🎨 Palette: Route UI messages to stderr

[ffalcinelli]

💡 What: Modified print_info, print_success, print_error, and print_warn methods in DialoguerUi (src/utils/ui.rs) to use eprintln! instead of println!.
🎯 Why: To adhere to Unix philosophies and allow users to pipe CLI data output from stdout cleanly without mixing it with UI messages and feedback.
📸 Before/After:
Before:

fn print_info(&self, msg: &str) {
    println!("{} {}", INFO, msg);
}

After:

fn print_info(&self, msg: &str) {
    eprintln!("{} {}", INFO, msg);
}

♿ Ergonomics: Better interoperability with standard Unix tools like jq or file redirection, preventing broken pipelines due to informational logs polluting standard output.

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PR created automatically by Jules for task 8284257667057775811 started by @ffalcinelli

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.86%. Comparing base (e91110c) to head (adff821).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #162   +/-   ##
=======================================
  Coverage   95.86%   95.86%           
=======================================
  Files          28       28           
  Lines        2345     2345           
=======================================
  Hits         2248     2248           
  Misses         97       97           

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