feat: add profile route and sidebar navigation; implement inventory and view product pages

- Added a new profile route under the hidden layout.
- Introduced a Sidebar component for navigation between inventory, add product, and profile pages.
- Created InventoryPage to display a list of products with sorting and pagination.
- Implemented ViewProduct page to show details of a selected product.
- Integrated API calls for fetching products and product details.
- Updated route tree to include new routes and components.

frontend/src/routes/app/_hiddenLayout/inventory.tsx

@@ -1,5 +1,6 @@
 import { createFileRoute, redirect } from "@tanstack/react-router";
 import { isAuthenticated } from "../../../utils/auth";
+import { InventoryPage } from "../../../pages/Inventory";
 
 export const Route = createFileRoute("/app/_hiddenLayout/inventory")({
   beforeLoad: async () => {
@@ -13,9 +14,5 @@ export const Route = createFileRoute("/app/_hiddenLayout/inventory")({
 });
 
 function RouteComponent() {
-  return (
-    <>
-      <p>Inventar</p>
-    </>
-  );
+  return <InventoryPage />;
 }