fix: dedupe emoji pack addresses in My Emoji List grid

A kind 10030 emoji selection event can carry the same `a` tag more than
once. MyEmojiListScreen keys its LazyVerticalGrid items by
address.toValue(), so a duplicate address crashed Compose with
"Key ... was already used". Deduplicate on the same value used as the
grid key before rendering.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012fxWguG7dXgwwe2Et3JBjR

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/emojipacks/membershipManagement/MyEmojiListScreen.kt

@@ -104,7 +104,11 @@ private fun MyEmojiListView(
             selectionNote,
             accountViewModel,
         ) { event ->
-            event?.emojiPacks() ?: emptyList()
+            // The kind 10030 selection event can carry the same `a` tag more than once (e.g. a pack
+            // added twice). The grid below keys items by `address.toValue()`, so duplicates would
+            // throw an IllegalArgumentException ("Key ... was already used"). Dedupe on the same
+            // value used as the key.
+            event?.emojiPacks()?.distinctBy { it.toValue() } ?: emptyList()
         }
 
         Column(