This commit enhances the `PageAssistSelect` component with the following improvements:
- Adds a `ref` to the options container to automatically scroll to the selected option when the dropdown is opened.
- Fixes an issue where the `selectedOption` was not being correctly determined when the `options` array was updated.
- Improves the rendering of the selected option, ensuring that the loading state, placeholder, and selected option are displayed correctly.
- Adds a `data-value` attribute to the option elements to facilitate scrolling to the selected option.
These changes improve the overall user experience and functionality of the `PageAssistSelect` component.
This commit introduces a new `PageAssistSelect` component to the header, which replaces the previous `Select` component for selecting the active chat model. The new component provides improved functionality, including:
- Ability to display provider icons alongside the model name
- Truncation of long model names to ensure they fit within the available space
- Improved loading state handling
- Ability to refresh the model list on demand
These changes enhance the user experience and make it easier for users to quickly select the desired chat model.
