feat(widgets): opt-in bundled widget tooltips - #10427

Summary

Stacked on #10414.

Applies the themed tooltip renderer to bundled button widgets using the protected member hook:

protected override onAfterRenderHTML = updateWidgetTooltip;

How It Fits With #10414

#10414 adds the generic updateWidgetTooltip helper and protected onAfterRenderHTML() lifecycle hook, but intentionally does not change bundled widget rendering.

This PR adds explicit metadata to button targets:

<button
  title="Zoom in"
  aria-label="Zoom in"
  data-deck-widget-tooltip="Zoom in"
/>

Each bundled button widget then calls the helper from its class member hook. The helper removes the native title after render and shows the styled deck.gl tooltip instead.

Changes

• Adds aria-label and data-deck-widget-tooltip to shared IconButton, plus the direct button markup in CompassWidget and GimbalWidget.
• Enables themed tooltips in Zoom, Fullscreen, Theme, Toggle, Screenshot, ResetView, Icon, Selector, Compass, and Gimbal widgets.
• Updates widget tooltip docs and focused integration coverage.

Coverage

This PR covers standalone bundled button widgets.

Loading, Timeline, Popup, Stats, and Scrollbar are intentionally unchanged: they are status, range, or panel widgets rather than standalone button widgets, even where they reuse IconButton. Scale, Geocoder, Info, and ContextMenu do not currently render native title tooltip targets.

Validation

• ./node_modules/.bin/tsc -p modules/widgets/tsconfig.json --noEmit
• ./node_modules/.bin/vitest run --project headless test/modules/core/lib/widget-manager.spec.ts test/modules/widgets/widget-tooltip.spec.ts test/modules/widgets/scrollbar-widget.spec.ts test/modules/widgets/selector-widget.spec.ts test/modules/widgets/theme-widget.spec.ts test/modules/widgets/toggle-widget.spec.ts
• ./node_modules/.bin/vitest run --project headless test/modules/widgets/*.spec.ts (79 passed; existing LoadingWidget async spinner test also fails on the base branch)
• yarn build
• yarn lint (passes with existing warnings, no errors)