fix: log error action in syncRsvpToAtproto instead of silently dropping

The syncRsvpToAtproto method handled 'published' and 'skipped' actions
but silently ignored 'error', hiding AT Protocol publish failures
(e.g. missing OAuth session for non-custodial users).

Closes: om-ldoy

Author: tompscanlan

src/event-attendee/event-attendee.service.ts

@@ -204,6 +204,15 @@ export class EventAttendeeService {
       this.logger.debug(
         `[syncRsvpToAtproto] Skipped - event not eligible for AT Protocol publishing`,
       );
+    } else if (publishResult.action === 'error') {
+      this.logger.warn(
+        `[syncRsvpToAtproto] RSVP ${attendee.id} saved but AT Protocol publish failed: ${publishResult.error}`,
+        {
+          attendeeId: attendee.id,
+          eventSlug: attendee.event?.slug,
+          needsOAuthLink: publishResult.needsOAuthLink,
+        },
+      );
     }
   }