Refactor Waybar config and CSS: add rgb/radius helpers and tweak
sizes, spacing, colors, tooltips, icons and transitions
Enable gtk-layer-shell and reload-on-change. Move exec-once into
settings and adjust modules and workspaces formatting
Add blueman and bluez to basic apps for Bluetooth support
Add elephant to home packages and add a systemd user service for
walker; change Hyprland exec-once to enable and start elephant.service
Remove caelestia-shell/cli inputs and prune corresponding flake.lock
entries. Update Hyprland keybindings to use walker, grimblast and
Waybar, use loginctl for locking and pkill/waybar for restart. Add
new home/system modules for waybar and walker and enable them in
host configs. Delete obsolete INSTALL-laptop.md.
kptltd00m