Turns Security Center into an Activity → Devices → Passkeys mobile flow with sticky 44px navigation, alert-to-remediation handoffs, bounded Back history, focus restoration, and post-revocation activity refresh.
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Closes #1020
Turns Security Center into an Activity → Devices → Passkeys mobile flow with sticky 44px navigation, alert-to-remediation handoffs, bounded Back history, focus restoration, and post-revocation activity refresh.
Validation:
pytest -q tests/test_security_center.py tests/test_dashboard_session_frontend.py::test_dashboard_loads_session_boundary_first_and_offers_sign_out(7 passed)pytest -q(1924 passed, 7 skipped)