add show in file manager zsh function

modules/zsh.nix

@@ -113,6 +113,14 @@ in
         fi
       }
 
+      # Function to show current directory in file manager
+      function fm() {
+        local current_dir="$(pwd)"
+        ${if pkgs.stdenv.isDarwin then
+          "open -R \"$current_dir\""
+        else
+          "thunar \"$current_dir\" &"}
+      }
 
       # Interactive project launcher with fzf
       function proj() {