fix: resolve CI/CD linting issues

- Remove unused imports (F401) from analyzers and test files
- Remove unused typing imports (Any, Dict, List, Optional)
- Remove unused datetime imports
- Remove unused rich.columns import
- Remove unused pytest imports in test files

src/formatters/dashboard.py

@@ -4,7 +4,6 @@ from rich.console import Console
 from rich.panel import Panel
 from rich.table import Table
 from rich.text import Text
-from rich.columns import Columns
 from rich.box import ROUNDED