Update grid layout, refetch interval, and image handling

Adjusted the grid column behavior for medium screens in event themes and commented out unused badge rendering. Updated the image uploader to handle `existingImage` using the server URL and added debugging output. Modified the event theme context to use a fixed refetch interval of 60 seconds.

frontend/src/app/(main)/dashboard/event-themes/page.tsx

@@ -61,7 +61,7 @@ export default function EventThemesPage() {
       )}
 
       {!isLoadingThemes && themes && themes.length > 0 && (
-        <div className="grid gap-6 sm:grid-cols-2 md:grid-cols-3 lg:grid-cols-4">
+        <div className="grid gap-6 sm:grid-cols-2 md:grid-cols-2 lg:grid-cols-4">
           {themes.map((theme) => (
             <Card
               key={theme.id}
@@ -88,14 +88,14 @@ export default function EventThemesPage() {
                 </CardDescription>
               </CardContent>
               <CardFooter className="flex flex-col gap-2 p-4 border-t border-gray-200 dark:border-gray-700">
-                <div className="flex gap-2">
-                  {theme.background_image_url && (
-                    <Badge>Background Image</Badge>
-                  )}
-                  {theme.foreground_image_url && (
-                    <Badge>Foreground Image</Badge>
-                  )}
-                </div>
+                {/*<div className="flex gap-2">*/}
+                {/*  {theme.background_image_url && (*/}
+                {/*    <Badge>Background Image</Badge>*/}
+                {/*  )}*/}
+                {/*  {theme.foreground_image_url && (*/}
+                {/*    <Badge>Foreground Image</Badge>*/}
+                {/*  )}*/}
+                {/*</div>*/}
                 <Button variant="outline" size="sm" asChild className="w-full">
                   <Link href={`/dashboard/event-themes/${theme.id}/edit`}>
                     Edit Theme

frontend/src/components/ui/image-uploader.tsx

@@ -99,7 +99,11 @@ export function ImageUploader({
     fileInputRef.current?.click();
   };
   // Determine the current image to display
-  const currentImage = getServerFileUrl(fileUrl) || preview || existingImage;
+  const currentImage =
+    getServerFileUrl(fileUrl) ||
+    preview ||
+    getServerFileUrl(existingImage || undefined);
+  console.log("currentImage", currentImage);
   // const currentImage = preview || existingImage;
   return (
     <div className={`w-full space-y-2 ${className}`}>

frontend/src/context/event-theme-context.tsx

@@ -98,7 +98,7 @@ export const EventThemesProvider: React.FC<EventThemesProviderProps> = ({
   } = useQuery({
     ...listEventThemesOptions(),
     refetchOnWindowFocus: "always",
-    refetchIntervalInBackground: true,
+    refetchInterval: 60000,
   });
 
   // Fetch specific theme