Provide AI chat welcome screen

[kfenner]

Element should provide a welcome screen for the AI chat pattern. The specs are available on Figma: https://www.figma.com/design/oLi85frB3kWkfoG3m4DrK0/%F0%9F%94%B5-AI-patterns?node-id=7044-129242&t=LgKmPs1s3KEmB1an-1

/cc @Killusions @panch1739

[Killusions]

@kfenner Yes I'm on it, for this we also need to ship the key visual in the brand package

[kfenner]

@kfenner Yes I'm on it, for this we also need to ship the key visual in the brand package

OK - are you also doing that or should somebody else work on that?

[Killusions]

@kfenner The MR is there but Timo wanted to discuss the naming I think