feat: Introduce Dungeon Object Emulator Preview and Object Drawing Enhancements

- Added DungeonObjectEmulatorPreview for rendering dungeon objects using the SNES emulator, allowing real-time visualization of object graphics.
- Implemented ObjectDrawer class to handle drawing of various object types to background buffers, utilizing game-specific patterns.
- Updated DungeonCanvasViewer to integrate object rendering and improve background layer management.
- Enhanced DungeonEditorV2 to support the new emulator preview, providing a more interactive editing experience.
- Improved error handling and logging for better debugging during object rendering operations.

src/app/emu/cpu/cpu.h

@@ -767,6 +767,7 @@ class Cpu {
   }
 
   auto mutable_log_instructions() -> bool* { return &log_instructions_; }
+  bool stopped() const { return stopped_; }
 
  private:
   void compare(uint16_t register_value, uint16_t memory_value) {

src/app/emu/video/ppu.h

@@ -321,7 +321,6 @@ class Ppu {
   // Set pixel output format (0 = BGRX, 1 = XBGR)
   void SetPixelFormat(uint8_t format) { pixelOutputFormat = format; }
 
- private:
   int GetPixelForMode7(int x, int layer, bool priority);
 
   const int cyclesPerScanline = 341;  // SNES PPU has 341 cycles per scanline
@@ -343,6 +342,9 @@ class Ppu {
 
   // cgram access
   uint16_t cgram[0x100];
+
+ private:
+
   uint8_t cgram_pointer_;
   bool cgram_second_write_;
   uint8_t cgram_buffer_;