feat: add boards and tasks management endpoints

frontend/src/app/dashboard/page.tsx

@@ -0,0 +1,50 @@
+"use client";
+
+import { useRouter } from "next/navigation";
+
+import { SignInButton, SignedIn, SignedOut } from "@clerk/nextjs";
+
+import { DashboardSidebar } from "@/components/organisms/DashboardSidebar";
+import { DashboardShell } from "@/components/templates/DashboardShell";
+import { Button } from "@/components/ui/button";
+
+export default function DashboardPage() {
+  const router = useRouter();
+
+  return (
+    <DashboardShell>
+      <SignedOut>
+        <div className="flex h-full flex-col items-center justify-center gap-4 rounded-xl border-2 border-gray-200 bg-white p-10 text-center shadow-lush">
+          <p className="text-sm text-gray-600">
+            Sign in to access your dashboard.
+          </p>
+          <SignInButton
+            mode="modal"
+            afterSignInUrl="/boards"
+            afterSignUpUrl="/boards"
+            forceRedirectUrl="/boards"
+            signUpForceRedirectUrl="/boards"
+          >
+            <Button className="border-2 border-gray-900 bg-gray-900 text-white">
+              Sign in
+            </Button>
+          </SignInButton>
+        </div>
+      </SignedOut>
+      <SignedIn>
+        <DashboardSidebar />
+        <div className="flex h-full flex-col items-center justify-center gap-4 rounded-xl border-2 border-gray-200 bg-white p-10 text-center shadow-lush">
+          <p className="text-sm text-gray-600">
+            Your work lives in boards. Jump in to manage tasks.
+          </p>
+          <Button
+            className="border-2 border-gray-900 bg-gray-900 text-white"
+            onClick={() => router.push("/boards")}
+          >
+            Go to boards
+          </Button>
+        </div>
+      </SignedIn>
+    </DashboardShell>
+  );
+}