feat: update hyprland, helix, bootloader and other configs

Changelog:
- autostart: remove hypridle from autostart script
- helix: add copilot LSP for Rust, JS/TS variants
- hyprland:
  - Refactor window rules with regex patterns
  - Update brightness controls for intel_backlight
  - Adjust pyprland scratchpad configurations
- bootloader:
  - Add i915 kernel modules
  - Disable initrd verbose logging
- greetd: update tuigreet command to use uwsm
- hyprland: enable hyprlock, hypridle services
- linux-kernel: add security hardening params
- ollama: add new LLM models (gemma3, deepcoder)
- utils: add sqlx-cli and kitty
- kitty: add config
- virtualisation:
  - Add lima, nerdctl
- vpn:
  - Enable mullvad VPN
  - Add mullvad and tor browsers
- stylus-themes: update to latest

nixos/display-manager.nix

@@ -6,12 +6,21 @@
     enable = true;
     settings = {
       default_session = {
-        command = "${pkgs.greetd.tuigreet}/bin/tuigreet --time --time-format '%I:%M %p | %a • %h | %F' --cmd Hyprland";
-        user = "greeter";
+        command = "${pkgs.greetd.tuigreet}/bin/tuigreet \
+          --time --time-format '%I:%M %p | %a • %h | %F' \
+          --cmd 'uwsm start hyprland'";
+        user    = "greeter";
       };
     };
   };
 
+  users.users.greeter = {
+    isNormalUser = false;
+    description  = "greetd greeter user";
+    extraGroups  = [ "video" "audio" ];
+    linger        = true;
+  };
+
   environment.systemPackages = with pkgs; [
     greetd.tuigreet
   ];