Fix RichTextInput does not allow nesting unordered and ordered lists

[frlruehle]

Problem

Issue #11178

Solution

Finding innermost list type for toggling the buttons.

How To Test

Go to react demo page and nest ordered into bullet lists and vice versa.

Additional Checks

• [x ] The PR targets master for a bugfix or a documentation fix, or next for a feature
• The PR includes unit tests (if not possible, describe why)
• The PR includes one or several stories (if not possible, describe why)
• The documentation is up to date

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[Copilot]

Pull request overview

Fixes nested ordered/bulleted list toggling in ra-input-rich-text by making list toolbar state/actions target the innermost active list node, addressing issue #11178.

Changes:

• Update list toggle handler to toggle the selected format directly, and to toggle off the innermost list when unselecting.
• Replace “last active list in ListValues” detection with a selection-based “innermost list” lookup.
• Add getInnermostListType helper using Tiptap’s findParentNode.

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[slax57]

Works like a charm, thanks!