Create a cypress test with percy snapshot for ReplyChain

[luixxiul]

Your use case

What would you like to do?

There should be a cypress test for ReplyChain to make a percy test for changes proposed by a PR like matrix-org/matrix-react-sdk#8972

Why would you like to do it?

Because it really is easy to cause a regression due to the nature of _components.pcss, which simply imports styles alphabetically without considering the semantic order in which styles should cascade and be inherited. Therefore, generally speaking, even moving a style block from one *.pcss file to another may cause a regression like this, unless you recognize the cascading order perfectly clear, which is hard for not only those who are not familiar with the style structure but also a team member/reviewer.

How would you like to achieve it?

Either by creating a cypress test for ReplyChain to let a percy test or an alternative tool check for you, whether or not the current codebase works as expected or by refactoring _components.pcss to have it respect the cascading order in order to improve the codebase and reduce dependency on an external tool like percy or by creating UI based on a brand new style codebase.

Have you considered any alternatives?

No response

Additional context

No response