Add an opt-in card view to the shared data-table stack (DataTablePage),
toggled via a segmented control in the toolbar with per-table localStorage
persistence. Cards render generically from column meta by default, with an
optional renderCard slot. Defaults to table-only so existing pages are
unchanged.
Wire it into the channels page with a bespoke ChannelCard that reuses every
column's cell renderer, preserving all table information and interactions
(selection, inline priority/weight, balance refresh, status, actions, tag
expand).
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