Enhance Dungeon Editor with Room Graphics Management

- Refactored the DungeonEditor class to include new methods for loading and rendering room graphics, improving the overall graphics management system.
- Introduced LoadAndRenderRoomGraphics and ReloadAllRoomGraphics methods to streamline the loading process for room graphics.
- Updated the UI to provide buttons for loading room graphics and reloading all graphics, enhancing user interaction.
- Improved background rendering logic by adding RenderRoomBackgroundLayers, ensuring proper layering of graphics.
- Adjusted data types in UI text displays for better accuracy and consistency in rendering information.

src/app/editor/dungeon/dungeon_editor.h

@@ -116,6 +116,12 @@ class DungeonEditor : public Editor {
   std::pair<int, int> RoomToCanvasCoordinates(int room_x, int room_y) const;
   std::pair<int, int> CanvasToRoomCoordinates(int canvas_x, int canvas_y) const;
   bool IsWithinCanvasBounds(int canvas_x, int canvas_y, int margin = 32) const;
+  
+  // Room graphics management
+  absl::Status LoadAndRenderRoomGraphics(int room_id);
+  absl::Status ReloadAllRoomGraphics();
+  absl::Status UpdateRoomBackgroundLayers(int room_id);
+  void RenderRoomBackgroundLayers(int room_id);
 
   // Object rendering cache to avoid re-rendering the same objects
   struct ObjectRenderCache {