feat(motor antenna): amber at the order, not at the answer

The transmit gag starts when the move is commanded; the indicator waited
for a status poll to say the elements were travelling, so the two
disagreed by a second or more — and on an automatic follow (band change
with tracking on) there was no sign at all until a poll landed. The
backend now announces the order as it goes out, the interface shows it at
once and re-reads the antenna immediately, and the real status takes over
the moment it arrives.

The WSJT-X "grey out stations already worked" switch is renamed "Mark
stations already worked": with the colour now chosen by the operator the
old name described the wrong thing, but the switch still answers a
question the palette cannot — WHETHER dupes should be marked at all. On a
well-filled log they are most of a period, and a window where nearly
every line is coloured has stopped saying anything.

frontend/src/App.tsx

@@ -3100,6 +3100,12 @@ export default function App() {
   const pokeUbStatus = useCallback(async () => {
     try { const s: any = await GetUltrabeamStatus(); if (s) setUbStatus(s); } catch { /* transient */ }
   }, []);
+  // A move was just ORDERED — from a button here or by the follow loop on a
+  // band change. Held for as long as it takes the antenna to answer, and no
+  // longer: the real status takes over the moment it arrives.
+  const [motorCmdAt, setMotorCmdAt] = useState(0);
+  const motorMoving = !!ubStatus.moving || (motorCmdAt > 0 && Date.now() - motorCmdAt < 2500);
+
   // Three seconds while it sits still, half a second while it moves.
   //
   // The moving flag gags the transmitter, and this poll is the last of three
@@ -3113,9 +3119,24 @@ export default function App() {
       try { const s: any = await GetUltrabeamStatus(); if (alive) setUbStatus(s); } catch {}
     };
     tick();
-    const id = window.setInterval(tick, ubStatus.moving ? 500 : 3000);
+    const id = window.setInterval(tick, motorMoving ? 400 : 3000);
     return () => { alive = false; window.clearInterval(id); };
-  }, [ubStatus.moving]);
+  }, [motorMoving]);
+
+  // The backend says it at the instant the order goes out — see
+  // noteMotorMoveCommanded. Read at once as well, so the antenna's own answer
+  // replaces the assumption as soon as there is one.
+  useEffect(() => {
+    const off = EventsOn('motorant:move', () => {
+      setMotorCmdAt(Date.now());
+      pokeUbStatus();
+      window.setTimeout(pokeUbStatus, 350);
+      // And once the window is over, so "assumed moving" stops being assumed
+      // even if nothing else re-renders.
+      window.setTimeout(() => setMotorCmdAt((v) => (Date.now() - v >= 2500 ? 0 : v)), 2600);
+    });
+    return () => { off?.(); };
+  }, [pokeUbStatus]);
 
   // Poll the Antenna Genius switch for active antenna per port + the list.
   // Re-read the enabled flag each tick so toggling it in Settings makes the
@@ -6859,9 +6880,9 @@ export default function App() {
             {/* Motorized-antenna pattern (Normal / 180° reverse / Bidirectional), next to the azimuth. */}
             {ubStatus.enabled && (
               <div className="inline-flex items-center rounded-full border border-success-border bg-success-muted overflow-hidden text-[10px] font-semibold ml-1"
-                title={ubStatus.connected ? (ubStatus.moving ? 'Antenna: moving…' : 'Antenna pattern') : 'Antenna: connecting…'}>
+                title={ubStatus.connected ? (motorMoving ? 'Antenna: moving…' : 'Antenna pattern') : 'Antenna: connecting…'}>
                 <button type="button" className="pl-1.5 pr-0.5 flex items-center" onClick={() => { setSettingsSection('antenna'); setShowSettings(true); }} title="Antenna settings">
-                  <span className={cn('size-2 rounded-full', ubStatus.connected ? (ubStatus.moving ? 'bg-warning' : 'bg-success') : 'bg-muted-foreground/40')} />
+                  <span className={cn('size-2 rounded-full', ubStatus.connected ? (motorMoving ? 'bg-warning' : 'bg-success') : 'bg-muted-foreground/40')} />
                 </button>
                 {([{ d: 0, l: 'N', t: 'Normal' }, { d: 1, l: '180°', t: 'Reverse (180°)' }, { d: 2, l: 'Bi', t: 'Bidirectional' }]).map((o) => (
                   <button key={o.d} type="button" disabled={!ubStatus.connected} title={o.t}
@@ -6958,8 +6979,8 @@ export default function App() {
                 {/* Amber while the elements travel: on a SteppIR that is also
                     when transmitting is a bad idea, so it is worth seeing from
                     the icon without opening the widget. */}
-                {ubStatus.moving && <span className="absolute -top-0.5 -right-0.5 size-2 rounded-full bg-warning animate-pulse" />}
-                {!ubStatus.moving && showMotorAnt && ubStatus.connected && <span className="absolute -top-0.5 -right-0.5 size-2 rounded-full bg-success" />}
+                {motorMoving && <span className="absolute -top-0.5 -right-0.5 size-2 rounded-full bg-warning animate-pulse" />}
+                {!motorMoving && showMotorAnt && ubStatus.connected && <span className="absolute -top-0.5 -right-0.5 size-2 rounded-full bg-success" />}
               </button>
             )}
             {agEnabled && (
@@ -7762,7 +7783,7 @@ export default function App() {
           {showMotorAnt && ubStatus.enabled && (
             <div className="w-[230px] shrink-0 min-h-0" style={{ order: wOrder('motorant') }}>
               <MotorAntennaWidget
-                ant={ubStatus}
+                ant={{ ...ubStatus, moving: motorMoving }}
                 refetch={pokeUbStatus}
                 t={t}
                 essentialsOnly