The AUR package aylurs-gtk-shell depends on libastal and libastal-4
which no longer exist in AUR. Only the -git variants exist.
The -git version (aylurs-gtk-shell-git) correctly depends on
libastal-git and libastal-4-git.
- Remove slow fallback loop from is_package_installed (only use expac)
- Move aylurs-gtk-shell from hyprland group to dedicated core/ags module
with clear progress warning and user confirmation before build
- Install AUR packages one at a time in install_aur (better error isolation)
- Replace obsolete ttf-font-awesome with otf-font-awesome
- Remove p7zip (deleted from repos and AUR)
