Relative worktrees not supported

[plehatron]

Description

When starting gitui on a repository with relative worktrees the following error happens:

Error: invalid repo path: unsupported extension name extensions.relativeworktrees; class=Repository (6)

Steps to reproduce

mkdir test-repo && cd test-repo
git init
git commit --allow-empty -m "initial commit"
git worktree add --relative-paths -b dev-branch ../test-repo.worktrees/dev-branch
gitui

Expected behavior

gitui starts without error.

Context:

• macOS 26.4.1
• gitui 0.28.1-nightly 2026-03-24
• git version 2.50.0