✨ feat(resume): enhance style selection and management

- implement user-driven style selection process with fallback
  - improve readability and logging during style selection
  - introduce flexibility by reading style directly from file

♻️ refactor(style_manager): streamline style management logic
  - remove unused imports and functions
  - simplify style path retrieval
  - refine error handling in style management

🐛 fix(pdf_generation): correct style path retrieval logic
  - ensure style is selected before PDF generation
  - adjust style CSS reading in resume_generator

🔧 chore(logging): improve logging configuration and readability
  - standardize log messages across modules and remove Italian comments