Improve photo capture reliability and address camera access issues

Adds enhanced camera setup, error handling, and canvas drawing in `useCamera.tsx`, `CameraModal.tsx`, and `NewSaleForm.tsx`.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: dec54137-d5a2-4406-8ad4-5f2f9fb110bf
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/0715008c-7244-40f4-befc-26c014852236/e6a2493b-9ed8-4bd8-be32-29049cc60fa3.jpg

client/src/components/NewSaleForm.tsx

@@ -205,7 +205,10 @@ export default function NewSaleForm() {
     if (!currentPhotoType) return;
     
     try {
+      console.log('Attempting to capture photo...');
       const photoData = await capturePhoto();
+      console.log('Photo captured successfully, data length:', photoData.length);
+      
       form.setValue(currentPhotoType === 'recto' ? 'photoRecto' : 'photoVerso', photoData);
       
       toast({
@@ -216,6 +219,7 @@ export default function NewSaleForm() {
       
       stopCamera();
     } catch (error) {
+      console.error('Photo capture error:', error);
       toast({
         title: "Erreur de capture",
         description: error instanceof Error ? error.message : "Erreur lors de la capture",