Assembler: increase size of prompt to add patterns, select styles, etc.

[annezazu]

When going through the assembler experience, I noticed a prompt on the canvas describing actions to take. The problem is, even for my not very old eyes, it's incredibly hard to read or see:

To be safe since it's so small, this part is what I'm talking about:

We should either remove this entirely or make it more readable.

[richtabor]

Closing this as Assembler work is paused.