feat(mobile): add complete consent flow (banner, health modal, privacy, i18n)

apps/frontend-mobile/app/scanner.tsx

@@ -3,12 +3,16 @@ import { View, StyleSheet } from 'react-native';
 import { useRouter } from 'expo-router';
 import { BarcodeScanner } from '../components/BarcodeScanner';
 import { searchMedicines } from '../services/medicines';
+import { hasConsent } from '../services/consent';
+import HealthConsentModal from '../components/HealthConsentModal';
 
 export default function ScannerScreen() {
   const router = useRouter();
   const [isSearching, setIsSearching] = useState(false);
+  const [showHealthConsent, setShowHealthConsent] = useState(false);
+  const [pendingBarcode, setPendingBarcode] = useState<string | null>(null);
 
-  const handleBarcodeScanned = async (barcode: string) => {
+  const processBarcode = async (barcode: string) => {
     setIsSearching(true);
     try {
       const results = await searchMedicines(barcode);
@@ -25,6 +29,16 @@ export default function ScannerScreen() {
     }
   };
 
+  const handleBarcodeScanned = async (barcode: string) => {
+    const healthConsent = await hasConsent('health_data');
+    if (!healthConsent) {
+      setPendingBarcode(barcode);
+      setShowHealthConsent(true);
+      return;
+    }
+    await processBarcode(barcode);
+  };
+
   const handleClose = () => {
     router.back();
   };
@@ -35,6 +49,24 @@ export default function ScannerScreen() {
         onBarcodeScanned={handleBarcodeScanned}
         onClose={handleClose}
       />
+      {showHealthConsent && (
+        <HealthConsentModal
+          onAccept={async () => {
+            setShowHealthConsent(false);
+            if (pendingBarcode) {
+              const { saveConsents, getLocalConsents } = await import('../services/consent');
+              const current = await getLocalConsents();
+              await saveConsents({ ...current, health_data: true });
+              await processBarcode(pendingBarcode);
+              setPendingBarcode(null);
+            }
+          }}
+          onCancel={() => {
+            setShowHealthConsent(false);
+            setPendingBarcode(null);
+          }}
+        />
+      )}
     </View>
   );
 }