[abdul-karim-mia]

Resolves #2120

Description

When converting a project using briefcase convert, if pyproject.toml defines identical URLs across multiple metadata fields (e.g., both Homepage and Repository pointing to the same repository URL), input_url previously presented duplicate options in the selection prompt. Similarly, multiple author entries with identical names produced duplicate choices and redundant joined strings (Name & Name).

This PR:

• De-duplicates options extracted from self.pep621_data.get("urls", {}).values() while preserving insertion order using dict.fromkeys.
• De-duplicates author names extracted from self.pep621_data.get("authors", []) using dict.fromkeys.
• Adds unit tests in test_input_url.py and test_input_author.py verifying that duplicate URLs and authors are filtered out from selection questions.
• Adds newsfragment changes/2120.bugfix.md.

PR Checklist:

• I will abide by the BeeWare Code of Conduct
• I have read and have followed the CONTRIBUTING.md file
• This PR was generated or assisted using an AI tool

[freakboy3742]

Thanks for the PR; however, in this case, I think the solution is what was hinted at in this comment - switch to a PEP 621 representation for authors. We have a PR in flight for that at present (see #3131), so it should be resolved in the near future.

Apologies for the confusion.