refactor: improve code readability and maintainability in MainScene, Messages, and ThreadChat components; adjust comments.scss for better layout

app/src/components/layout/scenes/MainScene.tsx

@@ -212,7 +212,11 @@ function MainScene() {
       {activeModule !== "market" && !selectedUser && <Footer />}
 
       <VersionSaved />
-      {(commentPositionState !== null || selectedComment !== null) && <ThreadChat />}
+
+      {
+        (commentPositionState !== null || selectedComment !== null) &&
+        <ThreadChat />
+      }
 
     </>
   );