Runtime/toolchain + dependency upgrade baseline (fleet-wide reference)

Elazar fleet directive (relayed via audit-mars-ca): upgrade Mars runtime/toolchain — Next current stable, React/React-DOM 19.2.7, Node 24.x, pin a Vercel-supported pnpm 10; then staged compatible bumps for @supabase/supabase-js, @supabase/ssr, pg, Tailwind, Base UI, Lucide, Sharp, Sass, etc. No blind 'pnpm update --latest'. Isolate + separately evaluate breaking majors (TypeScript 7, ESLint 10, Nodemailer 9, react-zoom-pan-pinch 4) before adopting. This baseline also becomes the reference for Pluto/Venus and the new Enamel project. Touches auth (@supabase/ssr) + email (Nodemailer) subsystem versions -> Class-A pre-implementation audit design-ping required before starting, per evolutiva-commons Push-to-Done.