[Bug]: Git dir followed unconditionally

Before submitting

• I searched existing issues and did not find a duplicate.
• I included enough detail to reproduce or investigate the problem.

Area

apps/desktop

Steps to reproduce

1. Create a folder in iCloud
2. Use --git-dir to move the git metadata and files out outside the project
3. Open the original folder in t3code as a project
4. t3 opens the root project in the git folder instead and can't find anything like skills

Expected behavior

The follow to the git-dir and it's git-dir is fine, but if the back link is missing it should stay in the requested folder not a random git folder.

Actual behavior

Follows git-dir blindly and doesn't respect the folder the user requested.

Impact

Minor bug or occasional failure

Version or commit

Nightly latest

Environment

MacOS

Logs or stack traces

Screenshots, recordings, or supporting files

No response

Workaround

Fixed by setting the backlink:

git --git-dir=$HOME/.obsidian/git/v1 config core.worktree $HOME/obsidian/V1

Start in apps/desktop by reproducing the project-opening flow with a folder whose Git metadata is moved using --git-dir. Trace how the requested folder is resolved when the Git directory points elsewhere, then verify that a missing backlink keeps the requested folder instead of opening the Git folder.