[TASK] Streamline typo3-backend-editable-page-title

The editable page component now looks and feels like a
regular h1 element, and keeps this appereance when edit
mode is triggered. The new edit mode blends in and avoids
layout shifts as much as possible.

Resolves: #99879
Releases: main
Change-Id: Ie21ed58a822731a70342247fc13c1a45a00f2504
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/77786


Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>