New "add component" menu item on component

[AdRiley]

We want a new + menu item on the small menu that sits underneath the menu like so

Pressing it opens the component browser connecting a new component to the existing one.

If the visualisation is open the + button needs to move down under the visualisation

When the new component is added it should be positioned

• vertically in line with where the + button is when it is pressed
• horizontally left aligned with component it is being added from

I think the + should be grey to match the other wheel icons. Not blue like in the screenshots and the existing + button.

[farmaazon]

When the new component is added it should be positioned

vertically in line with where the + button is when it is pressed
horizontally left aligned with component it is being added from

What if the place is already occupied? Also, I think the node appearing in place of + button will be very close to the node above - much closer than it is today, when you press enter with node selected.

[AdRiley]

This is the enter button spacing today

Not sure we will be far out. Can always move the + button down a bit.

In terms of collisions. I think we just put it on top for first pass. The user can see where it is going to go so it is their choice.

[enso-bot]

Keziah Wesley reports a new STANDUP for today (2024-03-01):

Progress: Implemented add-node buttons. Also implemented hiding placeholders (#9208). It should be finished by 2024-03-01.

Next Day: Next day I will be working on the #9219 task. Pick something from backlog.