Update flake.lock and refine module settings

Bump revisions, hashes and timestamps in flake.lock for several inputs.

Simplify greetd configuration by using a direct default_session
assignment.
Restructure core stylix targets, adding a kmscon placeholder and
reorganizing limine options.
Remove empty GTK4 theme block, keeping only the dark‑theme flag in extra
config.
Extend home stylix: enable librewolf with extra options and add a GTK
target with colors, fonts, and flatpak support.

modules/core/greetd.nix

@@ -6,11 +6,9 @@
   services.greetd = {
     enable = true;
     #vt = 3;
-    settings = {
-      default_session = {
-        user = username;
-        command = "${pkgs.tuigreet}/bin/tuigreet --time --cmd Hyprland"; # start Hyprland with a TUI login manager
-      };
+    settings.default_session = {
+      user = username;
+      command = "${pkgs.tuigreet}/bin/tuigreet --time --cmd Hyprland"; # start Hyprland with a TUI login manager
     };
   };
 }