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* improvement(landing): optimize core web vitals and accessibility Code-split AuthModal and DemoRequestModal via next/dynamic across 7 landing components to move auth-client bundle (~150-250KB) out of the initial JS payload. Replace useSession import in navbar with direct SessionContext read to avoid pulling the entire better-auth client into the landing page bundle. Add immutable cache header for content-hashed _next/static assets. Defer PostHog session recording until user identification to avoid loading the recorder (~80KB) on anonymous visits. Fix accessibility issues flagged by Lighthouse: add missing aria-label on preview submit button, add inert to aria-hidden ReactFlow wrapper, set decorative alt on logos inside labeled links, disambiguate duplicate footer API links. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * fix(posthog): guard startSessionRecording against repeated calls on refetch The effect fires on every session reload (e.g., subscription upgrade). Calling startSessionRecording() while already recording fragments the session in the analytics dashboard. Add sessionRecordingStarted() guard so recording only starts once per page lifecycle. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * fix(config): remove redundant _next/static cache header Next.js already sets Cache-Control: public, max-age=31536000, immutable on _next/static assets natively and this cannot be overridden. The custom rule was redundant on Vercel and conflicted with the extension-based rule on self-hosted deployments due to last-match-wins ordering. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>