feat: Implement dark/light mode toggle and address linting issues

This commit introduces a functional dark/light mode toggle by integrating
`next-themes` with the application. It configures `ThemeProvider` in
`src/frontend.tsx` and sets `darkMode: 'class'` in `tailwind.config.js`.

Additionally, this commit resolves several linting and parsing issues
found in `src/index.ts`.

This commit also includes other pre-existing modifications and new
components within the project's working directory that were not
specifically part of the dark mode or linting tasks.

src/routes/dashboard/index.ts

@@ -0,0 +1,5 @@
+import { createFileRoute } from "@tanstack/react-router";
+import { DashboardContent } from "../../app/components/dashboard-content";
+export const Route = createFileRoute("/dashboard/")({
+	component: DashboardContent,
+});

src/routes/dashboard/kinerja-divisi.ts

@@ -0,0 +1,5 @@
+import { createFileRoute } from "@tanstack/react-router";
+import KinerjaDivisi from "../../app/components/kinerja-divisi";
+export const Route = createFileRoute("/dashboard/kinerja-divisi")({
+	component: KinerjaDivisi,
+});

src/routes/dashboard/pengaduan-layanan-publik.ts

@@ -0,0 +1,5 @@
+import { createFileRoute } from "@tanstack/react-router";
+import PengaduanLayananPublik from "../../app/components/pengaduan-layanan-publik";
+export const Route = createFileRoute("/dashboard/pengaduan-layanan-publik")({
+	component: PengaduanLayananPublik,
+});

src/routes/dashboard/route.tsx

@@ -0,0 +1,27 @@
+import { createFileRoute, Outlet } from "@tanstack/react-router";
+import { Header } from "@/app/components/header";
+import { Sidebar } from "@/app/components/sidebar";
+
+export const Route = createFileRoute("/dashboard")({
+	component: RouteComponent,
+});
+
+function RouteComponent() {
+	return (
+		<div className="h-screen flex overflow-hidden bg-gray-100 dark:bg-gray-900">
+			{/* Sidebar */}
+			<Sidebar />
+
+			{/* Main Content */}
+			<div className="flex-1 flex flex-col overflow-hidden">
+				{/* Header */}
+				<Header />
+
+				{/* Dashboard Content */}
+				<main className="flex-1 overflow-y-auto p-8">
+					<Outlet />
+				</main>
+			</div>
+		</div>
+	);
+}