hyprland: disable blur on macbook (haswell igpu frame budget)

settings/hyprland.nix

@@ -117,7 +117,9 @@ in
             decoration = {
               rounding = 8;
               blur = {
-                enabled = true;
+                # Haswell iGPU can't afford 3-pass blur every frame — the
+                # blown frame budget shows up as pointer/input latency.
+                enabled = !isMacbook;
                 size = 1;
                 passes = 3;
               };