Compaction overhaul (#5186)

Co-authored-by: Douwe Osinga <douwe@squareup.com>
Co-authored-by: David Katz <dkatz@squareup.com>
Co-authored-by: Alex Hancock <alexhancock@block.xyz>

ui/desktop/src/components/ProgressiveMessageList.tsx

@@ -172,7 +172,9 @@ export default function ProgressiveMessageList({
     const messagesToRender = messages.slice(0, renderedCount);
     return messagesToRender
       .map((message, index) => {
-        // Use custom render function if provided
+        if (!message.metadata.userVisible) {
+          return null;
+        }
         if (renderMessage) {
           return renderMessage(message, index);
         }