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/components/kinerja-divisi.tsx

@@ -1,11 +1,6 @@
 import { Badge } from "@/components/ui/badge";
 import { Button } from "@/components/ui/button"; // Correct import for Button
-import {
-	Card,
-	CardContent,
-	CardHeader,
-	CardTitle,
-} from "@/components/ui/card";
+import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
 import { Progress } from "@/components/ui/progress";
 import {
 	Table,