fix(hyprland/workspaces): disconnect hover-check timeout on Workspace destruction

The hover-check Glib::signal_timeout re-arms every 50ms and is not owned by
the Workspace. Since Workspaces are destroyed at runtime, a workspace removed
while its check is armed would let the timeout fire on freed memory (use-after-
free, also touching the destroyed m_button). Add a destructor that calls
stopHoverCheck() to disconnect the source.

include/modules/hyprland/workspace.hpp

@@ -30,6 +30,7 @@ class Workspace {
  public:
   explicit Workspace(const Json::Value& workspace_data, Workspaces& workspace_manager,
                      const Json::Value& clients_data = Json::Value::nullRef);
+  ~Workspace();
   std::string& selectIcon(std::map<std::string, std::string>& icons_map);
   Gtk::Button& button() { return m_button; };