Persist lightbox settings (#2406)

* Persist lightbox settings in local forage
* Add lightbox settings to backend
* Add lightbox settings to interface settings page

internal/api/resolver_query_configuration.go

@@ -140,9 +140,9 @@ func makeConfigInterfaceResult() *models.ConfigInterfaceResult {
 	css := config.GetCSS()
 	cssEnabled := config.GetCSSEnabled()
 	language := config.GetLanguage()
-	slideshowDelay := config.GetSlideshowDelay()
 	handyKey := config.GetHandyKey()
 	scriptOffset := config.GetFunscriptOffset()
+	imageLightboxOptions := config.GetImageLightboxOptions()
 
 	// FIXME - misnamed output field means we have redundant fields
 	disableDropdownCreate := config.GetDisableDropdownCreate()
@@ -163,7 +163,8 @@ func makeConfigInterfaceResult() *models.ConfigInterfaceResult {
 		CSS:                          &css,
 		CSSEnabled:                   &cssEnabled,
 		Language:                     &language,
-		SlideshowDelay:               &slideshowDelay,
+
+		ImageLightbox: &imageLightboxOptions,
 
 		// FIXME - see above
 		DisabledDropdownCreate: disableDropdownCreate,