[madelineluke]

Fixes #1082

Stacked on #1080. Retarget to main after #1080 merges.

What changes for consumers

Following the chart stability RFC:

• Data updates and rebuilds close open popovers and action bars, clear the selection, reset hover and the tooltip, and drop hidden legend series that no longer exist in the data.
• No-op and signal-only updates keep everything. Passing equal data in a new array counts as a no-op.
• Series and categories that return after a data update now keep their first-appearance order and colors, as on a fresh mount. Before, they moved to the end. This was a pre-existing bug on main.

How

• View host: on a table change it resets the interaction signals (selection, hover, highlighted group) to their initial values in the same update, then calls a new onInteractionReset callback. It also calls the callback after a rebuild.
• useInteractionReset: closes registered dialogs (popovers and the lab action bar), clears selectedData, hides the tooltip, and prunes uncontrolled hidden series using the legend entry scales.
• Spec builder:
  • Single-field discrete domains sort by min(rscMarkId).
  • The legend aggregate carries min(rscMarkId) and is sorted, so legend entries line up with the domain.

Behavior to be aware of

• A rebuild closes open popovers, even when the consumer triggered the rebuild.
• A controlled hiddenSeries prop is never pruned; that's the consumer's to manage.
• Focus signals are not reset.
• Row ids (rscMarkId) are reassigned on every data update, so selection can't survive one. A possible follow-up: keep the selection when the row still exists, keyed by idKey. That would diverge from the RFC.

Testing

• Chart.interactionRetention.test.tsx: the keep/reset matrix for popover, selection, hover, tooltip and hidden series.
• Chart.stability.test.tsx: restored series and bar category order.
• Unit tests for the view host, the adapter, the scale builder and the legend builder.
• Removed the test.fail markers for data updates and rebuilds from browser/interactionRetention.test.ts. The SVG cases pass. Canvas screenshot diffs are text antialiasing; main shows similar flakiness.