icon cannot be an emoji; it must be a base64-encoded image

[nick1udwig]

hyperapp-skeleton/skeleton-app/src/lib.rs

Line 71 in 4c29aa9

add_to_homepage("Skeleton App", Some("🦴"), Some("/"), None);

see e.g. https://book.hyperware.ai/my_first_app/chapter_4.html?highlight=icon#adding-a-homepage-icon-and-widget