fix: resolve CI/CD linting and formatting issues

- Replaced deprecated typing.Dict/List/Tuple with native types (UP035)
- Removed unused imports across all modules
- Fixed unused variables by replacing with _ prefix
- Added missing Optional type imports
- Reorganized imports for proper sorting (I001)
- Applied black formatting to all source files

loglens/formatters/base.py

@@ -1,28 +1,28 @@
-"""Base formatter class."""
+'''Base formatter class.'''
 
 from abc import ABC, abstractmethod
-from typing import Any, Dict, List, TextIO
+from typing import Any, Optional, TextIO
 
 
 class OutputFormatter(ABC):
-    """Abstract base class for output formatters."""
+    '''Abstract base class for output formatters.'''
 
-    def __init__(self, output: TextIO = None):
+    def __init__(self, output: Optional[TextIO] = None):
         self.output = output
 
     @abstractmethod
     def format(self, data: Any) -> str:
-        """Format data for output."""
+        '''Format data for output.'''
         pass
 
     def write(self, text: str) -> None:
-        """Write to output stream."""
+        '''Write to output stream.'''
         if self.output:
             self.output.write(text)
         else:
             print(text, end="")
 
     def flush(self) -> None:
-        """Flush output stream."""
+        '''Flush output stream.'''
         if self.output:
             self.output.flush()