cody: vsce fix auto-scrolling and update loading page

[abeatrix]

This PR updates our Loading Page to be more align with our new design.

Before	After

auto scroll still WIP

Test plan

See image above.

[sourcegraph-bot]

📖 Storybook live preview

[toolmantim]

Oh amazing! Mind if I fully port my animation across to it in this PR? Can do it today…

[abeatrix]

Yea go crazy on this! The auto scrolling doesn't work yet so you can just remove that change and add yours if you want 😃

[umpox]

@abeatrix I actually already started looking at this (the scrolling issue - we already have an issue here): #53641

The solution is not quite as simple as just removing that line, that was added to ensure that clicking a transcript item in history will always scroll to the bottom.

My proposed fix is to change how we pass transcript around to always ensure it is created with a unique ID. We already set this, we just don't use it (we kinda pass an empty array first and then update that with a real Transcript array when created after the first render).

My PR is here: #54139

Would appreciate your 👀 on this solution, maybe I have missed something

[abeatrix]

@umpox the auto scrolling was still WIP so you can ignore this PR. I have also moved the loading screen to a new PR so closing this PR