Agent sessions: explore a prominent button to create new sessions

[bpasero]

When the sessions view is showing side by side, it would be nice to have a quick gesture to create new sessions:

//cc @benibenj this should maybe be a dropdown similar to what you have built

[benibenj]

I like it. Keep it like this, don't make it blue and also show it in the stacked scenario if possible

[bpasero]

Or maybe more like this:

[benibenj]

Both fine. I just like when it doesn't stand out to much.

[bpasero]

And the winner is:

//cc @jo-oikawa