displays: add configurator for niri, Hyprland, and MangoWC

- Configure position, VRR, orientation, resolution, refresh rate
- Split Display section into Configuration, Gamma, and Widgets
- MangoWC omits VRR because it doesnt have per-display VRR
- HDR configuration not present for Hyprland

quickshell/Modals/Common/DankModal.qml

@@ -273,8 +273,8 @@ Item {
         anchors {
             left: true
             top: true
-            right: root.useSingleWindow ? true : undefined
-            bottom: root.useSingleWindow ? true : undefined
+            right: root.useSingleWindow
+            bottom: root.useSingleWindow
         }
 
         WlrLayershell.margins {
@@ -284,8 +284,8 @@ Item {
             bottom: 0
         }
 
-        implicitWidth: root.useSingleWindow ? undefined : root.alignedWidth + (shadowBuffer * 2)
-        implicitHeight: root.useSingleWindow ? undefined : root.alignedHeight + (shadowBuffer * 2)
+        implicitWidth: root.useSingleWindow ? 0 : root.alignedWidth + (shadowBuffer * 2)
+        implicitHeight: root.useSingleWindow ? 0 : root.alignedHeight + (shadowBuffer * 2)
 
         onVisibleChanged: {
             if (visible) {