Touch support for Tooltip and Crosshair. Tracking: ExaForce/operations#98698

Why

Tooltip and Crosshair only listened to mouse events. After a tap, browsers synthesize compatibility mouse events but no mouseout/mouseleave until the next tap elsewhere in the document. As a result:

• the tooltip sticks after the finger lifts, and in an embedded WebView (the mobile app) it sticks forever;
• a touch drag can't scrub the crosshair;
• iOS can treat the first tap as a hover and swallow click.

What

• Pointer Events: Tooltip and Crosshair listen to pointer events, and mouse hover behaves as before.
• Touch: a touch shows them only while the finger is down: on pointerdown, then following the finger, until pointerup or pointercancel. hideDelay is respected, and fingers after the first are ignored.
• Dragging across elements: Tooltip releases the implicit touch pointer capture on the chart, so a drag moves from segment to segment, from bar to bar, and across components. This also works when the touch starts on an axis.
• Trigger events: on a trigger match, Tooltip still calls stopPropagation(), now on pointermove and pointerdown.
• followTouchMove: a new Crosshair option, true by default. XYContainer sets touch-action: pinch-zoom on its SVG, so the crosshair follows the finger in both X and XY snap modes.
• Other charts: charts without a Crosshair keep the browser defaults: the page scrolls, and click events still fire.
• Fixes:
  • Pen taps now show the tooltip, and a pen gesture cancelled for scrolling hides it.
  • Re-touching within hideDelay no longer hides the new tooltip.
  • On iOS, touch boundary events without relatedTarget no longer hide the crosshair.
• LeafletMap TopoJSON: the feature under the pointer is now resolved on pointermove/pointerdown. Before, the tooltip lagged one event behind and didn't work on touch.
• Timeline: the synthetic scroll refresh event is now pointermove.

Behavior changes (for the release notes)

• Synthetic MouseEvents no longer drive Tooltip and Crosshair. Dispatch pointermove/pointerleave/pointerout instead. Where there's no PointerEvent (older jsdom), use new MouseEvent('pointermove', …).
• On XY charts with a Crosshair, a swipe that starts on the chart no longer scrolls the page. Set followTouchMove: false to restore it.
• onCrosshairMove receives a PointerEvent (or a WheelEvent).
• Mouse moves during d3 brush, drag and zoom gestures now update the Tooltip and Crosshair. d3 suppresses mousemove during those gestures but not pointermove.

Checklist

• Core (packages/ts) + unit tests (tooltip.spec.ts, crosshair.spec.ts)
• Dev example: Tooltip: Touch
• Wrappers (Angular regenerated for followTouchMove)
• Docs: Tooltip, Crosshair, LeafletMap, MCP WebView
• MCP widget test and Cypress/Playwright helpers moved to pointer events

Verification

• Unit tests: vitest 35/35.
• MCP: tests 164/164, plus the real-browser smoke lane.
• Playwright tooltip suite (Chromium): 11 passed, 5 skipped. The 5 LeafletMap tests are skipped by the spec itself.
• Builds: build:ts, build:react, build:angular and build:dev pass.
• Chromium real touch (CDP):
  • hold shows the tooltip, and lift hides it
  • a tap still fires the segment click
  • a vertical swipe on a chart without a Crosshair scrolls the page and hides the tooltip
  • the Crosshair scrubs horizontally and vertically, including in XY snap mode
  • the tooltip moves from bar to bar and from a point to a line
  • a second-finger tap and re-touching within hideDelay behave correctly
  • the LeafletMap TopoJSON feature tooltip is correct with mouse and touch
• iOS 26.5 Simulator Safari: hold/lift, tap → click, vertical swipe, horizontal scrub. This ran before the switch from pan-y pinch-zoom to pinch-zoom.
• Cypress tooltip.cy.ts: 7 failures from expectations that were already stale. The Playwright port of the same tests passes.

Not covered yet

• A real Android device.
• Desktop WebKit and Firefox (the Playwright browsers aren't installed).
• The iOS loupe on a long hold. -webkit-user-select: none on the chart container removes it; that's left as a follow-up.

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