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/components/QRScanner/QRScannerDialog.vue

@@ -92,9 +92,9 @@ interface ScanProps {
   },
 })
 export default class QRScannerDialog extends Vue {
-  @Prop({ type: Function, required: true }) onScan!: ScanProps['onScan'];
-  @Prop({ type: Function }) onError?: ScanProps['onError'];
-  @Prop({ type: Object }) options?: ScanProps['options'];
+  @Prop({ type: Function, required: true }) onScan!: ScanProps["onScan"];
+  @Prop({ type: Function }) onError?: ScanProps["onError"];
+  @Prop({ type: Object }) options?: ScanProps["options"];
 
   visible = true;
   error: string | null = null;
@@ -132,7 +132,8 @@ export default class QRScannerDialog extends Vue {
       await promise;
       this.error = null;
     } catch (error) {
-      const wrappedError = error instanceof Error ? error : new Error(String(error));
+      const wrappedError =
+        error instanceof Error ? error : new Error(String(error));
       this.error = wrappedError.message;
       if (this.onError) {
         this.onError(wrappedError);
@@ -146,7 +147,8 @@ export default class QRScannerDialog extends Vue {
       this.onScan(result);
       this.close();
     } catch (error) {
-      const wrappedError = error instanceof Error ? error : new Error(String(error));
+      const wrappedError =
+        error instanceof Error ? error : new Error(String(error));
       this.error = wrappedError.message;
       if (this.onError) {
         this.onError(wrappedError);