feat: implement three-width layout system (reading, wide, full-bleed)
Replace the narrow 720px column layout with a three-width breakout system:
- Reading width (--width-prose, 720px): prose paragraphs, lists, blockquotes
- Wide width (--width-code, 840px): code blocks, inline SVGs, figures, .wide/.breakout
- Full width (--width-container, 1100px): hero diagrams, .full elements
The outer container is wide; individual content blocks self-constrain via
max-width + margin: auto. This creates the narrow-wide-narrow rhythm.
Changes:
- prose.css: Add .prose > * breakout pattern for three widths, SVG styling
- BaseLayout.astro: Remove max-width from main (children handle their own widths)
- [...slug].astro: Remove --width-prose constraint from .prose-wrapper
- prose.css: Remove old left:50%/translateX(-50%) code block hack
Ken
eaef3f8e84