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/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;