#9 Article page refinement: strengthen the story header and reading flow

The Clean Blog-inspired article pages are a strong improvement, but they can still feel more polished. Suggested improvements: - Add article metadata under the title (author, date, category, read time) - Make the story width slightly narrower for easier reading - Increase vertical spacing between paragraphs - Add subtle share controls and a better “back to posts” pattern - Make sure the hero image overlay keeps text contrast high on all images Why this matters: - Stronger editorial feel - Better readability on long-form posts - More consistent article presentation across posts with and without images