feat: implement import functionality with tab navigation for receipts and invoices

frontend/app/Navigation.tsx

@@ -90,7 +90,7 @@ export default function Navigation() {
         ⚙️ Admin
       </Link>
       <Link
-        href="/recipes/create"
+        href="/import"
         style={{
           padding: '0.5rem 0.75rem',
           background: '#fff',
@@ -102,7 +102,7 @@ export default function Navigation() {
           fontWeight: 500,
         }}
       >
-        ⚡ Snabbimport recept
+        📥 Importera
       </Link>
       <Link
         href="/matplan"
@@ -119,21 +119,6 @@ export default function Navigation() {
       >
         📅 Matplan
       </Link>
-      <Link
-        href="/kvitto"
-        style={{
-          padding: '0.5rem 0.75rem',
-          background: '#fff',
-          border: '1px solid #ddd',
-          borderRadius: '4px',
-          textDecoration: 'none',
-          color: '#0070f3',
-          fontSize: '0.9rem',
-          fontWeight: 500,
-        }}
-      >
-        🧾 Importera kvitto
-      </Link>
     </nav>
   );
 }