fix(blender): improve QR content detection

Fixes a bug where plain text mnemonics and Krux QR codes were being misidentified as encrypted SeedPGP frames.

- The `detectEncryptionMode` function has been rewritten to be stricter and now correctly identifies 'text' as a type.
- It no longer defaults to 'pgp', which was causing plain text to be treated as an encrypted format.
- The `EncryptionMode` type in `types.ts` has been updated to include 'text'.
- This resolves issues where the UI would incorrectly ask for a password for plain text mnemonics and use the wrong decryption logic for Krux QRs.

src/lib/types.ts

@@ -20,7 +20,7 @@ export type KruxEncryptionParams = {
     version?: number;
 };
 
-export type EncryptionMode = 'pgp' | 'krux';
+export type EncryptionMode = 'pgp' | 'krux' | 'text';
 
 export type EncryptionParams = {
     plaintext: SeedPgpPlaintext | string;