Handle PNG file generation.

src/holt59/aoc/utils/api/files.py

@@ -1,10 +1,11 @@
 from pathlib import Path
 from typing import Final
 
+from ...base import FileHandler
 from .base import dump_api_message
 
 
-class FileHandlerAPI:
+class FileHandlerAPI(FileHandler):
     def __init__(self, folder: Path):
         self.folder: Final = folder
 

src/holt59/aoc/utils/files.py

@@ -2,8 +2,10 @@ import logging
 from pathlib import Path
 from typing import Final
 
+from ..base import FileHandler
 
-class SimpleFileHandler:
+
+class SimpleFileHandler(FileHandler):
     def __init__(self, logger: logging.Logger, folder: Path):
         self.logger: Final = logger
         self.folder: Final = folder