T13b Trees: Tree, TreeNode, TreeSelect, Outline, Disclosure (review pending: codex 401)

tasks/ch01-10.md

@@ -210,7 +210,7 @@
 - [x] Autocomplete → `forms::Combobox::free`
 - [x] MultiSelect
 - [x] CascadeSelect / Cascader
-- [x] TreeSelect → lands with Lists & Trees (T13): its list is a Tree
+- [x] TreeSelect → `lists::TreeSelect` (T13b): forms cannot import lists
 - [x] TransferList
 - [x] ListBox
 - [x] ChoiceChips / FilterChips