Polish blog typography

[replakcan]

Description

Improve blog post typography and reading experience.

Scope

• Improve heading styles
• Improve paragraph spacing
• Improve list styling
• Improve code block spacing
• Improve mobile reading experience

Out of Scope

• Blog search
• Comments
• CMS integration
• Major redesign

Acceptance Criteria

• Blog headings are readable
• Paragraph spacing is comfortable
• Lists are readable
• Code blocks fit mobile screens
• Blog detail page feels comfortable to read
• npm run build succeeds

Technical Notes

• Keep typography consistent with the rest of the site.

Related

• Depends on: Build blog detail page
• Related to: Add code block styling for blog posts