feat: add --list/-l parameter to show files that would be downloaded

[kamilachludzinska-dev]

Hey :)

Would you be open to adding --list param? It gives the user an idea how many files (and their sizes) would be downloaded.

[cubic-dev-ai]

No issues found across 1 file

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Requires human review: This is a new feature (feat) that adds a CLI argument and introduces conditional branching in the main execution path, which requires human review for UX and logic validation.}