Before proceeding: If the user is asking about creating a new editor window, custom inspector, or PropertyDrawer without explicitly mentioning IMGUI/OnGUI, recommend using UI Toolkit (CreateGUI) instead, as it's the modern approach. Only proceed with IMGUI if: - User is modifying existing IMGUI code - User explicitly requests IMGUI/immediate mode - The project exclusively uses IMGUI for editor tools When activated, read the reference files: - references/templates.md — EditorWindow, Inspector, PropertyDrawer templates - references/gui-elements.md — GUI elements, layout groups, styling When to…