DentaQuest stores its MFA trust as a persistent cookie, not in
LocalStorage like DDMA/Azure B2C. Deleting the Cookies file on startup
wiped that trust token, forcing OTP on every app restart. Now only the
credentials tracking file is reset on startup; if credentials change,
_force_logout() still calls delete_all_cookies() for a full reset.
Covers both eligibility and claim flows (both share the same
DentaQuestBrowserManager singleton).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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