Pivot Quick Wins

All quick wins from this batch have been implemented and covered by focused unit tests plus browser-context E2E tests where applicable.

Next Candidates

• Wire CSV/TSV/state helpers into toolbar/menu commands.
• Add final drilldown modal styling around the table-ready controller state.
• Add a saved-views UI panel on top of the saved-view collection helpers.
• Add field-panel UI for toggling hidden fields interactively.