[openstreetmap/openstreetmap-website] `/messages/{id}/mark?mark={unread/read}` returns HTML code (Issue #5222)

[Dimitar]

### URL

https://www.openstreetmap.org/messages/inbox

### How to reproduce the issue?

0. Have at least 1 message in the inbox
1. Mark it as read/unread
2. Notice that two requests are made at the same time (one POST and one GET).

The POST request goes to `https://www.openstreetmap.org/messages/{id}/mark?mark=unread`, while the GET request goes to `https://www.openstreetmap.org/messages/inbox`. Both requests return the same HTML code, which seems a bit wasteful on server resources if both are generated independently.

The most logical solution would be to change the response body of the POST request to have some short status code/text instead of the whole page HTML (assuming that won't break the turbo integration).

### Screenshot(s) or anything else?

![2024-09-18_00-39](https://github.com/user-attachments/assets/54255672-ea65-417f-887a-72be29f7097d)


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