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/osd/Content.qml

@@ -11,7 +11,6 @@ Item {
     id: root
 
     required property var uiState
-    required property Brightness.Monitor monitor
 
     anchors.verticalCenter: parent.verticalCenter
     anchors.left: parent.left
@@ -95,13 +94,10 @@ Item {
             implicitHeight: Config.osd.sliderLength
 
             function onWheel(event: WheelEvent) {
-                const monitor = root.monitor;
-                if (!monitor)
-                    return;
                 if (event.angleDelta.y > 0)
-                    monitor.setBrightness(monitor.brightness + 0.1);
+                    Brightness.setBrightness(Brightness.brightness + 0.1);
                 else if (event.angleDelta.y < 0)
-                    monitor.setBrightness(monitor.brightness - 0.1);
+                    Brightness.setBrightness(Brightness.brightness - 0.1);
             }
 
             CustomFilledSlider {
@@ -109,8 +105,8 @@ Item {
 
                 color: Config.colors.brightness
                 icon: Icons.getBrightnessIcon(value)
-                value: root.monitor?.brightness ?? 0
-                onMoved: root.monitor?.setBrightness(value)
+                value: Brightness.brightness
+                onMoved: Brightness.setBrightness(value)
             }
         }
     }

modules/osd/Interactions.qml

@@ -7,10 +7,8 @@ Scope {
     id: root
 
     required property PersistentProperties uiState
-    required property ShellScreen screen
     required property bool hovered
     required property bool suppressed
-    readonly property Brightness.Monitor monitor: Brightness.getMonitorForScreen(screen)
 
     function show(): void {
         if (!root.suppressed) {
@@ -34,7 +32,7 @@ Scope {
     }
 
     Connections {
-        target: root.monitor
+        target: Brightness
 
         function onBrightnessChanged(): void {
             if (root.uiState.osdBrightnessReact)

modules/osd/Wrapper.qml

@@ -8,7 +8,6 @@ Item {
     id: root
 
     required property var uiState
-    required property ShellScreen screen
 
     visible: width > 0
     implicitWidth: 0
@@ -61,6 +60,5 @@ Item {
         id: content
 
         uiState: root.uiState
-        monitor: Brightness.getMonitorForScreen(root.screen)
     }
 }