quickshell: animate calendar close on focus loss

Handle onActiveChanged to set open=false and start close timer
instead of letting grabFocus hide the popup instantly.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

settings/hyprland.nix

@@ -529,7 +529,7 @@ in
 
                           Timer {
                               id: calCloseTimer
-                              interval: 240
+                              interval: 230
                               onTriggered: calPopup.visible = false
                           }
                       }
@@ -850,8 +850,13 @@ in
                           onVisibleChanged: {
                               if (visible) {
                                   open = true;
-                              } else {
+                              }
+                          }
+
+                          onActiveChanged: {
+                              if (!active && visible) {
                                   open = false;
+                                  calCloseTimer.start();
                               }
                           }