UI tweaks (#14088)

* fix squashed alert thumbnails in filmstrip

* add genai debug logs

* consistent themed image loading indicator background color

* improve image loading skeleton in object lifecycle pane

* less rounding when screen is smaller

* use browser back button to dismiss review pane

* initial state

web/src/components/indicators/ImageLoadingIndicator.tsx

@@ -14,7 +14,7 @@ export default function ImageLoadingIndicator({
   }
 
   return isSafari ? (
-    <div className={cn("pointer-events-none bg-gray-300", className)} />
+    <div className={cn("pointer-events-none bg-background_alt", className)} />
   ) : (
     <Skeleton className={cn("pointer-events-none", className)} />
   );