Add Noctalia shell with Quickshell overview

- Add `noctalia` input to flake and lock it in `flake.lock`.
- Include `noctalia` and `quickshell` modules in `flake.nix`.
- Extend core packages to accept `inputs` and `system`; add
  `quickshell.nix`
  with required Qt6 packages and environment variables.
- Enable `upower` service for battery handling.
- Add home modules `noctalia.nix` and `overview.nix` (QML UI, README,
  assets, widgets, services) to provide a workspace overview.
- Comment out unused rofi and web‑search binds; update `exec‑once` to
  start
  the overview daemon and `noctalia-shell`.
- Provide `restart.noctalia` script and its Nix wrapper.
- Enable `noctalia-shell` in `stylix` configuration.

modules/home/default.nix

@@ -29,8 +29,10 @@ in {
     ./kdeConnect.nix
     ./lutris.nix
     ./nextcloud.nix
+    ./noctalia.nix
     ./obs-studio.nix
     ./onlyoffice.nix
+    ./overview.nix
     ./qt.nix
     ./ssh.nix
     ./starship.nix