markdown editor v6

[burtonator]

Don't do a full QA of this PR yet. I'm still fixing a few more Safari + Mobile issues.

I'm going to start testing the integration into the site next and we can start being more picky then as some of the functionality might change.

The biggest change here is fixing Safari on iOS / iPad OS 18.1 and solving the keyboard detection issue.

Link to Issue

Closes: #9709

Description of Changes

Fixed the following issues.

• Focus seems to be inconsistent with the keyboard use so I need to double check everything and audit it.
• Make sure the secondary buttons focus properly. I don't them all of them are.
• selecting the 'p' block style in Safari on iPad causes the editor to lose focus and it goes to 'body'. This doesn't happen for h1, etc.
• paragraph selection DOES cause focus to be lost on mobile
• test safari + ipad
• keyboard does NOT become active on Safari + iPad
• The padding for the button on mobile button bar on iOS seems wrong

"How We Fixed It"

Test Plan

• none just yet.

Deployment Plan

Other Considerations

[masvelio]

some small comments