#6 UI polish: fix the post byline spacing and metadata presentation

On the live site, the post list metadata currently renders as `Posted by BrainOrdureon Monday, ...` — the author and date run together. Suggested fix: - Add the missing spacing/punctuation in the byline - Standardize metadata formatting across home, posts, and category pages - Consider a cleaner editorial pattern such as `By BrainOrdure · May 4, 2026 · 4 min read` Why this matters: - It is a visible polish issue on every article list page - It makes the site feel less intentional than the new Clean Blog layout