Summary

• Update the hidden-filter toggle tooltip in the faceted filter menu to describe the current action.
• Reuse the same action text for the button aria-label.

Impact

• Users now see Show N hidden filters before expanding hidden filters and Hide N hidden filters after they are shown.
• No API, storage, or compatibility impact.

Validation

• npm run check

Notes

• Local browser QA was not run because http://localhost:7110/api/v2/about was not listening in this worktree.