NE v2.6.1 — React 19 & Hydration Stability

v2.6.1 is a stability-focused patch for the v2.6 generation of Next.js Engine.

This release fixes several React 19 / Next.js 16 issues around SSR hydration, generated Engine CSS, App Router navigation, Overlay portals, route matching, primitive styling, nested interactive markup, and runtime stylesheet behavior.

Highlights include:

• fixed Card/Button/Text style precedence so schema props correctly override primitive defaults;
• hardened Engine-generated CSS against SSR/client ordering mismatches;
• improved Dialog/Drawer/Popover hydration and live scroll-lock behavior;
• fixed reduced-motion hydration differences in EngineScroll;
• improved EngineNav behavior with Next.js rewrites and route-segment matching;
• unified internal Engine links with the Next.js routing pipeline;
• protected against invalid nested interactive/link markup;
• fixed Engine shimmer/keyframe collisions and HMR stylesheet duplication;
• improved React 19 stylesheet/font handling;
• hardened EngineShader hot-reload polling and listener isolation;
• expanded regression coverage for hydration and React/Next-specific failures.

v2.6.1 does not add another major subsystem — it makes the large v2.6.0 Shader + Transitions + Scroll + Overlay update significantly more reliable under real React 19 and Next.js 16 applications.

Full breakdown: docs/release/NE-v2-6-1.md