Add link towards element edition on details panel

A user should be able to easily edit the name & type of a selected element (like a text line on a page).

Fortunately we already have a nice modal to exactly do that from the children tree.

Please add a nice button with pencil button at the top of the details panel. I suggest 2 implementations:

a button next to "+ Annotate" (named "Edit") using the default white background to leave the annotation button as the main call to action
a small pencil icon in between the link & trash can icons