Add screenshot and ntfy plugins; update keybinds

Disable the notify-client module on all hosts. Install hyprshot, enable
screenshot and ntfy‑notifications plugins, set screenshot mode to
region,
and add keybindings for these features. Introduce a restart‑noctalia
script and include it in the home scripts.

modules/core/packages/essentials.nix

@@ -44,6 +44,7 @@
     waypaper
     uwsm
     hyprpicker
+    hyprshot
     cliphist
     # Development utilities
     pkg-config