Introduce instanceStore (Zustand) with full federation lifecycle:
probe remote instances, register with username collision fallback,
login to existing accounts, sync instance list across all connected
instances, auto-reconnect from cached tokens on login/page load, and
cleanup on logout. Add ConnectedInstances component to User Settings
with home instance card, remote instance management, and inline
add-instance flow (URL probe → register/login → connected).
Jannis Braun
ef7aa3ff5a