Ports the DaemonLink state machine from web/src/components/daemon/DaemonLink.tsx
and crates/maestro-tui/src/daemon_link.rs to Android: LinkState (Connecting,
Online, Reconnecting, Down, Updating), build-stamp identity comparison, a
session catalog folded from the events WebSocket, and exponential backoff
(500ms-10s) in place of the flat poll the LAN clients use, since a phone's
network changes are bigger and longer-lived than a wifi blip.
DaemonLink reacts to ProcessLifecycleOwner (foreground resume) and
ConnectivityManager (network change) to re-probe and reconnect. DaemonPrefs
persists the daemon base URL via SharedPreferences and exposes an intent
extra key for overriding it at launch.