chore: address review feedback — delete dead Cloudinary components, add LQIP TODO, document video URL format

- Delete unused cloudinary-image.tsx and cloudinary-video.tsx
- Add TODO comment for LQIP blur placeholder support in cover-image.tsx
- Add explanatory comment for Sanity file ref URL construction in cover-video.tsx

Co-authored-by: builder <builder@miriad.systems>

Author: Miriad

components/cloudinary-image.tsx

@@ -17,6 +17,10 @@ export default function CoverImage(props: CoverImageProps) {
         ? urlForImage(image)?.width(width || 1920).height(height || 1080).quality(quality || 80).url()
         : null;
 
+    // TODO: Add LQIP blur placeholder for progressive loading. Options:
+    // 1. Query Sanity for lqip metadata: image.asset->metadata.lqip
+    // 2. Use a tiny base64 placeholder generated at build time
+
     if (!imageUrl) {
         return (
             <div className="transition-shadow duration-200 shadow-md group-hover:shadow-lg sm:mx-0">

components/cloudinary-video.tsx

@@ -18,8 +18,8 @@ export default function CoverVideo(props: CoverVideoProps) {
         );
     }
 
-    // Convert file-{hash}-{ext} to URL
-    // file-abc123-mp4 -> https://cdn.sanity.io/files/{projectId}/{dataset}/abc123.mp4
+    // Sanity file asset references follow the format: file-{id}-{extension}
+    // e.g., "file-abc123def456-mp4" → https://cdn.sanity.io/files/{projectId}/{dataset}/abc123def456.mp4
     const parts = assetRef.split('-');
     const ext = parts.pop();
     const hash = parts.slice(1).join('-');