feat!: support exponential brightness curve

I don't need most of the fluff for handling other types of displays, and getting rid of it lets me do something a lot nicer: add an exponential-gamma brightness display.

modules/ui/Interactions.qml

@@ -120,7 +120,6 @@ CustomMouseArea {
 
     Osd.Interactions {
         uiState: root.uiState
-        screen: root.screen
         hovered: root.osdHovered
         suppressed: root.osdSuppressed
     }

modules/ui/Panels.qml

@@ -13,7 +13,6 @@ Item {
     id: root
 
     required property PersistentProperties uiState
-    required property ShellScreen screen
     required property Item bar
 
     readonly property alias popouts: popouts
@@ -31,14 +30,12 @@ Item {
         id: popouts
 
         uiState: root.uiState
-        screen: root.screen
     }
 
     Osd.Wrapper {
         id: osd
 
         uiState: root.uiState
-        screen: root.screen
 
         anchors.verticalCenter: parent.verticalCenter
         anchors.right: parent.right

modules/ui/UI.qml

@@ -110,7 +110,6 @@ Variants {
 
                     visible: !uiState.uiState.hidden
                     uiState: uiState.uiState
-                    screen: scope.modelData
                     bar: bar
                 }
             }