</string>
+    <string name="cordn_preview_photo">Photo</string>
+    <string name="cordn_preview_video">Video</string>
+    <string name="cordn_preview_file">File</string>
     <string name="cordn_group">cordn</string>
     <string name="new_conversation_cordn_title">cordn group</string>
     <string name="new_conversation_cordn_tagline">Encrypted group chat ordered by a coordinator you pick.</string>