refactor: Improve exception handling and logging in authentication and playlist services; enhance code readability and structure

app/services/dashboard.py

@@ -87,7 +87,7 @@ class DashboardService:
             )
             raise
 
-    def _get_date_filter(self, period: str) -> datetime | None:
+    def _get_date_filter(self, period: str) -> datetime | None:  # noqa: PLR0911
         """Calculate the date filter based on the period."""
         now = datetime.now(UTC)