feat: optimize user experience

[zhu-xiaowei]

Description

General Checklist

1. Support manual interruption of scrolling
2. Support configure OpenAI API Compatible Models
3. Support dollar($ and $$) format latex display
4. Support loading for wait first stream response
5. Support loading when open long text history session
6. Add an eye icon to show API keys
7. Add edit icon for auto select all raw markdown text
8. Add regenerate icon for regenerate any history AI response
9. Support tap message title to copy all response messages
10. Support quick switch text model by click bottom right model icon
11. Add notice for using Chinese prompt to generate images when nova-lite is not enabled
12. Add notice for DeepSeek models not support multi-modal

• The code changes have been fully tested
• Security oriented best practices and standards are followed (e.g. using input sanitization, principle of the least privilege, etc.)
• Documentation update for the change if required
• PR title conforms to conventional commit style
• If breaking change, documentation/changelog update with migration instructions

By submitting this pull request, I confirm that my contribution is made under the terms of the MIT-0 license.