feat: overwrite support in CLI

[murfffi]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @murfffi, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request adds a new feature to the command-line interface (CLI) allowing users to specify whether existing files should be overwritten during download operations. It introduces an --overwrite flag and updates the output logging to provide clearer feedback based on the overwrite behavior.

Highlights

• New Feature: Introduced an --overwrite flag in the CLI to control whether existing files should be overwritten during download operations.
• User Feedback: Improved logging messages to clearly indicate if a file was downloaded or if it already existed and was not overwritten.

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[gemini-code-assist]

Code Review

This pull request introduces an overwrite flag to the CLI, which is a useful feature. The implementation is straightforward. My main concern, detailed in the review comment, is about the default value of this new flag, which I believe is unsafe.

[gemini-code-assist]

The default value for the overwrite flag is set to true. This is a potentially destructive default, as it could lead to users accidentally overwriting files. It's standard practice for operations that can overwrite data to be opt-in.

The default should be false to prevent accidental data loss. The user can then explicitly enable it by passing -overwrite or -overwrite=true.

Suggested change

	binOverwrite := fs.Bool("overwrite", true, "overwrite existing file")
	binOverwrite := fs.Bool("overwrite", false, "overwrite existing file")