feat(darwin): update aerospace's config

modules/darwin/system.nix

@@ -38,6 +38,7 @@
         show-recents = false; # do not show recent apps in dock
         # do not automatically rearrange spaces based on most recent use.
         mru-spaces = false;
+        expose-group-by-app = true; # Group windows by application
 
         # customize Hot Corners(触发角, 鼠标移动到屏幕角落时触发的动作)
         wvous-tl-corner = 2; # top-left - Mission Control
@@ -120,7 +121,10 @@
           DSDontWriteUSBStores = true;
         };
         "com.apple.spaces" = {
-          "spans-displays" = 0; # Display have separate spaces
+          # Display have separate spaces
+          #   true => disable this feature
+          #   false => enable this feature
+          "spans-displays" = true;
         };
         "com.apple.WindowManager" = {
           EnableStandardClickToShowDesktop = 0; # Click wallpaper to reveal desktop