first commit

frontend/app/(dashboard)/layout.tsx

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+import { Sidebar } from "@/components/layout/sidebar";
+import { Topbar } from "@/components/layout/topbar";
+import { AlarmProvider } from "@/lib/alarm-context";
+import { ThresholdProvider } from "@/lib/threshold-context";
+import { ErrorBoundary } from "@/components/error-boundary";
+import { Toaster } from "sonner";
+
+export default function DashboardLayout({
+  children,
+}: {
+  children: React.ReactNode;
+}) {
+  return (
+    <ThresholdProvider>
+    <AlarmProvider>
+      <div className="flex h-screen overflow-hidden bg-background">
+        <div className="hidden md:flex">
+          <Sidebar />
+        </div>
+        <div className="flex flex-col flex-1 min-w-0 overflow-hidden">
+          <Topbar />
+          <main className="flex-1 overflow-y-auto p-6">
+            <ErrorBoundary>
+              {children}
+            </ErrorBoundary>
+          </main>
+        </div>
+        <Toaster position="bottom-right" theme="dark" richColors />
+      </div>
+    </AlarmProvider>
+    </ThresholdProvider>
+  );
+}