Enhancement: Author profile cards with images and bios

[MarkOnFire]

Summary

Add author profile cards that display author images and bios in two locations:

1. Author archive pages (author.hbs)

The current author page shows a basic header. Enhance it with:

• Author profile image (from Ghost admin)
• Author bio text
• Social links (if configured)
• Styled consistently with the Wonder Cabinet brand

2. Episode post pages (post.hbs)

Add an author card at the bottom of episode posts (below episode notes, above comments/CTA) showing:

• Author profile image
• Author name (linked to author archive)
• Author bio
• Works for single and multi-author posts

Context

The no-audio post layout already includes a byline via {{authors separator=" & "}} in the post-header partial. This enhancement would extend author attribution to all posts with a richer visual treatment, and improve the author archive pages.

Implementation Notes

• Ghost provides {{primary_author.profile_image}}, {{primary_author.bio}}, {{primary_author.website}}, etc.
• For multi-author, iterate with {{#foreach authors}}...{{/foreach}}
• Consider a reusable partials/components/author-card.hbs partial for both locations
• Style with black background, cream text, green accents per brand guide

Acceptance Criteria

• Author archive pages display profile image and bio
• Episode posts show author card(s) below content
• Multi-author posts display all authors
• Mobile responsive at 767px breakpoint
• Follows Wonder Cabinet brand system (Jost headings, EB Garamond body, brand colors)