small refactors

src/widgets/todo.cpp

@@ -0,0 +1,9 @@
+#include <gtkmm/label.h>
+
+#include "widgets/todo.hpp"
+
+Todo::Todo(std::string icon, std::string title) : Popover(icon, title) {
+    auto label = Gtk::make_managed<Gtk::Label>(title);
+    label->add_css_class("todo-label");
+    this->set_popover_child(*label);
+}