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.js

@@ -250,6 +250,10 @@ export function DownloadAllReferenceLists() {
   return window['go']['main']['App']['DownloadAllReferenceLists']();
 }
 
+export function DownloadAndApplyUpdate(arg1) {
+  return window['go']['main']['App']['DownloadAndApplyUpdate'](arg1);
+}
+
 export function DownloadClublogCty() {
   return window['go']['main']['App']['DownloadClublogCty']();
 }
@@ -1050,6 +1054,10 @@ export function ListUDPIntegrations() {
   return window['go']['main']['App']['ListUDPIntegrations']();
 }
 
+export function LiveLastQSOAgeSec() {
+  return window['go']['main']['App']['LiveLastQSOAgeSec']();
+}
+
 export function LoTWUserInfo(arg1) {
   return window['go']['main']['App']['LoTWUserInfo'](arg1);
 }