MosqueOS/Mosque-Prayer-Display-Screen ? reverse-engineered prompt

Build me a mosque prayer times display web app that can run on a TV screen and also work as an offline progressive web app in a normal browser.

I want the main screen to show today’s prayer times clearly in a full HD layout, with a clean mosque friendly design, and an option to hide tomorrow’s prayer time if needed. It should also support announcements that can be shown on the screen, plus a simple admin page that someone can use from their phone to manage those announcements. If it makes sense, include a small embeddable widget version too, so the prayer time display can be added to a mosque website.

The app should be easy to deploy, use environment settings for the mosque data source, and be set up so each mosque can connect its own prayer times spreadsheet or data feed. Please make the experience polished, readable from far away, and reliable if the internet drops. If you need to check current docs or best practices for anything, go ahead and look them up online.