feat(qr-scanner): implement WebInlineQRScanner with jsQR integration

- Add jsQR library for QR code detection and scanning
- Implement WebInlineQRScanner class with comprehensive camera handling
- Add detailed logging throughout scanner lifecycle
- Include error handling and cleanup procedures
- Add blur detection for QR codes
- Implement FPS throttling for performance optimization
- Add device compatibility checks and permission handling

The scanner now provides:
- Camera stream management
- QR code detection with blur prevention
- Performance optimized scanning (15 FPS target)
- Detailed logging for debugging
- Proper cleanup of resources

package-lock.json

@@ -57,6 +57,7 @@
         "jdenticon": "^3.2.0",
         "js-generate-password": "^0.1.9",
         "js-yaml": "^4.1.0",
+        "jsqr": "^1.4.0",
         "leaflet": "^1.9.4",
         "localstorage-slim": "^2.7.0",
         "lru-cache": "^10.2.0",
@@ -17734,6 +17735,11 @@
         "node": "*"
       }
     },
+    "node_modules/jsqr": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/jsqr/-/jsqr-1.4.0.tgz",
+      "integrity": "sha512-dxLob7q65Xg2DvstYkRpkYtmKm2sPJ9oFhrhmudT1dZvNFFTlroai3AWSpLey/w5vMcLBXRgOJsbXpdN9HzU/A=="
+    },
     "node_modules/katex": {
       "version": "0.16.22",
       "resolved": "https://registry.npmjs.org/katex/-/katex-0.16.22.tgz",