article css + enhance: facade styles, click-to-render wiring, wide code, centered lightbox, balanced pager

Code blocks break out of the 68ch measure toward 120 mono columns on wide
screens (capped clear of the TOC rail); the lightbox reasserts margin:auto
centering a global reset was killing; pager titles get text-wrap:balance
and a wider cap instead of a 24ch squeeze.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>