feat(web): integrate session management and improve API error handling

apps/web/app/dashboard/layout.tsx

@@ -1,12 +1,10 @@
 import { ReactNode } from "react";
 import Sidebar from "@/components/sidebar";
 import { ReactQueryProvider } from "@/components/query-provider";
-import { SessionWatcher } from "@/components/session-watcher";
 
 export default function DashboardLayout({ children }: { children: ReactNode }) {
   return (
     <div className="flex h-dvh bg-background">
-      <SessionWatcher />
       <Sidebar />
 
       {/* Main content */}