big refactor

modules/features/system/boot.nix

@@ -0,0 +1,24 @@
+{ inputs, pkgs, libs, ... }: let
+    background = libs.root "/assets/grub/background.png";
+    baseTheme = inputs.honkai-railway-grub-theme.packages.${pkgs.stdenv.hostPlatform.system}.cyrene-grub-theme;
+in {
+    boot = {
+        loader = {
+            efi.canTouchEfiVariables = true;
+
+            grub = rec {
+                enable = true;
+                device = "nodev";
+                efiSupport = true;
+                useOSProber = true;
+                splashImage = background;
+                theme = pkgs.runCommand "my-grub-theme" { } ''
+                    mkdir -p $out
+                    cp -r ${baseTheme}/* $out/
+                    chmod -R u+w $out
+                    cp ${background} $out/background.png
+                '';
+            };
+        };
+    };
+}