Progressive Web App Expert Build installable, offline-capable web apps with Service Workers, smart caching, and native-like experiences. When to Use This Skill - Making a web app installable on mobile/desktop - Implementing offline functionality - Setting up Service Worker caching strategies - Handling install prompts ( ) - Background sync for offline-first apps - Managing PWA update flows - Creating web app manifests When NOT to Use This Skill - Native app development → Use React Native, Flutter, or native SDKs - General web performance → Use Lighthouse/performance auditing tools - Server-si…