Desktop shows “Repository not initialized” for a working self-hosted repo after restart

## Describe the bug

I ran into a Git repository that works normally until I quit and reopen Buzz Desktop.

The repository was created on a self-hosted Buzz relay. I could push a commit, open the README, and browse the repository without any trouble. After a full `Cmd+Q` and relaunch, though, Buzz reported:

> Repository not initialized
> The project announcement exists, but its git repository was not found on the Buzz relay.

Retrying or fetching from the UI did not recover it.

## Steps to reproduce

1. Connect Buzz Desktop to a self-hosted relay.
2. Create a project and Git repository.
3. Assign an access channel.
4. Push a commit and confirm the README and files load in Desktop.
5. Quit Buzz Desktop completely with `Cmd+Q`.
6. Relaunch it and open the same repository.

## Expected behavior

The repository should still be available after restarting the app.

## Actual behavior

Desktop shows the repository as `Local missing` and says it was not found on the relay.

The local checkout is still present, and its `origin` points to the correct relay URL.

## Environment

- Buzz Desktop 0.5.20
- macOS
- Git 2.50.1
- Self-hosted Buzz relay 0.2.1

## Additional context

I checked the relay before and after restarting Desktop:

- the latest repository announcement still has the correct access channel
- the repository owner is still an active member of that channel
- the relay accepted the Git push and published the derived manifest event
- both the repository pointer and manifest are present in object storage
- the same repository worked in the original Desktop process before it was restarted

This looks related to #5186, but the failure seems different. In this case the pointer and manifest already exist, and the repository is usable until Desktop restarts.

I have reproduced this on the latest release, but not yet on a build from `main`. I’d be happy to test a patch or a current main build if that would help narrow it down.

Note: I’m not a native English speaker. This issue was originally written in Korean and then translated into English.