Add tunnel_status command to desktop client for querying active tunnel state. Add is_active method to tunnel_manager that calls status command on bundled backend. Add status command to tunnel-helper that checks WireGuard service state on Windows via sc query and interface state on macOS via wg show. Add windows_client_status function for IPC-based status queries with active field in TunnelResponse. Update App.tsx to query tunnel status on
nessi
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