[Bug]: Merge failed and Polyscope shows a success message

### Platform

macOS

### Operating system version

macOS 26.2 (25C56)

### System architecture

ARM64 (M1, M2, etc)

### PolyScope Version

0.15.0

### Bug description

### Steps to reproduce

1. Ask Polyscope to change something in your code.
2. Change something in your code yourself
3. Try to commit & push it via Polyscope

### Relevant log output

```shell

```

Reproduce the issue in Polyscope 0.15.0 on an ARM64 Mac using the listed three-step sequence, and inspect the resulting merge and commit/push status. Trace where the operation result is surfaced in the desktop interface. Done means a failed merge is reported as a failure rather than showing a success message.

Written by the indexing model from the issue text.