Confirm Q8 account/settings IA and ship the closed-beta gap:
- Extend POST /auth/login with display_name (required for DEMO-YKAVU)
- Entry screen tabs: signup vs already-registered login
- Settings hub with tone, autonomy, sessions, data-flow, logout
- Logout revokes current session and clears local token
Co-authored-by: okuma <o0kuma@users.noreply.github.com>
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