fix: Add abort mechanism for conditional UI to prevent pending request errors

- Add global AbortController for conditional UI requests
- Call abortConditionalUI() at start of registerPasskey and authenticatePasskey
- Export abortConditionalUI from index for manual use if needed

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/encryptid/index.ts

@@ -16,6 +16,7 @@ export {
   registerPasskey,
   authenticatePasskey,
   startConditionalUI,
+  abortConditionalUI,
   isConditionalMediationAvailable,
   detectCapabilities,
   bufferToBase64url,

src/encryptid/webauthn.ts

@@ -44,6 +44,21 @@ const DEFAULT_CONFIG: EncryptIDConfig = {
   timeout: 60000,
 };
 
+// Global abort controller for conditional UI
+let conditionalUIAbortController: AbortController | null = null;
+
+/**
+ * Abort any pending conditional UI request
+ * Call this before starting registration or authentication
+ */
+export function abortConditionalUI(): void {
+  if (conditionalUIAbortController) {
+    conditionalUIAbortController.abort();
+    conditionalUIAbortController = null;
+    console.log('EncryptID: Conditional UI aborted');
+  }
+}
+
 // ============================================================================
 // UTILITY FUNCTIONS
 // ============================================================================
@@ -108,6 +123,9 @@ export async function registerPasskey(
   displayName: string,
   config: Partial<EncryptIDConfig> = {}
 ): Promise<EncryptIDCredential> {
+  // Abort any pending conditional UI to prevent "request already pending" error
+  abortConditionalUI();
+
   const cfg = { ...DEFAULT_CONFIG, ...config };
 
   // Check WebAuthn support
@@ -237,6 +255,9 @@ export async function authenticatePasskey(
   credentialId?: string,  // Optional: specify credential, or let user choose
   config: Partial<EncryptIDConfig> = {}
 ): Promise<AuthenticationResult> {
+  // Abort any pending conditional UI to prevent "request already pending" error
+  abortConditionalUI();
+
   const cfg = { ...DEFAULT_CONFIG, ...config };
 
   // Check WebAuthn support
@@ -358,6 +379,12 @@ export async function startConditionalUI(
     return null;
   }
 
+  // Abort any existing conditional UI request
+  abortConditionalUI();
+
+  // Create new abort controller for this request
+  conditionalUIAbortController = new AbortController();
+
   const cfg = { ...DEFAULT_CONFIG, ...config };
   const challenge = generateChallenge();
   const prfSalt = await generatePRFSalt('master-key');
@@ -380,8 +407,12 @@ export async function startConditionalUI(
       },
       // @ts-ignore - conditional mediation
       mediation: 'conditional',
+      signal: conditionalUIAbortController.signal,
     }) as PublicKeyCredential;
 
+    // Clear abort controller on success
+    conditionalUIAbortController = null;
+
     if (!credential) {
       return null;
     }