Refactor DungeonCanvasViewer for enhanced rendering and object management

- Introduced new rendering methods for various object types including stairs, chests, doors, walls, pots, and sprites, improving visual representation in the dungeon canvas.
- Updated the DrawDungeonCanvas method to streamline object rendering and enhance graphics handling.
- Added detailed layer information overlay to provide context on room objects and sprites.
- Implemented object dimension calculations for walls to ensure accurate rendering based on size properties.
- Improved fallback rendering for objects without valid graphics, enhancing user experience during object placement and editing.

src/app/editor/dungeon/dungeon_renderer.h

@@ -30,8 +30,7 @@ class DungeonRenderer {
   void RenderObjectInCanvas(const zelda3::RoomObject& object,
                             const gfx::SnesPalette& palette);
   void DisplayObjectInfo(const zelda3::RoomObject& object, int canvas_x, int canvas_y);
-  void RenderLayoutObjects(const zelda3::RoomLayout& layout,
-                           const gfx::SnesPalette& palette);
+  void RenderSprites(const zelda3::Room& room);
   
   // Background rendering
   void RenderRoomBackgroundLayers(int room_id);