feat(wasm): expose generate_recovery_qr and unwrap_recovery_qr bindings

crates/relicario-wasm/src/lib.rs

@@ -486,6 +486,42 @@ pub fn parse_lastpass_csv_json(csv_bytes: &[u8]) -> Result<String, JsError> {
     Ok(json.to_string())
 }
 
+// ── Recovery QR bindings ─────────────────────────────────────────────────────
+
+use relicario_core::{generate_recovery_qr, recovery_qr_to_svg, unwrap_recovery_qr};
+
+/// Generate a recovery QR SVG for the current session.
+/// Returns the SVG string. The passphrase wraps the image_secret under a
+/// separate key (domain-separated from the master key derivation).
+#[wasm_bindgen]
+pub fn wasm_generate_recovery_qr(
+    handle: &SessionHandle,
+    passphrase: &str,
+) -> Result<String, JsError> {
+    let image_secret_bytes = session::with_image_secret(handle.0, |s| s.to_vec())
+        .ok_or_else(|| JsError::new("invalid or locked session handle"))?;
+    let image_secret: &[u8; 32] = image_secret_bytes.as_slice().try_into()
+        .map_err(|_| JsError::new("image_secret must be 32 bytes"))?;
+    let payload = generate_recovery_qr(passphrase, image_secret)
+        .map_err(|e| JsError::new(&e.to_string()))?;
+    Ok(recovery_qr_to_svg(&payload))
+}
+
+/// Unwrap a recovery QR payload (base64-encoded 109-byte blob) using the passphrase.
+/// Returns the raw image_secret bytes (32 bytes).
+#[wasm_bindgen]
+pub fn wasm_unwrap_recovery_qr(
+    payload_b64: &str,
+    passphrase: &str,
+) -> Result<Vec<u8>, JsError> {
+    use base64::{engine::general_purpose::STANDARD, Engine};
+    let bytes = STANDARD.decode(payload_b64)
+        .map_err(|e| JsError::new(&format!("base64: {e}")))?;
+    let recovered = unwrap_recovery_qr(&bytes, passphrase)
+        .map_err(|e| JsError::new(&e.to_string()))?;
+    Ok(recovered.to_vec())
+}
+
 #[cfg(test)]
 mod session_tests {
     use super::*;