chore: add husky pre-commit hook and lint-staged configuration

- Created a pre-commit hook in .husky to run lint-staged.
- Added .lintstagedrc.mjs to format frontend files with Prettier and apply Spotless to backend Java files.
- Introduced .prettierignore to exclude specific directories from formatting.

frontend/src/app/components/rent-payment-dialog-result.ts

@@ -5,5 +5,5 @@ export const RENT_PAYMENT_DATA_STALE = 'RENT_PAYMENT_DATA_STALE';
 export type RentPaymentDialogResult = RentPayment | typeof RENT_PAYMENT_DATA_STALE;
 
 export function isRentPaymentDataStale(error: unknown): boolean {
-  return typeof error === 'object' && error !== null && 'status' in error && error.status === 409;
+	return typeof error === 'object' && error !== null && 'status' in error && error.status === 409;
 }