Replace display:none/flex slide toggling with CSS grid stacking so all
slides always occupy the same layout cell. The container height is now
fixed at the tallest image height — no more text jumping below the
carousel as slides change. Also enables the existing opacity fade
transition which was previously blocked by display:none.
Affects: index.html, articles/why-we-built-hoa-ledgeriq.html,
articles/hoa-financial-blind-spots.html, and all future articles.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
