v1.3.0

What's New

• Tufte Hero margin figure: New "Tufte Hero" block style variation on core/post-featured-image that positions the featured image in the right margin alongside the post title and metadata — a classic Tufte margin figure layout.
• Restructured single post template: <main> uses constrained left-justified layout with a wide hero group wrapping title, metadata, and featured image.
• Responsive breakpoint: Margin figure displays at 1200px+ viewports; stacks below the title on narrower screens.