fix(home): replace deprecated stdenv.is* with hostPlatform.is*

home/base/gui/terminal/foot.nix

@@ -2,7 +2,7 @@
 {
   programs.foot = {
     # foot is designed only for Linux
-    enable = pkgs.stdenv.isLinux;
+    enable = pkgs.stdenv.hostPlatform.isLinux;
 
     # foot can also be run in a server mode. In this mode, one process hosts multiple windows.
     # All Wayland communication, VT parsing and rendering is done in the server process.

home/base/gui/terminal/ghostty.nix

@@ -11,7 +11,7 @@
   programs.ghostty = {
     enable = true;
     package =
-      if pkgs.stdenv.isDarwin then
+      if pkgs.stdenv.hostPlatform.isDarwin then
         null # installed via Homebrew cask on darwin
       else
         pkgs.ghostty;