[upstream] [TASK] Keep the docheader navigation row sticky

[github-actions]

Automatisch vorgeschlagener Cherry-pick aus TYPO3-CMS/form @ 14.3.

Upstream-Commit

• SHA: 892043ed97d4e29a8b5386980067bf46fc72b38e
• Author: Sebastian Michaelsen
• Date: 2026-08-07 08:48:02 +0200
• Reviewed-on (Gerrit): https://review.typo3.org/c/Packages/TYPO3.CMS/+/95218
• Resolves: #110390

Commit-Message

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[TASK] Keep the docheader navigation row sticky

The module docheader consists of a navigation row (content navigation
toggle, breadcrumb, language selector) and the button bar. Only the
button bar was sticky, so the navigation row scrolled out of the
viewport and stayed gone for the rest of the editing session.

Both rows are now wrapped in a sticky container, keeping breadcrumb and
language selector reachable while working in long lists. On very small
viewports the container scrolls up by the height of the navigation row,
which preserves the previous behaviour there.

Both bars wrap, so how much of the docheader stays pinned is a runtime
value rather than a fixed one. A resize observer publishes the measured
heights as CSS custom properties, and the sticky offset as well as
everything pinned below the docheader offsets against those.

Resolves: #110390
Releases: main, 14.3
Change-Id: I7a36a3643b0f9a727ad5285e1a636957d1766867
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/95218
Tested-by: core-ci <typo3@b13.com>
Tested-by: Garvin Hicking <garvin@hick.ing>
Reviewed-by: Garvin Hicking <garvin@hick.ing>

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