feat: added some class helpers, so that customCSS selectors are simpler to write.

[carliblaz]

Added some classes so customCSS selectors are simpler to write.

[gemini-code-assist]

Summary of Changes

Hello @carliblaz, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a series of new CSS classes across several core UI components. The primary goal of these additions is to provide more specific and intuitive hooks for custom styling, thereby simplifying the process of applying custom CSS and enhancing the overall customizability of the user interface.

Highlights

• Enhanced Custom CSS Selectors: New, descriptive CSS classes have been added to various UI components, making it significantly easier for developers to write custom CSS selectors and apply specific styles.
• Improved Styling Granularity: Key elements such as the powered-by badge, feedback dialog, chat window title, message container, prompt sections, user input area, and various buttons now have unique class names, allowing for more precise styling control.

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[gemini-code-assist]

Code Review

This pull request adds several CSS helper classes to make custom CSS selectors simpler to write, which is a good improvement for customizability. The changes are straightforward. I've found a couple of typos in the new class names that should be corrected for better maintainability.