Enhancement: PR additional comment should use Gum Write

[sebastianhuus]

The "additional comment" option for pull request creation should be updated to use Gum Write instead of Gum Input to facilitate longer, more detailed comments.

Motivation

The current Gum Input limits the length and formatting capabilities of the "additional comment" for pull requests. Using Gum Write would provide a more robust and user-friendly experience, allowing users to write comprehensive descriptions, include markdown formatting, and generally express themselves more fully when creating PRs. This is crucial for clear communication and detailed documentation within Git workflows.

Proposed Solution

Replace the existing Gum Input call for the "additional comment" field in the pull request creation script with a Gum Write command. This change should ensure that the input is captured correctly and passed to the GitHub CLI gh pr create command.

Acceptance Criteria

• When creating a pull request, the "additional comment" prompt uses Gum Write.
• Users can input multi-line comments with markdown formatting.
• The entered long-form comment is correctly applied to the created pull request.
• The overall pull request creation workflow remains stable and functional.

Additional Context

This change aligns with the project's goal of providing robust Zsh automation scripts for Git workflows and GitHub issue management, enhancing the user experience for PR creation.

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