Major Features

• CSS/Selectors: add Selectors Level 4 :has() support to the Blink backend (Tailwind CSS
  compatibility), including invalidation coverage and snapshots (#840).

Bug Fixes

• Rendering/Widget: avoid clamping portal/modal popup widget width to DOM parent constraints
  (#841).
• Rendering/Text: establish a local inline formatting context for inline spans hosted under
  RenderWidget, fixing flexbox/inline layout edge cases (#842).
• Flexbox: don’t stretch auto-height flex items when cross-axis constraints are bounded,
  improving WebFListView sizing inside flex containers (#843).
• RTL: isolate per-subtree direction overrides and support dynamic documentElement.dir
  updates (including logical margin remapping) (#844).
• Bridge: serialize Dart enums across the native bridge for stable NativeValue round-trips
  (#840).
• Form Controls: add HTMLOptGroupElement support and resolve related bridge build issues
  (#840).
• Scrolling: detach overflow scroll listeners on dispose to prevent stale callbacks/leaks.