feat: seedpgp v1.1.0 - BIP39 mnemonic PGP encryption tool

- Implement cv25519 PGP encryption/decryption
- Add Base45 encoding with CRC16 integrity checks
- Create SEEDPGP1 frame format for QR codes
- Support BIP39 passphrase flag indicator
- Add comprehensive test suite with Trezor BIP39 vectors
- 15 passing tests covering all core functionality

src/components/QrDisplay.tsx

@@ -0,0 +1,31 @@
+import { useEffect, useState } from 'react';
+import QRCode from 'qrcode';
+
+interface QrDisplayProps {
+    value: string;
+}
+
+export const QrDisplay: React.FC<QrDisplayProps> = ({ value }) => {
+    const [dataUrl, setDataUrl] = useState<string>('');
+
+    useEffect(() => {
+        if (value) {
+            QRCode.toDataURL(value, {
+                errorCorrectionLevel: 'Q',
+                type: 'image/png',
+                width: 512,
+                margin: 2,
+            })
+                .then(setDataUrl)
+                .catch(console.error);
+        }
+    }, [value]);
+
+    if (!dataUrl) return null;
+
+    return (
+        <div className="flex items-center justify-center p-4 bg-white rounded-xl border-2 border-slate-200">
+            <img src={dataUrl} alt="SeedPGP QR Code" className="w-64 h-64" />
+        </div>
+    );
+};