Describe the bug

In main.go:3620, a goroutine runs macOS sync operations:

go func() {
    _ = config.SyncMacOSContacts()
    _ = theme.SyncWithMacOS()
}()

Both errors ignored AND no panic recovery. If either function panics, app crashes silently.

To reproduce

Run on macOS with corrupted contacts database.

Expected behavior

Add panic recovery. Log errors instead of ignoring them.