style: apply ruff format to all source files

tests/test_config.py

@@ -328,7 +328,9 @@ class TestConfigYamlFallback:
 
             assert Config.get_redmine_url() == "https://cli-override.example.com"
 
-    @mock.patch.dict(os.environ, {"REDMINE_URL": "https://env-redmine.example.com/"}, clear=True)
+    @mock.patch.dict(
+        os.environ, {"REDMINE_URL": "https://env-redmine.example.com/"}, clear=True
+    )
     def test_env_beats_yaml(self):
         with tempfile.TemporaryDirectory() as tmp:
             yaml_path = Path(tmp) / "config.yml"
@@ -501,7 +503,9 @@ class TestComputeNextPeriod:
     def test_datetime_precision_moves_by_seconds(self):
         from redmine_reporter.config import compute_next_period
 
-        nf, nt = compute_next_period("2026-06-30T09:00:00", "2026-06-30T12:00:00", "datetime")
+        nf, nt = compute_next_period(
+            "2026-06-30T09:00:00", "2026-06-30T12:00:00", "datetime"
+        )
         assert nf == "2026-06-30T12:00:01"
         assert nt == "2026-06-30T15:00:01"