Docs: Add YouTube video walkthrough link to README

Docs: Update all live links to include fullscreen param

Docs: Update README banners to include UI screenshot and Studio logo

Polish: Fix print functionality, add printer icon, and update assets

docs: Update demo link to fullsceen & add Try Now badge

chore: Expand .gitignore for secrets and privacy protection

feat: Focus Falls - more engaging colorful animation

fix: Update instructions to reflect auto-send flow - stop recording auto-submits

feat: Focus Falls - add timer, age-adaptive duration, start/submit flow

fix: Remove all assessment/detection language from user-facing messaging

fix: Make Learn More button functional - opens Terms of Service

fix: Update contact support email to author's email

feat: Add animated focus activity for Focus Falls (replaces placeholder video)

fix: UI layout - prevent instruction panel from overlapping character

docs: Add LICENSE and CONTRIBUTING.md files