fix: avoid creating duplicated convert to draft buttons

[braineo]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @braineo, 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 addresses an issue where the 'convert to draft' button could appear multiple times or incorrectly on a merge request detail page. The changes introduce robust conditional rendering, ensuring the button is only present when a merge request is not yet a draft and is automatically removed if the merge request's title indicates it's already a draft. This improves the user experience by providing a cleaner and more accurate interface.

Highlights

• Preventing Duplicate Buttons: Implemented logic to prevent the 'convert to draft' button from being duplicated on merge request detail pages, ensuring it appears only when necessary.
• Dynamic Button Management: The button is now dynamically added if the merge request is not a draft and removed if it is already a draft, improving UI consistency.
• Code Refactoring: The logic for retrieving the merge request title has been encapsulated into a reusable getTitle function.
• Button Identification: An id attribute (#convert-to-draft-button) has been added to the dynamically created button for easier DOM manipulation and identification.

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[gemini-code-assist]

Code Review

This pull request effectively addresses the issue of duplicate 'Convert to draft' buttons being created on the merge request detail page. The approach of adding a unique ID to the button and checking for its existence before creation is solid. Additionally, the logic is enhanced to remove the button if the merge request is already a draft, which improves the user experience. The use of a getTitle helper function to fetch the latest title within the event handler is also a good improvement. I've found one minor issue with a redundant line of code that can be removed.