feat: ON AIR status-bar badge + auto-updater UI (10-min check, progress)

ON AIR badge (bottom status bar, shown when live-status publishing is on): a
blinking red light + "On air" when a QSO was logged in the last 5 min, dim
"Offline" otherwise. Seeded at launch from LiveLastQSOAgeSec so it's right
immediately, flips online on qso:logged, expires via a 10s tick.

Auto-updater UI: the update check now also runs every 10 minutes, and the
update notification downloads and installs in-app — a live progress bar
(update:progress) then OpsLog restarts on the new build. Falls back to opening
the release page when there's no auto-download asset or on error (retry).
Regenerated bindings for DownloadAndApplyUpdate / LiveLastQSOAgeSec.

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

@@ -146,6 +146,8 @@ export function DismissAwardUpdate(arg1:string):Promise<void>;
 
 export function DownloadAllReferenceLists():Promise<string>;
 
+export function DownloadAndApplyUpdate(arg1:string):Promise<void>;
+
 export function DownloadClublogCty():Promise<main.ClublogCtyInfo>;
 
 export function DownloadConfirmations(arg1:string,arg2:boolean,arg3:string):Promise<void>;
@@ -546,6 +548,8 @@ export function ListTQSLStationLocations():Promise<Array<extsvc.StationLocation>
 
 export function ListUDPIntegrations():Promise<Array<udp.Config>>;
 
+export function LiveLastQSOAgeSec():Promise<number>;
+
 export function LoTWUserInfo(arg1:string):Promise<lotwusers.Info>;
 
 export function LogUDPLoggedADIF(arg1:string):Promise<number>;