Stunner - Improve resize hint for nodes

Currently the resize hint for nodes is a red dot at the bottom left, which may not be very clear to the user what it means.

Maybe we should improve the resize hint to use something more clear to the user, like some arrows at each side that is visible when cursor is hover a node. Something like this:

Or a more clear hint like this one:

In the example above, the blur effect could be visible when mouse is hover the arrows.