style: apply ruff format to all source files

redmine_reporter/config.py

@@ -106,7 +106,8 @@ class AppConfig:
             output_dir=cls._resolve_str(raw, "output", "dir"),
             output_filename=cls._resolve_str(raw, "output", "filename")
             or "{author}_{from}_{to}.{ext}",
-            output_default_format=cls._resolve_str(raw, "output", "default_format") or "xlsx",
+            output_default_format=cls._resolve_str(raw, "output", "default_format")
+            or "xlsx",
             email=cls._resolve_email(raw),
         )
 
@@ -397,7 +398,9 @@ class Config:
             )
 
 
-def compute_next_period(last_from: str, last_to: str, precision: str) -> tuple[str, str]:
+def compute_next_period(
+    last_from: str, last_to: str, precision: str
+) -> tuple[str, str]:
     """Compute the next report period based on the last committed period.
 
     - For a full calendar month → next full calendar month.