feat(terminal): hide title bars in foot and ghostty

Signed-off-by: Ryan Yin <xiaoyin_c@qq.com>

home/base/gui/terminal/foot.nix

@@ -30,6 +30,10 @@
         blur = true; # requires foot >= 1.26 and compositor support (e.g. niri v26.04+)
       };
 
+      csd = {
+        preferred = "none"; # no title bar / menu button
+      };
+
       mouse = {
         hide-when-typing = "yes";
       };

home/base/gui/terminal/ghostty.nix

@@ -22,6 +22,9 @@
       font-family = "Maple Mono NF CN";
       font-size = 13;
 
+      # hide title bar/header bar (Linux only; on macOS it would remove the traffic lights too)
+      window-decoration = pkgs.stdenv.hostPlatform.isDarwin;
+
       background-opacity = 0.93;
       # only supported on macOS;
       background-blur-radius = 10;