Can't clear 'Network storage device failed' notification

### Describe the issue you are experiencing

same as in issue : https://github.com/home-assistant/supervisor/issues/6034

### Describe the issue you are experiencing

I'm sharing a folder from my Windows computer over the network for Home Assistant to put backup files in. Sometimes this computer goes offline (rebooting after installing a program or Windows Update). Then there's the 'Network storage device failed' notification in Home Assistant's settings menu by Home Assistant Supervisor. The problam is, when the connection repairs itself, there is no way to get rid of the notification(s). 'Remove' removes the network drive and 'Reload' fails and tells me to check the logs. In the logs I find the moment it lost connection but no new log entries from pressing the 'Reload' button or when the connection resumed again.

### What type of installation are you running?

Home Assistant OS

### Which operating system are you running on?

Home Assistant Operating System

### Steps to reproduce the issue

1. Share a folder over the network with Home Assistant
2. Make the storage host go offline
3. Wait until you get the 'Network storage device failed notification' by Home Assistant Supervisor
4. Let the storage host go online
5. ...

Installatiemethode Home Assistant OS
Core 2026.4.2
Supervisor 2026.04.0
Operating System 17.2
Frontend 20260325.7

### What type of installation are you running?

Home Assistant OS

### Which operating system are you running on?

Home Assistant Operating System

### Steps to reproduce the issue

Share a folder over the network with Home Assistant
Make the storage host go offline
Wait until you get the 'Network storage device failed notification' by Home Assistant Supervisor
Let the storage host go online
...

### Anything in the Supervisor logs that might be useful for us?

```txt
Logger: homeassistant.components.backup
Bron: components/backup/manager.py:1173
integratie: Backup (documentatie, problemen)
Eerst voorgekomen: 14 april 2026 om 00:45:00 (5 gebeurtenissen)
Laatst gelogd: 24 april 2026 om 19:39:45

Backup agents ['hassio.TvvDecoder_Harddisk'] are not available, will backup to ['hassio.local']
```

### System information

Installatiemethode Home Assistant OS
Core 2026.4.2
Supervisor 2026.04.0
Operating System 17.2
Frontend 20260325.7

### Supervisor diagnostics

_No response_

### Additional information

_No response_

Start with the related issue 6034 and the backup log location components/backup/manager.py:1173, then trace the network storage failure notification and its Reload action. Reproduce the host-offline and host-online sequence; done means the existing notification can be cleared or reloaded successfully after the storage host reconnects.

Written by the indexing model from the issue text.