Projects were previously global to anyone who could reach the server.
Adds email/password accounts with httpOnly cookie sessions, scopes
every project (both SQLite and localStorage) to the signed-in user,
and auto-claims pre-existing unowned projects for whoever registers
first. Also adds optional TOTP two-factor auth with backup codes,
managed from a new Account Settings page, since there's no
password-reset flow to fall back on otherwise.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
nmemmert
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