feat: add type ignore comments and remove unused imports

- Add `# type: ignore` comments to comfy.sd and folder_paths imports
- Remove unused imports: os, random, and extract_lora_name
- Clean up import statements across checkpoint_loader, lora_randomizer, and unet_loader nodes

py/nodes/checkpoint_loader.py

@@ -1,8 +1,7 @@
 import logging
-import os
 from typing import List, Tuple
-import comfy.sd
-import folder_paths
+import comfy.sd # type: ignore
+import folder_paths # type: ignore
 from ..utils.utils import get_checkpoint_info_absolute, _format_model_name_for_comfyui
 
 logger = logging.getLogger(__name__)

py/nodes/lora_randomizer.py

@@ -7,10 +7,8 @@ and tracks the last used combination for reuse.
 """
 
 import logging
-import random
 import os
 from ..utils.utils import get_lora_info
-from .utils import extract_lora_name
 
 logger = logging.getLogger(__name__)
 

py/nodes/unet_loader.py

@@ -1,7 +1,7 @@
 import logging
 import os
 from typing import List, Tuple
-import comfy.sd
+import comfy.sd # type: ignore
 from ..utils.utils import get_checkpoint_info_absolute, _format_model_name_for_comfyui
 
 logger = logging.getLogger(__name__)