Restore menu toggle behavior on keybinds and bar clicks

The old bash bin short-circuited with close_visible_quickshell_menu at
the top of open_quickshell_menu, so pressing any menu keybind while the
menu was open just closed it. The IPC path I introduced summoned every
time, so keyboard shortcuts couldn't dismiss \u2014 only outside clicks did
(which is why the bar icon appeared to toggle: clicking it while the
menu was open hit the menu's outer-click MouseArea, not the icon).

Add a menu.toggle IPC method:
  - if root.opened: cancel() and return "closed"
  - otherwise: behaves exactly like summon

Switch every Hyprland binding and the two bar-icon click handlers
(omarchy logo, battery right-click \u2192 power menu) to toggle. summon stays
as the always-open primitive for callers that want explicit summon
semantics (rare \u2014 right now nothing internal uses it).

default/quickshell/omarchy-shell/plugins/menu/Menu.qml

@@ -690,6 +690,17 @@ Item {
       return "ok"
     }
 
+    // Hitting the same menu keybind while the menu is already visible should
+    // close it — even if the requested target differs from the active one.
+    // Matches the old bash bin's `close_visible_quickshell_menu` short-circuit.
+    function toggle(initialMenu: string): string {
+      if (root.opened) {
+        root.cancel()
+        return "closed"
+      }
+      return summon(initialMenu)
+    }
+
     function refresh(): string {
       defaultMenuFile.reload()
       userMenuFile.reload()
@@ -697,7 +708,7 @@ Item {
     }
 
     function close(): string {
-      root.close()
+      root.cancel()
       return "ok"
     }