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/scripts/restart.noctalia.nix

@@ -0,0 +1,24 @@
+{pkgs, ...}: let
+  binPath = pkgs.lib.makeBinPath [
+    pkgs.coreutils
+    pkgs.procps
+    pkgs.psmisc
+    pkgs.gnugrep
+    pkgs.findutils
+    pkgs.util-linux
+    pkgs.bash
+  ];
+  script = builtins.readFile ./restart.noctalia;
+in
+  pkgs.writeShellScriptBin "restart.noctalia" ''
+      set -euo pipefail
+      export PATH=${binPath}:$PATH
+
+      tmp_script=$(mktemp)
+      trap 'rm -f "$tmp_script"' EXIT
+      cat > "$tmp_script" <<'BASH_EOF'
+    ${script}
+    BASH_EOF
+      chmod +x "$tmp_script"
+      exec ${pkgs.bash}/bin/bash "$tmp_script" "$@"
+  ''