Body fixed to 100dvh with overflow:hidden. SOS button capped at
min(60vmin, 70vw, 300px) to fit within viewport alongside topbar.
Bump SW cache to v3.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Only @tutlot.com emails allowed for registration (checked server-side,
invisible to frontend inspect). Wrong domain → scary message + IP
violation tracked. 5 violations → IP permanently blocked from login
and registration. Block screen with OK button on frontend.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
