Refactor decryption logic to handle empty fields consistently across services

lib/errors.ts

@@ -1,14 +1,16 @@
 /**
- * Clean error messages from Electron IPC prefix
- * Transforms: "Error invoking remote method 'channel': Error: Message"
- * Into: "Message"
+ * Extract user-facing error message from various error formats.
+ * Supports: Error objects, Tauri AppError { kind, message }, and plain strings.
  */
 export function cleanErrorMessage(error: unknown): string {
     if (error instanceof Error) {
-        return error.message.replace(/^Error invoking remote method '[^']+': Error: /, '');
+        return error.message;
+    }
+    if (typeof error === 'object' && error !== null && 'message' in error) {
+        return String((error as { message: string }).message);
     }
     if (typeof error === 'string') {
-        return error.replace(/^Error invoking remote method '[^']+': Error: /, '');
+        return error;
     }
     return 'An unknown error occurred';
 }