Undescriptive error when ~/.config/gitui is a broken symlink

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Describe the bug
When ~/.config/gitui is set to a broken symlink, gitui does not start and the only error message you get is this:

Error: File exists (os error 17)

To Reproduce
Steps to reproduce the behavior:

1. mv ~/.config/gitui ~/.config/gitui_bak
2. ln -s ~/does_not_exist ~/.config/gitui
3. Try to start gitui anywhere
4. See error

Expected behavior
Give a hint on what's wrong, such as "There seems to be a broken symbolic link at ~/.config/gitui".

Context:

• OS/Distro + Version: Fedora Linux 42
• GitUI Version gitui 0.26.3 2025-04-22 ()
• Rust version: cargo 1.86.0 (adf9b6ad1 2025-02-28)