feat: add 'T' hotkey to convert first tag to project

Implement a new 'T' hotkey that automatically converts the first tag
of a task into its project field. This provides a quick workflow for
users who initially tag tasks and later want to organize them into
projects.

The operation:
- Takes the first tag from the selected task
- Sets it as the task's project
- Removes the tag from the task's tag list

This is useful for migrating from tag-based organization to
project-based organization in Taskwarrior.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

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