refactor(qr): improve QR code scanning robustness and error handling

- Enhance JWT extraction with unified path handling and validation
- Add debouncing to prevent duplicate scans
- Improve error handling and logging throughout QR flow
- Add proper TypeScript interfaces for QR scan results
- Implement mobile app lifecycle handlers (pause/resume)
- Enhance logging with structured data and consistent levels
- Clean up scanner resources properly on component destroy
- Split contact handling into separate method for better organization
- Add proper type for UserNameDialog ref

This commit improves the reliability and maintainability of the QR code
scanning functionality while adding better error handling and logging.

src/services/QRScanner/CapacitorQRScanner.ts

@@ -86,15 +86,18 @@ export class CapacitorQRScanner implements QRScannerService {
       };
 
       logger.log("Scanner options:", scanOptions);
-      
+
       // Add listener for barcode scans
-      const handle = await BarcodeScanner.addListener('barcodeScanned', (result) => {
-        if (this.scanListener) {
-          this.scanListener.onScan(result.barcode.rawValue);
-        }
-      });
+      const handle = await BarcodeScanner.addListener(
+        "barcodeScanned",
+        (result) => {
+          if (this.scanListener) {
+            this.scanListener.onScan(result.barcode.rawValue);
+          }
+        },
+      );
       this.listenerHandles.push(handle.remove);
-      
+
       // Start continuous scanning
       await BarcodeScanner.startScan(scanOptions);
     } catch (error) {