fix(plugin-grid): a grouped list on a phone draws group headers and cards instead of the desktop table

.changeset/26896-grouped-list-phone-cards.md

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+---
+'@object-ui/plugin-grid': patch
+---
+
+fix(plugin-grid): a grouped list on a phone draws its group headers and cards instead of the desktop table
+
+Clause-②: no
+Metadata-protocol: none
+
+Below the 768px card breakpoint, `ObjectGrid` turned a plain list into one card per row but kept a grouped list (`grouping`) on its desktop table, so on a phone the titles were cut mid-word and every other column sat behind the pinned Actions column. A grouped list now takes the plain list's card layout: each group's header (its toggle, label and count), then that group's rows as the same cards, then, on a server-grouped list, the group's own pager. Collapsing a group hides its cards, and the grouped pager still pages whole groups. At a desktop width the grouped table is unchanged, and so is the plain list's card view, which now draws through the same card renderer.
+
+What to do: nothing.