fix(Screenshot): allow region capture over shell overlays

quickshell/Common/ModalManager.qml

@@ -13,6 +13,7 @@ Singleton {
     property var currentModalsByScreen: ({})
 
     function openModal(modal) {
+        PopoutManager.screenshotActive = false;
         const screenName = modal.effectiveScreen?.name ?? "unknown";
         currentModalsByScreen[screenName] = modal;
         modalChanged();

quickshell/Common/PopoutManager.qml

@@ -10,6 +10,9 @@ Singleton {
     property var currentPopoutsByScreen: ({})
     property var currentPopoutTriggers: ({})
 
+    // Set by the screenshot IPC handshake (dms screenshot region select); cleared by end() or any popout/modal open.
+    property bool screenshotActive: false
+
     signal popoutOpening
     signal popoutChanged
 
@@ -47,6 +50,7 @@ Singleton {
     function showPopout(popout) {
         if (!popout || !popout.screen)
             return;
+        screenshotActive = false;
         popoutOpening();
 
         const screenName = popout.screen.name;
@@ -97,6 +101,7 @@ Singleton {
     function requestPopout(popout, tabIndex, triggerSource) {
         if (!popout || !popout.screen)
             return;
+        screenshotActive = false;
         const screenName = popout.screen.name;
         const currentPopout = currentPopoutsByScreen[screenName];
         const triggerId = triggerSource !== undefined ? triggerSource : tabIndex;