refactor(ui): own Display control subscriptions and cleanup

docs/CODE-BOUNDARIES.md

@@ -243,3 +243,10 @@ Clearing permits reuse; destruction is final. Neither module imports the app,
 renderer, persistence or services. The facade retains panel visibility, share
 restore claims and render scheduling. Both controls are destroyed before the
 facade's asynchronous teardown can yield.
+
+## Display controls
+
+`ui/display` owns Display button, selector and slider subscriptions. It receives
+DOM elements and explicit actions, imports no application or effect singleton,
+and releases every listener on destruction. Settings and rendering remain with
+the caller.

docs/CURRENT-STATE.md

@@ -1,5 +1,12 @@
 # God's Eye View Current State
 
+## Display control ownership
+
+Display button, selector and slider listeners have a single destroyable owner.
+The application supplies actions and retains effect settings, restore claims and
+rendering. Native keyboard editing, model modes and current defaults are preserved.
+Destroying the UI removes these listeners before asynchronous teardown.
+
 ## Application shortcuts and shader parameter controls
 
 `ui/input` supplies the bubbling application shortcut listener and generated