fix fresh install hang: split AGS into own module, remove obsolete packages

- 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)

lib/utils.sh

@@ -97,11 +97,6 @@ is_package_installed() {
         { for (i=2; i<=NF; i++) if ($i == pkg) {found=1; exit} }
         END {exit !found}
       ' && return 0
-    else
-      while IFS= read -r installed; do
-        [[ -z "$installed" ]] && continue
-        pacman -Qi "$installed" 2>/dev/null | grep -qP "Provides\s*:\s*.*\b${pkg}\b" && return 0
-      done < <(pacman -Qq 2>/dev/null)
     fi
     return 1
   fi
@@ -145,21 +140,23 @@ install_aur() {
     return 1
   fi
 
-  local to_install=()
   local pkg
+  local rc=0
 
   for pkg in "${packages[@]}"; do
-    if ! is_package_installed "$pkg"; then
-      to_install+=("$pkg")
+    if is_package_installed "$pkg"; then
+      continue
+    fi
+    tui_info "Installing $pkg from AUR..."
+    if "$aur_helper" -S --needed --noconfirm "$pkg"; then
+      tui_success "$pkg installed"
+    else
+      tui_warn "$pkg could not be installed"
+      rc=1
     fi
   done
 
-  if ((${#to_install[@]})); then
-    log_info "Installing from AUR: ${to_install[*]}"
-    "$aur_helper" -S --needed --noconfirm "${to_install[@]}"
-  else
-    log_info "All AUR packages already installed"
-  fi
+  return $rc
 }
 
 replace_home_paths() {