fix: resolve CI linting and type checking issues

config_converter/cli.py

@@ -1,14 +1,13 @@
 """CLI interface for Config Converter."""
 
 import glob
-import os
 import sys
 from pathlib import Path
 from typing import List, Optional
 
 import click
 
-from config_converter.converters import BaseConverter, JsonConverter, YamlConverter, TomlConverter, IniConverter
+from config_converter.converters import BaseConverter
 from config_converter.generators import TypeScriptGenerator
 from config_converter.validators import SchemaInferrer, SchemaValidator
 from config_converter.utils import OutputFormatter
@@ -107,7 +106,7 @@ def batch_convert(
         sys.exit(1)
 
     try:
-        target_converter = BaseConverter.get_converter(to_format)
+        BaseConverter.get_converter(to_format)
     except Exception as e:
         formatter.print_error(str(e))
         sys.exit(1)
@@ -143,14 +142,14 @@ def batch_convert(
                     continue
                 converter.write(data, output_path)
             else:
-                formatter.print_error(f"Output directory required for batch conversion")
+                formatter.print_error("Output directory required for batch conversion")
                 failed_count += 1
                 failed_files.append(file_path)
                 continue
 
             success_count += 1
 
-        except Exception as e:
+        except Exception:
             failed_count += 1
             failed_files.append(file_path)