Feature: Add API key loading from secrets.toml for chat widget

[joshlavroff]

---

name: Pull Request
about: Create a pull request to contribute to the project
title: ''
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Description of Changes
API keys for the chat component can now be loaded from a project's secrets.toml file. Keys that are entered during a session are not saved and will remain only in the sessionStorage until the app is closed.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• New example
• Test improvement

Testing
Code has been tested against the currently present chat example in the Iris example project.

2025-04-07.16-49-28.mp4

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have run my code against examples and ensured no errors
• Any dependent changes have been merged and published in downstream modules

[shivam-singhal]

@joshlavroff can you use tomli instead of tomllib? Also is there error testing in case secrets.toml doesn't exist?

[joshlavroff]

@shivam-singhal yes if there's no secrets.toml or no API key included it will ask for an API key when you try to use the widget. I will update to tomli today

[joshlavroff]

@shivam-singhal I've updated the PR to use tomli instead of tomllib

[joshlavroff]

@shivam-singhal just checking back in on this, are there any other changes that need to be made?

[joshlavroff]

@therealrinku thank you for pointing this out! I've resolved the issue