fix(sat): changing satellite mid-pass moves the radio to it

Two birds are often up at once, and switching between them left the frequencies
on the first. The selection on the page is the DISPLAY's; the tracker held its
own name and went on following whatever it was started with. The way through was
to stop tracking and start it again, which is how it was found — and which is
also how a Flex throws away and rebuilds both its slices for no reason.

RetargetSatelliteTracking changes what is being followed without letting go of
the radio or the rotator. Everything derived from the old satellite is cleared so
the next step sets it afresh: the frequencies, the mode on both slices (set once
per satellite, not per tick), the antennas and the CTCSS tone — the new bird may
be U/V where the old one was V/U, which swaps which slice sits on which band.

And it happens at once rather than at the next tick. The loop gained a wake
channel: a second of the previous satellite's frequencies is a second of the
wrong pass, and the antenna would otherwise wait for the new bird to drift a
step away from where the old one happened to be.

Selecting a satellite with the radio idle is unchanged — a look, not a command.

Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>

frontend/wailsjs/go/main/App.js

@@ -2022,6 +2022,10 @@ export function RestartQSORecorder() {
   return window['go']['main']['App']['RestartQSORecorder']();
 }
 
+export function RetargetSatelliteTracking(arg1, arg2) {
+  return window['go']['main']['App']['RetargetSatelliteTracking'](arg1, arg2);
+}
+
 export function RetryOfflineSync() {
   return window['go']['main']['App']['RetryOfflineSync']();
 }