refactor: remove progress bar from job loading UI

- Removed progress bar HTML element and CSS
- Removed startProgress() and finishProgress() functions
- Simplified job loading flow (jobs now display instantly)
- Progress tracking removed; jobs render as they load

backend/server.ts

@@ -219,7 +219,7 @@ app.onError((err, c) => {
   return c.text('Internal Server Error', 500);
 });
 
-const PORT = Number(process.env.PORT || 3003);
+const PORT = Number(process.env.PORT || 3000);
 
 logLine('logs/server.log', `Starting frontend server on port ${PORT}`);