Secondary icon buttons should be focusable and clickable via keyboard

[AlbyIanna]

Describe the problem

Secondary buttons with icon are not focusable and therefore not usable with a keyboard 😢

To reproduce

Try to focus on the contextual menu button of the tab bar.

Or the icons in the sketchbook when focusing on a sketch:

Expected behavior

You should be able to move the focus on them and click them.

Arduino IDE version

any

Operating system

N/A

Operating system version

any

Additional context

No response

Issue checklist

• I searched for previous reports in the issue tracker
• I verified the problem still occurs when using the latest nightly build
• My report contains all necessary details