add close icon to label editor popup

src/app/core/labeling.cc

@@ -12,6 +12,7 @@
 
 #include "app/core/common.h"
 #include "app/core/constants.h"
+#include "app/gui/icons.h"
 
 namespace yaze {
 namespace app {
@@ -116,6 +117,9 @@ void ResourceLabelManager::SelectableLabelWithNameEdit(
                          ImGuiInputTextFlags_EnterReturnsTrue)) {
       labels_[type][key] = *new_label;
     }
+    if (ImGui::Button(ICON_MD_CLOSE)) {
+      ImGui::CloseCurrentPopup();
+    }
     ImGui::EndPopup();
   }
 }