feat: add inline code style

[Shimada666]

#1907

use github style

[li-boxuan]

Nice! I do feel the inline code is more distinguishable than before, but maybe it could be even better, by making the message background color a bit darker?

[Shimada666]

The messages from the assistant currently use the background color bg-neutral-500, while messages from the user use bg-neutral-700. If we make the assistant's message background color darker, like bg-neutral-600, the contrast with the user's messages will be less pronounced. Do you have some good idea?

[iFurySt]

@openartist has designed the chat bubble style before, you can use it as a reference. will it look better if add a radius to the code block? wdyt

[amanape]

Looks much better! As @iFurySt suggested, the regular code block would also look better if it had some radius on it as well. This PR is a good opportunity to make that change as well.

I think it is either a change to the frontend/src/components/markdown/code.tsx component or its parent.

[Shimada666]

@amanape @iFurySt

Good suggestion.😁 I added some radius to the code block. It looks like this.

Is there anything else we should add?

[amanape]

@Shimada666 Nice! This looks good