Fix #625: Allow customization of grid card size

backend/app.go

@@ -36,6 +36,8 @@ const (
 var (
 	ErrNoServers       = errors.New("no servers set up")
 	ErrAnotherInstance = errors.New("another instance is running")
+
+	appInstance *App
 )
 
 type App struct {
@@ -204,9 +206,14 @@ func StartupApp(appName, displayAppName, appVersion, appVersionTag, latestReleas
 
 	a.startConfigWriter(a.bgrndCtx)
 
+	appInstance = a
 	return a, nil
 }
 
+func AppInstance() *App {
+	return appInstance
+}
+
 func (a *App) IsFirstLaunch() bool {
 	return a.isFirstLaunch
 }