One React/Vite codebase can power a GitHub Pages site, an installed PWA, an edge-hosted deployment, and a Tauri desktop app. That does not make those surfaces interchangeable. This distinction matters whenever an application handles user projects, offline behavior, AI providers, filesystem access, or security policy. Shared components are valuable. Shared assumptions can be dangerous. WorldScript Studio is a useful case study because its React/Vite application is intentionally availab...