neovim before nixvim

Signed-off-by: Michael Thomson <michael@michaelthomson.dev>

modules/home-manager/tmux/default.nix

@@ -1,8 +1,12 @@
 { pkgs, config, ... }:
 
+# TODO: Remove the default shell and default-command once tmux sensibleOnTop fixes their shit
+# ref: https://github.com/nix-community/home-manager/issues/5952
+
 {
   programs = {
     tmux = {
+      shell = "${pkgs.zsh}/bin/zsh";
       enable = true;
       shortcut = "Space";
       mouse = true;
@@ -31,6 +35,9 @@
 
       set -g window-status-current-style "fg=$border_active_fg"
       set -g window-status-style "fg=$fg"
+
+      set -gu default-command
+      set -g default-shell "$SHELL"
       '';
     };
   };