refactor(frontend): fine-tuning and cleanup after the design-system prep

[Kadrian]

Design-system prep, step 9: fine-tuning and cleanup

Stacked on #4008. The smaller follow-ups after the button work.

• ui-components/ToggleButtonGroup is react-aria's ToggleButtonGroup holding our ToggleButtons: selectionMode single or multiple, selectedKeys / onSelectionChange, disallowEmptySelection, the arrow keys move along the group, each button keyed by id; size on the group applies to every button
• segmented joins the buttons into one bordered control: the four mode switches (range/exact, OR/AND, the row prefix, the secondary id) are segmented sm groups, the selected segment is white with bold primary text, the secondary id options show their description as a tooltip
• the history's content filter and detail level use the plain vertical group
• stories: segmented in all sizes, with tooltips, vertical; multiple selection; a vertical icon toolbar