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/seedpgp.ts

@@ -308,29 +308,23 @@ export async function decryptFromSeed(params: DecryptionParams): Promise<SeedPgp
  */
 export function detectEncryptionMode(text: string): EncryptionMode {
     const trimmed = text.trim();
-    
-    // Check for SEEDPGP1 format
+
+    // 1. Check for SEEDPGP1 format (most specific)
     if (trimmed.startsWith('SEEDPGP1:')) {
         return 'pgp';
     }
-    
-    // Check for hex format (Krux KEF)
-    const cleaned = trimmed.replace(/\s/g, '').replace(/^KEF:/i, '');
-    if (/^[0-9a-fA-F]+$/.test(cleaned) && cleaned.length % 2 === 0) {
-        // Try to parse as KEF to confirm
-        try {
-            const bytes = hexToBytes(cleaned);
-            if (bytes.length >= 5) {
-                const lenId = bytes[0];
-                if (lenId > 0 && lenId <= 252 && 1 + lenId + 4 <= bytes.length) {
-                    return 'krux';
-                }
-            }
-        } catch {
-            // Not valid KEF, fall through
-        }
+
+    // 2. Check for Krux KEF format (hex, optional KEF: prefix)
+    const cleanedHex = trimmed.replace(/\s/g, '').replace(/^KEF:/i, '');
+    if (/^[0-9a-fA-F]+$/.test(cleanedHex) && cleanedHex.length > 10) { // check for hex and minimum length
+        return 'krux';
+    }
+
+    // 3. If it contains spaces, it's almost certainly a plain text mnemonic
+    if (trimmed.includes(' ')) {
+        return 'text';
     }
     
-    // Default to PGP for backward compatibility
-    return 'pgp';
+    // 4. Default to text for anything else. The component validation will handle it.
+    return 'text';
 }

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;