* fix: Toggling a nested list no longer converts parent lists
When the selection was inside a nested list, toggling the list type from
the toolbar or keyboard shortcut converted every list in the tree,
including ancestors of the selected list. This was caused by
doc.nodesBetween visiting ancestor nodes whose range overlaps the
selected list - these are now skipped so only the closest list and its
children are converted. Also guards against converting nested lists with
incompatible content such as checkbox lists.
Closes#12653https://claude.ai/code/session_01Q5hkRNp1Fo3jAc9fW5t68h
* test: Throw when selection text is not found in toggleList test helper
https://claude.ai/code/session_01Q5hkRNp1Fo3jAc9fW5t68h
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Co-authored-by: Claude <noreply@anthropic.com>
Tom Moor