feat: pin icon for Buzz channels, fix Added padding, show "You:" in Messages

- Swap the Buzz community channel favorite from a Star to a PushPin icon
  (and rename the buzz_star/buzz_unstar strings to buzz_pin/buzz_unpin),
  since the action only pins a channel to the top of the list — it never
  publishes anything, unlike Add which imports into the kind-10009 list.
- Give the "Added" state in BuzzImportRow trailing padding so its label no
  longer jams against the row edge when the Add button flips to Added.
- Prefix a Messages-list DM preview with "You:" when the newest message was
  sent by the logged-in user, so a room shows who spoke last.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012dtx8Shek4sSAXmHjnNMJF

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

@@ -146,15 +146,20 @@ private fun BuzzImportRowContent(
         if (onToggleStar != null) {
             IconButton(onClick = onToggleStar) {
                 Icon(
-                    symbol = if (isStarred) MaterialSymbols.Star else MaterialSymbols.StarBorder,
-                    contentDescription = stringRes(if (isStarred) R.string.buzz_unstar else R.string.buzz_star),
+                    symbol = MaterialSymbols.PushPin,
+                    contentDescription = stringRes(if (isStarred) R.string.buzz_unpin else R.string.buzz_pin),
                     tint = if (isStarred) MaterialTheme.colorScheme.primary else MaterialTheme.colorScheme.onSurfaceVariant,
                     modifier = Modifier.size(20.dp),
                 )
             }
         }
         if (isAdded) {
-            Row(verticalAlignment = Alignment.CenterVertically) {
+            // Match the OutlinedButton's trailing content padding so the label doesn't jam against
+            // the row edge (and doesn't jump horizontally) when Add flips to Added.
+            Row(
+                modifier = Modifier.padding(end = 12.dp),
+                verticalAlignment = Alignment.CenterVertically,
+            ) {
                 Icon(
                     symbol = MaterialSymbols.Check,
                     contentDescription = null,

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

@@ -864,7 +864,12 @@ private fun RowScope.LastMessagePreview(
 
         val text =
             when (preview) {
-                is ChatPreview.Body -> preview.text
+                is ChatPreview.Body -> {
+                    // Mark my own newest message with a "You:" prefix (like other messengers) so a
+                    // 1:1 room's preview shows who spoke last instead of reading like the counterpart.
+                    val sentByMe = lastMessage.author?.pubkeyHex == accountViewModel.account.signer.pubKey
+                    if (sentByMe) stringRes(R.string.chat_preview_you_prefix, preview.text) else preview.text
+                }
                 ChatPreview.Decrypting -> stringRes(R.string.chat_preview_decrypting)
                 ChatPreview.Undecryptable -> stringRes(R.string.could_not_decrypt_the_message)
                 ChatPreview.Missing -> stringRes(R.string.referenced_event_not_found)

amethyst/src/main/res/values-hi-rIN/strings.xml

@@ -3154,8 +3154,8 @@
     <string name="buzz_invite_copy">अनुकृति</string>
     <string name="buzz_invite_error_title">आमन्त्रण बनाने में असफल</string>
     <string name="buzz_invite_dismiss">ठीक</string>
-    <string name="buzz_star">प्रणाली ताराचिह्नित करें</string>
-    <string name="buzz_unstar">प्रणाली ताराचिह्न हटाएँ</string>
+    <string name="buzz_pin">चैनल पिन करें</string>
+    <string name="buzz_unpin">चैनल अनपिन करें</string>
     <string name="buzz_dm_section_empty">कोई संवाद नहीं अब तक</string>
     <plurals name="buzz_dm_see_all_count">
         <item quantity="one">देखें %1$d और संवाद</item>

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

@@ -31,6 +31,8 @@
     <string name="could_not_decrypt_the_message">Could not decrypt the message</string>
     <!-- Placeholder shown in a chat row while an encrypted message is still being decrypted -->
     <string name="chat_preview_decrypting">Decrypting…</string>
+    <!-- Prefix on a Messages-list preview when the newest message was sent by the logged-in user. %1$s is the message text -->
+    <string name="chat_preview_you_prefix">You: %1$s</string>
     <string name="group_picture">Group Picture</string>
     <string name="explicit_content">Explicit Content</string>
     <string name="relay_notice">Relay Notice</string>
@@ -3486,8 +3488,8 @@
     <string name="buzz_invite_copy">Copy</string>
     <string name="buzz_invite_error_title">Couldn\'t create invite</string>
     <string name="buzz_invite_dismiss">OK</string>
-    <string name="buzz_star">Star channel</string>
-    <string name="buzz_unstar">Unstar channel</string>
+    <string name="buzz_pin">Pin channel</string>
+    <string name="buzz_unpin">Unpin channel</string>
     <string name="buzz_dm_section_empty">No conversations yet</string>
     <plurals name="buzz_dm_see_all_count">
         <item quantity="one">See %1$d more conversation</item>