enhance search bar ui add generative ai add dark background

[SissiChen17]

1. add generative AI UI, we will need to fill in the specific API ID here to enable the use of generative AI. We add a dark background when loading the image to reduce eye strain. We adjust the size of the search bar UI to make it more compatible and intuitive
2. Issue index: Improving the search bar UI. #3804 Adding Darkmode #3838 Musical creation and transcription assistance via generative AI #3854
3. N/A

[SissiChen17]

we updated generative ai code

[github-actions]

This pull request has been open for more than 60 days without any activity. It will be closed in 3 days unless the stale label is removed or commented on.

[github-actions]

Closed pull request due to inactivity for more than 63 days.