Prevent deleted messages from being pinned

ts/messageModifiers/PinnedMessages.preload.ts

@@ -224,6 +224,10 @@ function validatePinnedMessageTarget(
     return { error: 'Sender does not have access to edit group attributes' };
   }
 
+  if (message.deletedForEveryone) {
+    return { error: 'Cannot pin deleted message' };
+  }
+
   if (isGiftBadge(message)) {
     return { error: 'Cannot pin gift badge messages' };
   }

ts/state/selectors/message.preload.ts

@@ -2622,6 +2622,9 @@ export function canPinMessage(
   if (!canPinMessages(conversation)) {
     return false;
   }
+  if (message.deletedForEveryone) {
+    return false;
+  }
   if (isGiftBadge(message)) {
     return false;
   }