fix: resolve CI type annotation issues

- Replaced deprecated typing.List/Dict/Tuple with native list/dict/tuple
- Fixed trailing whitespace issues
- Fixed blank line whitespace issues
- Removed unused variables and imports
- Applied black formatting

src/nl2gherkin/exporters/base.py

@@ -1,14 +1,13 @@
 """Base exporter class for BDD frameworks."""
 
 from abc import ABC, abstractmethod
-from typing import Dict, List
 
 
 class BaseExporter(ABC):
     """Base class for BDD framework exporters."""
 
     @abstractmethod
-    def export(self, features: List[str]) -> str:
+    def export(self, features: list[str]) -> str:
         """Export features to the target framework format.
 
         Args:
@@ -29,7 +28,7 @@ class BaseExporter(ABC):
         pass
 
     @abstractmethod
-    def get_configuration_template(self) -> Dict[str, str]:
+    def get_configuration_template(self) -> dict[str, str]:
         """Get configuration files for this framework.
 
         Returns:
@@ -37,10 +36,10 @@ class BaseExporter(ABC):
         """
         pass
 
-    def _extract_scenarios(self, feature: str) -> List[str]:
+    def _extract_scenarios(self, feature: str) -> list[str]:
         """Extract individual scenarios from a feature string."""
-        scenarios: List[str] = []
-        current_scenario: List[str] = []
+        scenarios: list[str] = []
+        current_scenario: list[str] = []
         in_scenario = False
 
         for line in feature.split("\n"):