fix: use ES module import for logo in Shell.tsx

- Import logoImg from assets instead of hardcoded path
- Fixes logo not displaying in production build

marketplace/src/layouts/Shell.tsx

@@ -3,6 +3,7 @@ import { Link } from 'react-router-dom'
 import { useAuth } from '../context/AuthContext'
 import { useCartStore, selectCartSummary } from '../stores/cartStore'
 import { formatCurrency } from '../utils/format'
+import logoImg from '../assets/logo.png'
 
 // Cart dropdown content component
 function CartDropdownContent() {
@@ -91,7 +92,7 @@ export function Shell({ children }: { children: React.ReactNode }) {
     <div className="min-h-screen bg-gray-100">
       <header className="flex items-center justify-between bg-medicalBlue px-6 py-4 text-white shadow-md">
         <div className="flex items-center gap-3">
-          <img src="/src/assets/logo.png" alt="SaveInMed" className="h-10 w-auto" />
+          <img src={logoImg} alt="SaveInMed" className="h-10 w-auto" />
           <div>
             <p className="text-lg font-semibold">SaveInMed</p>
             <p className="text-sm text-gray-100">