Navigation: Add missing typography support

[aaronrobertshaw]

Related:

• Tracking: Addressing Design Tooling Consistency #43241
• Tracking: Typography Design Tools Consistency #43242

What?

Adds missing typography supports to the Navigation block.

Why?

• Improves consistency of our design tools across blocks.

How?

• Opts into missing letter-spacing typography support.

Testing Instructions

1. In the site editor, select a navigation block.
2. Navigate to Global Styles > Blocks > Navigation > Typography
3. Adjust the letter-spacing value, ensuring it is reflected in both the preview and the frontend.
4. Switch to the "Settings" sidebar, then select a navigation block.
5. Adjust the letter-spacing control here and ensure it overrides the global style.
6. Clear customizations and test that letter spacing can be applied via theme.json

Example theme.json snippet:

			"core/navigation": {
				"typography": {
					"letterSpacing": "3px"
				}
			}

Screenshots or screencast

Screen.Recording.2022-08-24.at.1.09.47.pm.mp4

[glendaviesnz]

Worked for me:
✅ Letter spacing option appeared in global styles block settings for Navigation block and changes were reflected in site editor, post editor and front end
✅ Changes to letter spacing at block level in post editor were applied in editor and frontend
✅ theme.json setting was reflected in site and post editor and frontend