What we've shipped, when.

Added

• Account settings at /account/settings: change display name, change password, change email (with confirmation link).
• Delete-account flow with password + email confirmation — covers GDPR-style erasure.
• Instructor onboarding tour (six role-specific steps on first visit to /instructor).
• Stripe billing portal reachable directly from account settings for paid users.
• Public /api/health endpoint reporting database, Resend, and Stripe connectivity.
• Composite database indexes for hot-path student and instructor queries.
• Sentry integration for swallowed-catch errors across Stripe webhook, registration, email flows.
• Instructor gradebook CSV now includes a UTF-8 BOM so Excel opens it cleanly.

Improved

• Dark-mode contrast across status badges, error text, danger buttons, and the footer.
• Mobile navigation drawer uses a solid background so menu items read clearly over scrolled content.
• Stripe webhook is resilient to out-of-order events and accounts deleted between checkout and webhook arrival.
• Onboarding now persists your answers and blocks Next on required selections.

Security

• Email change confirmation uses HMAC-signed, time-limited tokens (no DB state).
• APP_SECRET is now required at startup in production.

Improved

• Anonymous lesson and unit content is cached for 10 minutes with tag-based invalidation.
• Pricing page is statically renderable for faster cold starts.
• Voice pass across catalog, instructor pages, dashboards, and transactional emails — precise, no jargon, friendly.
• Brand color tokens now use color-mix so tints stay accurate in dark mode.
• Defensive server-side paywall enforcement with visible lock badges on unit pages.

Fixed

• Save-status banner now handles 403 (paywall) and 429 (rate limit) with actionable copy.
• Dashboard queries parallelized to cut time to interactive.

Added

• System-aware dark mode via prefers-color-scheme.
• Self-hosted Fraunces and Inter via next/font for consistent typography.
• /demo page with the Venn motif, proof tree, truth table, and tier ladder illustrations.
• Keyboard shortcuts help overlay.
• Vercel Web Analytics wired in.
• Trust signals, FAQ schema, breadcrumb schema, Course JSON-LD.
• Sitemap, robots.txt, Open Graph and Twitter card metadata.

Improved

• Lesson-level paywall: free tier = foundations + first lesson of each other unit.
• Instructor dashboard scoped to only the courses you teach (FERPA).
• Home hero and auth page tuned for cold traffic.
• Error recovery UX on error.tsx and global-error.tsx.
• 404 page copy and layout.

Added

• Eight reasoning domains live: foundations, propositional logic, categorical logic, fallacies, inductive, abductive, Bayesian, predicate logic, problem-solving.
• Evaluation engine with deterministic rubric scoring, optional AI rewriting of strengths/weaknesses.
• Diagnostic, spaced-repetition review queue, adaptive recommendations.
• Instructor track with courses, assignments, rosters, and gradebook CSV export.
• Stripe-backed Pro and Team plans.