fix(auth): prefer OIDC compat email in pending flow

frontend/src/views/auth/OidcCallbackView.vue

@@ -338,6 +338,7 @@ type PendingOidcCompletion = PendingOAuthExchangeResponse & {
   pending_email?: string
   resolved_email?: string
   existing_account_email?: string
+  compat_email?: string
   email?: string
   suggested_email?: string
   provider_fallback?: string
@@ -461,6 +462,7 @@ function extractPendingAccountEmail(completion: PendingOidcCompletion): string {
   return (
     completion.pending_email ||
     completion.existing_account_email ||
+    completion.compat_email ||
     completion.resolved_email ||
     completion.email ||
     completion.suggested_email ||