feat: add cryptographic utilities and types for secure data handling

webapp/src/vite-env.d.ts

@@ -0,0 +1,10 @@
+/// <reference types="vite/client" />
+
+declare module 'qrcode-generator' {
+  interface QrCode {
+    addData(data: string): void;
+    make(): void;
+    createSvgTag(options?: { scalable?: boolean; margin?: number }): string;
+  }
+  export default function qrcode(typeNumber: number, errorCorrectionLevel: 'L' | 'M' | 'Q' | 'H'): QrCode;
+}