refactor: conditionally render the create order button based on filtered orders state

apps/mobile/packages/features/client/view_orders/lib/src/presentation/pages/view_orders_page.dart

@@ -222,16 +222,17 @@ class _ViewOrdersViewState extends State<ViewOrdersView> {
                         fontWeight: FontWeight.bold,
                       ),
                     ),
-                    UiButton.primary(
-                      text: t.client_view_orders.post_button,
-                      leadingIcon: UiIcons.add,
-                      onPressed: () => Modular.to.navigateToCreateOrder(),
-                      size: UiButtonSize.small,
-                      style: ElevatedButton.styleFrom(
-                        minimumSize: const Size(0, 48),
-                        maximumSize: const Size(0, 48),
+                    if (state.filteredOrders.isNotEmpty)
+                      UiButton.primary(
+                        text: t.client_view_orders.post_button,
+                        leadingIcon: UiIcons.add,
+                        onPressed: () => Modular.to.navigateToCreateOrder(),
+                        size: UiButtonSize.small,
+                        style: ElevatedButton.styleFrom(
+                          minimumSize: const Size(0, 48),
+                          maximumSize: const Size(0, 48),
+                        ),
                       ),
-                    ),
                   ],
                 ),
               ),