Bug: Pinned network computer don't show icon

### Description

### Steps To Reproduce

1. Create a network folder (Windows File Explorer > Properties > Sharing > Advanced share)
2. Enter `\\127.0.0.1`
3. Pin to sidebar
4. See icon missing

### Files Version

4.1.7.0

### Windows Version

10.0.26200.8655

### User ID

670e1391-905a-4fe8-a9da-a22f01a4676c

### Log File

[debug.log](https://github.com/user-attachments/files/29680414/debug.log)

No source file or test is named. Reproduce the missing-icon case in the Files app by creating a shared folder, opening \\127.0.0.1, and pinning it to the sidebar; inspect the linked debug.log while tracing the sidebar icon handling. Done means the pinned network computer displays its expected icon.

Written by the indexing model from the issue text.