fix: the Flex panel DAX button now toggles the TRANSMIT-bar DAX (transmit set dax=), not the slice RX DAX channel — this is the button that routes TX audio through DAX (WSJT-X); state follows changes made in SmartSDR too

frontend/wailsjs/go/main/App.d.ts

@@ -300,6 +300,8 @@ export function FlexSetSplit(arg1:boolean):Promise<void>;
 
 export function FlexSetTXAntenna(arg1:string):Promise<void>;
 
+export function FlexSetTXDAX(arg1:boolean):Promise<void>;
+
 export function FlexSetTXFilter(arg1:number,arg2:number):Promise<void>;
 
 export function FlexSetTXSlice(arg1:number):Promise<void>;