Enhance dashboard functionality with new payment and device management features

- Added new PaymentPage component for processing payments and displaying devices to pay.
- Introduced DeviceDetails component for viewing individual device information.
- Implemented PriceCalculator component for calculating costs based on user input.
- Integrated Jotai for state management across components, including device cart functionality.
- Updated layout to include Jotai Provider for state management.
- Enhanced DevicesTable with AddDevicesToCartButton for adding devices to the cart.
- Refactored sidebar to include a link to the new Price Calculator page.
- Updated Prisma schema to include Payment and BillFormula models for better data handling.
- Added new UI components for device cart management and drawer functionality.
- Improved overall user experience with responsive design adjustments and new UI elements.

hooks/use-formula.ts

@@ -0,0 +1,8 @@
+"use server";
+
+import prisma from "@/lib/db";
+
+export async function useFormula() {
+	const formula = await prisma.billFormula.findFirst();
+	return formula;
+}