feat: add inventory management components and API integration

- Implemented InventorySalesTab for recording and viewing sales.
- Created InventorySuppliersTab for managing suppliers.
- Developed InventoryView to consolidate inventory-related tabs.
- Added API functions for handling products, suppliers, sales, and GRNs.
- Defined necessary TypeScript models for inventory entities.
- Updated navigation to include an Inventory section.

src/hooks/use-nav-items.ts

@@ -9,6 +9,7 @@ import {
   CalendarClock,
   CreditCard,
   LayoutDashboard,
+  Package,
   Receipt,
   Rss,
   Settings,
@@ -27,6 +28,7 @@ const ICON_MAP: Record<string, LucideIcon> = {
   CalendarClock,
   CreditCard,
   LayoutDashboard,
+  Package,
   Receipt,
   Rss,
   Settings,