Email synchronization marked complete but inbox shows no emails

Source: Onboarding recap with Me Luzayisso (split from original recap).

Reported by: Danilo Schmidt — onboarding 2026-05-06 with Me Luzayisso (nl@etudeluzayisso.ch).

Issue: Email synchronization was marked as completed in the UI, but no emails were visible afterward.

Note: Possibly related to existing email-sync issues, but worth its own ticket because the failure mode is "silent success" (sync reports done but result is empty).