[openstreetmap/openstreetmap-website] Prevent page change when writing messages (Issue #4898)

[Dimitar]

### Problem

Currently when I'm writing a message, I might click accidentally some link/bookmark or other button that changes the page. When I come back (via the browser back button) the message that I was writing is gone. It would be nice if the browser asked you if you really want to leave the page.

### Description

_No response_

### Screenshots

_No response_

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