[Bug report]: Grid custom filter not working with text input

Before submitting the bug report, please read and check the following items

[X] This isn't a feature request or a discussion topic (Please use discussions for that)
[X] I have searched open and closed issues for duplicates
[X] I have searched the documentation on the Serenity Platform website https://serenity.is/docs/
[X] I have read the frequently asked questions https://serenity.is/docs/startsharp/faq
[X] I have searched my problem in the discussions and the old issues https://github.com/serenity-is/Serenity/discussions

What happened?

The custom grid filters ("edit filter" link on bottom right of grid) is not working. You can type in custom text for contains/equals on a field, and when you click OK, the filter does not get added, and the grid does nothing. If you add only one filter on a field that are from a dropdown list, it works. (like Category in the Products page).

What did you expect to happen?

The field filter with custom entered text should be added to the filters when clicking OK.

How to reproduce?

Navigate to https://demo.serenity.is/Northwind/Product#
Click "edit filter"
Select Product Name
Type in "ch"
Click OK
No filter gets applied

What Serenity Nuget Versions are you seeing the problem on? (separated by comma)

8.4.1

Relevant log output

No response

Serene template version

No response

Sergen version

No response

Code editor

No response

Operating System

Windows 11

Node.js version

v18.18.0

TypeScript version

No response

Database type and version

SQL Server

On which device do you see the problem?

Deskop

On which operating system do you see the problem?

Windows (11)

On which browsers do you see the problem?

Firefox, Microsoft Edge

On what version of the browsers do you see the problem?

Latest

Additional information

No response

serenity-is / Serenity