Fix additional type checking issues

- Update get_file return type to allow None in repo_operator.py
- Add type checking for decoded_filepath before decode operation
- Handle both bytes and string types from codecs.escape_decode

This reduces type checking diagnostics from 30 to 28.

Author: codegen-sh[bot]

src/codegen/git/repo_operator/repo_operator.py

@@ -566,7 +566,7 @@ def emptydir(self, path: str) -> None:
                 if os.path.isfile(file_path):
                     os.remove(file_path)
 
-    def get_file(self, path: str) -> str:
+    def get_file(self, path: str) -> str | None:
         """Returns the contents of a file"""
         file_path = self.abspath(path)
         try:
@@ -621,7 +621,10 @@ def get_filepaths_for_repo(self, ignore_list):
                 decoded_filepath, _ = codecs.escape_decode(raw_filepath)
 
                 # Step 4: Decode those bytes as UTF-8 to get the actual Unicode text
-                filepath = decoded_filepath.decode("utf-8")
+                if isinstance(decoded_filepath, bytes):
+                    filepath = decoded_filepath.decode("utf-8")
+                else:
+                    filepath = str(decoded_filepath)
 
                 # Step 5: Replace the original filepath with the decoded filepath
                 filepaths[i] = filepath