docs: add Tree Grid subtree highlight example (#6211) (CP: v25.3) - #6237
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Adds a **Recipes** sub-page to the Tree Grid documentation (`articles/components/tree-grid/recipes.adoc`), with a **Highlighting a Subtree** (Flow) section as its first recipe. The new rendered `TreeGridSubtreeHighlight` example gives every descendant of the selected row a `selected-subtree` part name. The part name generator checks whether the selected item is an ancestor of the rendered item. Because part names are generated only when a row is rendered, the selection listener refreshes the descendants of both the previously and the newly selected item. The styling (`tree-grid-subtree-highlight.css`, imported in `styles.css`) sets two properties on `vaadin-grid::part(selected-subtree)`, because the themes use different ones for the cell background: - `--vaadin-grid-cell-background-color` for Aura - `--vaadin-grid-cell-background` for Lumo This PR also adds the `vaadin-grid-tree-toggle` import to `tree-grid-imports.ts`, the preimport for Java-only Tree Grid examples. Without it, the hierarchy column showed no toggles on pages where no Lit example imports the tree column. This change was split out of #6188. 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Co-authored-by: totally-not-ai[bot] <290682512+totally-not-ai[bot]@users.noreply.github.com> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com> Co-authored-by: Sascha Ißbrücker <sissbruecker@vaadin.com>
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