feat+fix batch: Station Control dashboard (fixed-width panels, grip-handle drag reorder, amp meters from the Flex stream, compact relays), Ultrabeam element list capped to 3 (READ_BANDS over-read), spot-click on Flex panadapter now sets mode, DAX TX toggle, DVK panel state persists across relaunch, duplicate amp meters cleared on power-cycle, QSO audio recording snapshot taken synchronously at log time (was racing the form-clear cancel), Flex COMP meter max -20->-25 and MIC scale to 0; changelog 0.20.10

frontend/src/App.tsx

@@ -950,7 +950,10 @@ export default function App() {
   const [contestTabEnabled, setContestTabEnabled] = useState(() => localStorage.getItem('opslog.contestTab') === '1');
   useEffect(() => { localStorage.setItem('opslog.contestTab', contestTabEnabled ? '1' : '0'); }, [contestTabEnabled]);
 
-  const [dvkEnabled, setDvkEnabled] = useState(false);
+  // DVK panel open/closed — persisted like the other Tools toggles above so it
+  // survives a relaunch instead of resetting to closed.
+  const [dvkEnabled, setDvkEnabled] = useState(() => localStorage.getItem('opslog.dvkEnabled') === '1');
+  useEffect(() => { localStorage.setItem('opslog.dvkEnabled', dvkEnabled ? '1' : '0'); }, [dvkEnabled]);
   const [dvkMsgs, setDvkMsgs] = useState<DVKMsg[]>([]);
   const [dvkStat, setDvkStat] = useState<DVKStat>({ recording: false, playing: false, rec_slot: 0 });
   const dvkActiveRef = useRef(false);