refactor(darwin,nixos): simplify module imports and theme configs

home/apps/ghostty.nix

@@ -7,7 +7,6 @@
     enable = device.is "ryu";
     installBatSyntax = false;
     settings = {
-      theme = "catppuccin-mocha";
       font-family = [
         "Hasklug Nerd Font Mono"
       ];

home/apps/kitty.nix

@@ -1,4 +1,5 @@
 {
+  lib,
   pkgs,
   device,
   inputs,
@@ -9,13 +10,13 @@
     # enable = false;
     font = {
       # name = "FiraCode Nerd Font Mono";
-      name = "Hasklug Nerd Font Mono";
+      # name = "Hasklug Nerd Font Mono";
       # name = "Monaspace Krypton Var Light";
-      size = 13;
+      size = lib.mkDefault 13;
     };
     settings = {
-      background_opacity = "0.8";
-      background = "#000000";
+      background_opacity = lib.mkDefault "0.8";
+      background = lib.mkDefault "#000000";
       shell = "${pkgs.fish}/bin/fish";
       hide_window_decorations = "yes";
       cursor_trail = 1;

home/apps/zed.nix

@@ -101,7 +101,7 @@
       telemetry = {
         metrics = false;
       };
-      buffer_font_size = 15;
+      buffer_font_size = lib.mkDefault 15;
       # language_models = {
       #   ollama = {
       #     api_url = "https://ollama.ryu.darksailor.dev";
@@ -143,7 +143,7 @@
           };
         };
       };
-      theme = "Catppuccin Mocha";
+      theme = lib.mkDefault "Catppuccin Mocha";
     };
     userTasks = let
       zed =