A SteppIR only covers part of the spectrum (a standard one is 20 m–6 m) but
can't report its own range, so the follow loop's existing out-of-range guard
(FreqMin/FreqMax) never engaged for it. Tuning the rig to a band the antenna
can't reach (e.g. 30 m) made the loop keep trying — the immediate cause of the
stuck TX interlock addressed in the previous commit.
Add a Tunable range (MHz) setting to the Antenna panel, wired into the SteppIR
adapter's Status().FreqMin/FreqMax so the follow loop skips out-of-range
frequencies entirely: no tune command, no TX inhibit. Defaults to 13–54 MHz
(20 m–6 m, the common model) when unset; widen the low edge for a 40 m-equipped
SteppIR. Ultrabeam is unaffected (it reports its own per-band coverage).
Keeps the last-commanded-freq deadband from the previous commit as a universal
safety net for any flaky-status case within the valid range.
rouggy
48345a22fc