fix: resolve CI/CD issues and linting errors

regex_humanizer/cli.py

@@ -1,13 +1,11 @@
-"""Command-line interface for Regex Humanizer."""
-
 import json
 import sys
-from typing import Optional
+
 import click
 from .parser import parse_regex
 from .translator import translate_regex
 from .test_generator import generate_test_cases
-from .flavors import get_flavor_manager, get_available_flavors
+from .flavors import get_flavor_manager
 from .interactive import start_interactive_mode
 
 
@@ -194,7 +192,7 @@ def validate(ctx: click.Context, pattern: str, flavor: str):
         click.echo(f"AST node count: {len(get_all_nodes(ast))}")
     except Exception as e:
         click.echo(f"\nPattern: {pattern}")
-        click.echo(f"Validation: FAILED")
+        click.echo("Validation: FAILED")
         click.echo(f"Error: {e}")
         sys.exit(1)