- add a size prop to OptionButtonGroup with a denser sm layout\n- use the compact filter group on the auto-import panel\n- keep the new size variants covered in form and route tests
- add a contrast override for badges inside primary buttons
- keep the singles process action aligned with the select/deselect row
- update import route tests for the new button label shape
- add a reusable shared Badge primitive alongside the existing form controls\n- use it for the import auto-filter count pills and remove the route-local badge styles\n- tighten option button spacing so embedded badges read cleanly
- add shared Base UI-backed checkbox and slider primitives under the form component layer
- move the singles import checkbox and auto-import confidence slider to the shared controls
- keep the import route tests aligned with the new accessible component roles
- replace index-based singles selection and search state with stable staging file keys\n- keep refreshes from shifting selected rows or open search panels when files are inserted or reordered\n- add a regression test that proves selection stays attached to the intended file across refreshes
- Move import page, tabs, workflow state, and route tests into React-owned route slices
- Preserve shell gating, staging queries, album matching, singles matching, auto-import, and queue behavior
- Add migration plan snapshot so cleanup/refinement can build on a stable baseline
