v1.6.5

Two new virtual toggle switches that prevent the inverter returning to
self-consumption mode after Force Charging or Force Import completes.

Force Charging Hold: when enabled and the Force Charging duration expires
or the SoC cutoff is reached, instead of resetting dispatch a neutral hold
dispatch (power=32000, mode=SOC Control, soc=cutoff) is sent and refreshed
every 50 seconds. This keeps the inverter in dispatch mode so the battery
cannot discharge. Turn Force Charging off to return to normal operation.

Force Import Hold: when enabled and the Force Import duration expires,
the dispatch refresh loop continues running rather than stopping. Since
the battery is at the cutoff SoC, the inverter naturally holds it there
in SOC Control mode. Turn Force Import off to return to normal operation.

Neither hold switch interacts with Modbus directly - they are flags that
modify the behaviour of their paired main switch at duration expiry.