feat: Add functionality to move inventory items to pantry and enhance pantry management

- Implemented moveInventoryItemToPantry method in InventoryRepository to facilitate moving items from inventory to pantry.
- Enhanced InventoryScreen with a new header section providing context about the inventory.
- Added a button in SwipeableInventoryTile to move items to pantry with appropriate error handling.
- Introduced movePantryItemToInventory method in PantryRepository to support moving items back to inventory.
- Refactored PantryScreen to rename _addToInventory to _moveToInventory for clarity and updated UI to reflect changes.
- Added AdminPantryItem model to represent pantry items in the admin panel.
- Created AdminPantryPanel for managing pantry items, including moving items to inventory and listing users.
- Developed AdminPrivateProductsPanel for managing private products, allowing promotion to global products.

backend/src/inventory/inventory.service.ts

@@ -348,6 +348,51 @@ export class InventoryService {
     return this.prisma.inventoryItem.delete({ where: { id } });
   }
 
+  private async moveInventoryItemToPantryCore(item: {
+    id: number;
+    userId: number;
+    productId: number;
+    location: string | null;
+  }) {
+    const existingPantryItem = await this.prisma.pantryItem.findUnique({
+      where: {
+        userId_productId: {
+          userId: item.userId,
+          productId: item.productId,
+        },
+      },
+    });
+
+    if (existingPantryItem) {
+      throw new BadRequestException('Produkten finns redan i baslagret');
+    }
+
+    return this.prisma.$transaction(async (tx) => {
+      const pantryItem = await tx.pantryItem.create({
+        data: {
+          userId: item.userId,
+          productId: item.productId,
+          location: item.location?.trim() || null,
+        },
+        include: { product: true },
+      });
+
+      await tx.inventoryItem.delete({ where: { id: item.id } });
+
+      return pantryItem;
+    });
+  }
+
+  async moveToPantry(id: number, userId: number) {
+    const item = await this.findInventoryItemByIdOrThrow(id, userId);
+    return this.moveInventoryItemToPantryCore(item);
+  }
+
+  async moveToPantryAdmin(id: number) {
+    const item = await this.findInventoryItemAnyByIdOrThrow(id);
+    return this.moveInventoryItemToPantryCore(item);
+  }
+
   async updateAdmin(id: number, data: UpdateInventoryDto) {
     await this.findInventoryItemAnyByIdOrThrow(id);