feat: sync the host CW keyer speed (wkWpm) to the FlexRadio's actual CW speed — including changes made on the radio/SmartSDR, not just the panel slider — so CW-length estimates (auto-call gap) match reality when using Flex CWX

frontend/src/App.tsx

@@ -3675,7 +3675,7 @@ export default function App() {
       case 'flex':
         return (
           <div className="h-full w-full min-h-0 rounded-lg overflow-hidden border border-border">
-            <FlexPanel onCWSpeed={(w) => { setWkWpm(w); WinkeyerSetSpeed(w).catch(() => {}); saveWk({ wpm: w }); }}
+            <FlexPanel onCWSpeed={(w) => { if (cwSourceRef.current === 'flex') setWkWpm(w); }}
               onReportRST={(r) => { setRstSent(r); rstUserEditedRef.current = true; }} />
           </div>
         );
@@ -4993,7 +4993,7 @@ export default function App() {
                 backend is a FlexRadio. */}
             {catState.backend === 'flex' && (
               <TabsContent value="flex" className="flex-1 min-h-0 p-0">
-                <FlexPanel onCWSpeed={(w) => { setWkWpm(w); WinkeyerSetSpeed(w).catch(() => {}); saveWk({ wpm: w }); }}
+                <FlexPanel onCWSpeed={(w) => { if (cwSourceRef.current === 'flex') setWkWpm(w); }}
               onReportRST={(r) => { setRstSent(r); rstUserEditedRef.current = true; }} />
               </TabsContent>
             )}