feat: fix CompactSeedQR binary QR code scanning with jsQR library

- Replace BarcodeDetector with jsQR for raw binary byte access
- BarcodeDetector forced UTF-8 decoding which corrupted binary data
- jsQR's binaryData property preserves raw bytes without text conversion
- Fix regex bug: use single backslash \x00 instead of \x00 for binary detection
- Add debug logging for scan data inspection
- QR generation already worked (Krux-compatible), only scanning was broken

Resolves binary QR code scanning for 12/24-word CompactSeedQR format.
Tested with Krux device - full bidirectional compatibility confirmed.

src/lib/types.ts

@@ -21,7 +21,7 @@ export type KruxEncryptionParams = {
     version?: number;
 };
 
-export type EncryptionMode = 'pgp' | 'krux' | 'text';
+export type EncryptionMode = 'pgp' | 'krux' | 'seedqr' | 'text';
 
 export type EncryptionParams = {
     plaintext: SeedPgpPlaintext | string;
@@ -42,7 +42,7 @@ export type DecryptionParams = {
 };
 
 export type EncryptionResult = {
-    framed: string;
+    framed: string | Uint8Array;
     pgpBytes?: Uint8Array;
     recipientFingerprint?: string;
     label?: string;