fix: Improve blog tag contrast - change from blue on blue to neutral colors

Changed blog post tags from blue background with blue text to neutral
background with primary text color for better readability and accessibility.

Before: bg-[var(--primary)] bg-opacity-10 text-[var(--primary)]
After: bg-[var(--border)] text-[var(--text-primary)]

Fixes blue-on-blue contrast issue reported by user.

Author: GeneAI

website/app/blog/[slug]/page.tsx

@@ -90,7 +90,7 @@ export default async function BlogPostPage({ params }: PageProps) {
                   {post.tags.map((tag) => (
                     <span
                       key={tag}
-                      className="px-3 py-1 bg-[var(--primary)] bg-opacity-10 text-[var(--primary)] rounded-full text-sm font-semibold"
+                      className="px-3 py-1 bg-[var(--border)] text-[var(--text-primary)] rounded-full text-sm font-semibold"
                     >
                       {tag}
                     </span>