fix: add missing trailing newlines to JS files

Add trailing newlines to stores-registration.js and server-bundle.js
to comply with code style standards.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: ihabadham

client/app/packs/server-bundle.js

@@ -2,4 +2,4 @@
 import './stores-registration';
 
 // import statement added by react_on_rails:generate_packs rake task
-import "./../generated/server-bundle-generated.js";
+import "./../generated/server-bundle-generated.js";

client/app/packs/stores-registration.js

@@ -6,4 +6,4 @@ import commentsStore from '../bundles/comments/store/commentsStore';
 ReactOnRails.registerStore({
   routerCommentsStore,
   commentsStore,
-});
+});