TL;DR — I just shipped The Wanting Mind, a 147,000-word interactive book that reads like Wikipedia + a podcast + a graph. It's free, no signup, all four languages (EN/JA/ZH/TH). The whole thing is a React 19 SPA backed by Supabase, Capacitor for the mobile apps, and a chunk of AI (ElevenLabs for narration, fal.ai for chapter art, Gemini for video, Claude for translation). This post is what worked