fix(content): update type field and conditional rendering for content handling

- Changed `type` field values from `image | video` to `meme | gif`.
- Updated conditional rendering in `content-card` component to match new `type` values.

frontend/src/components/content-card.tsx

@@ -95,7 +95,7 @@ export function ContentCard({ content }: ContentCardProps) {
 			</CardHeader>
 			<CardContent className="p-0 relative bg-zinc-100 dark:bg-zinc-900 aspect-square flex items-center justify-center">
 				<Link href={`/meme/${content.slug}`} className="w-full h-full relative">
-					{content.type === "image" ? (
+					{content.type === "meme" ? (
 						<Image
 							src={content.url}
 							alt={content.title}

frontend/src/types/content.ts

@@ -7,7 +7,7 @@ export interface Content {
 	description?: string;
 	url: string;
 	thumbnailUrl?: string;
-	type: "image" | "video";
+	type: "meme" | "gif";
 	mimeType: string;
 	size: number;
 	width?: number;