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/core/packages/essentials.nix

@@ -1,4 +1,9 @@
-{pkgs, ...}: {
+{
+  pkgs,
+  inputs,
+  system,
+  ...
+}: {
   environment.systemPackages = with pkgs; [
     mpv
     pavucontrol
@@ -53,5 +58,10 @@
     hunspell
     hunspellDicts.pl_PL
     hunspellDicts.en_US
+    # Noctalia Shell Dependencies
+    matugen
+    app2unit
+    gpu-screen-recorder
+    power-profiles-daemon
   ];
 }