Upgrade to MUI X Tree View v9 (@mui/x-tree-view 9.0.2), matching the MUI v9 runtime shipped by muiMaterial.
The tree view now shares muiMaterial’s MUI Material, system and emotion runtime instead of bundling its own copy, so muiMaterial::ThemeProvider() and theme-aware sx values now apply to tree view components.
Add a test that every wrapped component exists in the bundled JavaScript.
Add runnable usage examples for every exported function in inst/examples/, e.g. source(system.file("examples/RichTreeView.R", package = "muiTreeView")).
Reorganize the documentation to mirror the official MUI X Tree View docs, with links to the original pages: one article per Simple and Rich Tree View topic (items, selection, expansion, customization, label editing), Tree Item customization, accessibility, data frames with asMuiTree(), Shiny, navigation with reactRouter and theming. The “introduction” article is replaced by “Overview”.