fix(6): fix TypeScript type consistency issues

- Make Item.id required (items from DB always have id)
- Use shared Item type from db.ts in QuantityAdjustmentModal
- Show full npm build output instead of silencing errors
- Ensures all modals use consistent type definitions

frontend/components/inventory/QuantityAdjustmentModal.tsx

@@ -4,16 +4,7 @@ import { useState, useEffect } from 'react';
 import { X } from 'lucide-react';
 import QuantityDisplay from './QuantityDisplay';
 import axios from 'axios';
-
-interface Item {
-  id: number;
-  name: string;
-  quantity: number;
-  part_number?: string;
-  barcode?: string;
-  category?: string;
-  description?: string;
-}
+import { Item } from '@/lib/db';
 
 interface QuantityAdjustmentModalProps {
   item: Item | null;