Resolve #272

Purpose

• Resolves UI Component Refactoring: ChatMessageList.razor #272

Does this introduce a breaking change?

[ ] Yes
[x] No

Pull Request Type

What kind of change does this Pull Request introduce?

[ ] Bugfix
[ ] New feature
[x] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

README updated?

The top-level readme for this repo contains a link to each sample in the repo. If you're adding a new sample did you update the readme?

[ ] Yes
[x] No
[ ] N/A

How to Test

• Get the code

git clone https://github.com/aliencube/open-chat-playground.git
cd open-chat-playground
git checkout feature/272-uicomprefactor-chatmsglist

• Test the code

dotnet build
dotnet test --filter "FullyQualifiedName~ChatMessageListUITests"

What to Check

Verify that the following are valid

• Component separation: UI (.razor) and logic (.razor.cs) properly separated
• Test coverage: 9 UI tests passing with Theory/InlineData pattern

Other Information

• Refactoring scope: Single .razor file → separated structure following code-behind pattern
• Test strategy: E2E tests maintained, LLM dependencies removed, focused on component rendering only