Tour: compact uniform tiles, centered content (fix layout)

Tour: gestures tile + merged tile; fix card spacing/highlight

Pre-render ⓘ tour audio (FIXED_LINES + startup prefetch)

Add 'What makes Pip special' tour (info button on splash)

Ship 'Today I Learned' certificate + link traces dataset

Redesign a11y pass: WCAG-safe button labels + chip/eyebrow/muted contrast + fuller reduced-motion + polish

Redesign: 'A Window of Wonders' — Fraunces/Nunito, dawn-to-dusk palette, Pip's twilight window, storybook cards

Fix autoplay state-machine bugs from review (stuck asking, paused-quiz audio, mic leak, token guard)

Auto-play lesson flow: hands-free auto-advance + tap-to-ask (silence detect) + Pause/Skip

Add 5 new kids lessons (butterfly, bees, five senses, shapes, magnets) + sticker names

Speed: frontend audio prefetch + in-memory buffer cache (instant per-line playback)

Speed: cache + pre-record lesson audio (instant playback) + optional KEEP_WARM

Engagement upgrade: alive Pip celebrations + Sticker Book + Web-Audio SFX (A·C·D)

Professor Pip — kids learning avatar (courses, make-your-own, safety gate, browser lesson engine)