feat: show / hide past conversations before the current session

[shibbas]

Purpose

• Adds the option to view the past N conversations and include them in the chat API context for generation. Addresses [frontend] save user chat history  #100
• Fixed the bug where the chat thread was not being sent for requests in the context

Does this introduce a breaking change?

[ ] Yes
[X] No

Pull Request Type

What kind of change does this Pull Request introduce?

[X] Bugfix
[X] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

How to Test

• Get the code

git clone [repo-address]
cd [repo-name]
git checkout [branch-name]
npm install

• Test the code

npm run test:playwright

What to Check

Verify that the following are valid

• Chat history button shows up for chat, but not ask
• Chat history is preserved in the localstorage as an example
• History is included in the context for the chat.

Other Information