agra a1ab667178 keyboard: sampled native curve, interactive dismiss, scroll freeze ...

- Dart-side animation replay using exact native curve (21-point lookup
  table sampled from CADisplayLink) with 16ms start offset and 10ms
  shorter duration to stay ahead of the native animation pipeline.
- Snap-back reads bounds presentation layer so height doesn't jump.
- Dismiss defers resignFirstResponder until bounds animation completes,
  with immediate Dart close animation via animTarget/animGeneration.
- enableInteractiveDismiss accepts trackingInset to widen the gesture
  zone above the keyboard (for composer height).
- FFI: anim_target, anim_duration, anim_gen, system_keyboard_height,
  is_tracking exposed for Dart animation and scroll physics.

2026-04-15 22:46:43 +03:00

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