PWA behavior

The web app is designed to behave like an installable product, not only a website.

Installation, caching, and app-shell behavior are part of the product scope from the beginning.

Install surface

The public and learner shells both need explicit installation guidance.

Explain how to install on Android, iPhone, tablet, and desktop.

The app shell should remain useful even before full offline packs exist.

Prayer and review reminders should be requested at the right moment, not at first paint.