quickshell: restore grabFocus for click-away dismiss

Smooth close on clock click, instant dismiss on focus loss.

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

settings/hyprland.nix

@@ -836,6 +836,7 @@ in
                           anchor.edges: Edges.Top | Edges.Left
                           anchor.gravity: Edges.Bottom | Edges.Right
                           anchor.adjustment: PopupAdjustment.Slide
+                          grabFocus: true
                           visible: false
                           color: "transparent"
 
@@ -849,6 +850,8 @@ in
                           onVisibleChanged: {
                               if (visible) {
                                   open = true;
+                              } else {
+                                  open = false;
                               }
                           }