ChatBot - Evaluate and Spec out High Contrast Designs

[lboehling]

As part of the HC design work, we need to evaluate the ChatBot extension and identify any custom styles that need high contrast tokens applied in order to support HC theme.

[lboehling]

The following custom chatbot components need additional HC border styles:

• ChatBot Container - Overlay
• ChatBot Container - Docked
• ChatBot Modal
• ChatBot History Drawer
• History Menu Items
• Message Bar
• Icon Buttons
• Attachments
• Message Snippets
• User Feedback Cards
• Image Cards
• Source Cards
• Message Divider - Guest Announcement
• Spinner
• Animated Dots

Detailed Specs for the above components can be found here: https://www.figma.com/design/wKcOq7IrzfL1gEK2mocd6r/High-Contrast-Component---Extension-Specs?node-id=12421-109383&t=PQfL5JGxNFuD7qWK-4

FYI @rebeccaalpert @kaylachumley