Global Styles panel: Add elements support to “Typography” section

[critterverse]

Opening this issue to discuss adding elements support to the “Typography” section of the Global Styles panel. This could potentially just be Text and Links at first.

[critterverse]

I’m removing the Needs Design tag as this should follow the original design presented in #34574 and build off what's already been built for the Color panel.

Some notes from the original issue:

• Elements operate in the same way as in the Colors panel
• The main difference is that the GroupItem contains a small preview of the specific typography attributes applied
• This preview is updated live to reflect current choices
• The individual tool panel for each element will also include a preview area

Based on what's currently in trunk, I think the elements would look like this — with the typographic preview taking up the same 24x24 px area as a color swatch:

^ Some wider fonts probably won't fit within this preview area so we may need to figure out a way of scaling down the type size within the available space in those instances, or making it a touch smaller across the board.