feat: Set the initial value of the chat modal to the recently created token

[agatha197]

resolves #2865

Changes: Adds automatic token population in the chat UI modal by passing the most recently created endpoint token to the chat interface.

Details:

• Extends ChatUIModal to accept endpoint token fragment data
• Adds logic to find the newest token from the endpoint token list
• Automatically populates the token field in the chat interface with the most recent token
• Enhances user experience by removing manual token entry requirement

How to test:

1. Click the LLM Chat Test from the serving page.
2. If it is not a public vllm model, you can get the custom modal.
3. If there are tokens, the most recently created and valid token will be set as the placeholder.
4. If there is no valid token, the placeholder is empty.

Checklist:

• [x] Mention to the original issue
• [ ] Documentation
• [ ] Minium required manager version
• [x] Specific setting for review (eg., KB link, endpoint or how to setup)
• [ ] Minimum requirements to check during review
• [ ] Test case(s) to demonstrate the difference of before/after

Review Requirements:

1. Verify that the newest token is correctly identified from the endpoint token list
2. Confirm the token field is pre-populated in the chat interface
3. Test that the chat functionality works with the auto-populated token

[graphite-app[bot]]

Your org requires the Graphite merge queue for merging into main

Add the label “flow:merge-queue” to the PR and Graphite will automatically add it to the merge queue when it’s ready to merge. Or use the label “flow:hotfix” to add to the merge queue as a hot fix.

You must have a Graphite account and log in to Graphite in order to use the merge queue. Sign up using this link.

[agatha197]

• #2864 👈 (View in Graphite)
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

[github-actions[bot]]

Coverage report for ./react

St.:grey_question:	Category	Percentage	Covered / Total
🔴	Statements	5.37% (+0.08% 🔼)	395/7352
🔴	Branches	4.67% (+0.08% 🔼)	237/5080
🔴	Functions	3.22% (+0.06% 🔼)	78/2422
🔴	Lines	5.28% (+0.08% 🔼)	380/7192

Test suite run success

124 tests passing in 14 suites.

Report generated by 🧪jest coverage report action from cf3c4b34d8d88cb0d968c826e85059dbc7f49366