Desktop notifications display raw HTML for pills

### Steps to reproduce

1. Log in & enable desktop notifications
2. Get a message with a pill in it that causes a notification

### Outcome

#### What did you expect?
Probably the notif to just display the name in the pill as text.

#### What happened instead?
Raw HTML of the pill in the notification.

### Operating system

macOS

### Application version

_No response_

### How did you install the app?

_No response_

### Homeserver

_No response_

### Will you send logs?

No

Start by reproducing the issue on macOS with desktop notifications enabled, then send a message containing a pill and inspect the notification rendering path. The fix is complete when the notification displays the pill's name as plain text rather than its raw HTML.

Written by the indexing model from the issue text.