Keep Settings recovery isolated and display-safe

config/dot/quickshell/services/SystemSettings.qml

@@ -206,6 +206,11 @@ Singleton {
     }
 
     // ── Applying options ────────────────────────────────────────────────────
+    // Test harnesses may replace the external compositor boundary while still
+    // exercising validation, commit routing, persistence, and reset replay.
+    // Production leaves this unset and always uses the verified Hyprland path.
+    property var compositorApplyOverride: null
+
     // `values` maps schema keys to values, e.g. { vrrPolicy: 3, gapsOut: 12 }.
     // The whole batch is validated before anything is sent, so one bad value
     // rejects the batch rather than half-applying it.
@@ -227,6 +232,9 @@ Singleton {
         if (Object.keys(requested).length === 0)
             return false;
 
+        if (root.compositorApplyOverride !== null)
+            return root.compositorApplyOverride(requested);
+
         // A write in flight is queued rather than refused. Options are applied
         // and verified one batch at a time, but the callers are a settings UI
         // and a startup replay of every compositor-backed preference -- they