<.toggle_list>

Renders a toggle selection list with grouped items. ## Group structure Each group should be a map with: - `:id` - Unique identifier for the group - `:name` - Display name for the group header - `:items` - List of items in the group - `:selected` - Boolean indicating if all items in group are selected - `:expanded` - Boolean indicating if group is expanded (optional, defaults to true) - `:heading` - Section this group belongs under (optional) ## Sections Groups carrying the same `:heading` read as one section, titled once above the first of them. Pass the groups in the order they should appear; a heading is drawn whenever it differs from the previous group's, so a heading repeated later in the list titles a second section rather than being swallowed. Groups with no `:heading` are untitled, which is how a list of one section's worth of groups keeps its current shape. ## Item structure Each item should be a map that will be passed to the column slots. The item should have at minimum an `:id` field.