fix(ios/fabric): stop overriding JS width in Yoga layout

[Scr3nt]

Summary

The adopt method in ComponentDescriptors.h calls setSize() with both width and height from sizeThatFits:UILayoutFittingCompressedSize. Because UIDatePicker has a native minimum width of 280pt, this forces a fixed width on the Yoga node, overriding any JS style such as width: "100%".

This PR changes the native layout code to only set the height from the native measurement, letting the JS side control the width through regular Yoga styles.

Changes

• ShadowNodes.h: Add setMeasuredHeight(float) method that only sets yoga::Dimension::Height on the Yoga node style, leaving the width untouched
• ComponentDescriptors.h: Replace setSize() call with setMeasuredHeight() in the adopt method

Before / After

Fixes #1014

[camcam-lemon]

Thank you so much for this PR. I have been struggling with this issue for a long time.

While testing my product, I found an additional issue: when using mode="datetime" with display="inline" on iOS, the time picker row
is cut off because sizeThatFits:UILayoutFittingCompressedSize does not include the time picker row height in its
measurement.

I was able to fix this by adding the following to updateMeasurements in RNDateTimePickerComponentView.mm:

if (@available(iOS 14.0, *)) {
  if (_dummyPicker.datePickerMode == UIDatePickerModeDateAndTime &&
    _dummyPicker.preferredDatePickerStyle == UIDatePickerStyleInline) {
    UIDatePicker *timePicker = [UIDatePicker new];
    timePicker.datePickerMode = UIDatePickerModeTime;
    timePicker.preferredDatePickerStyle = UIDatePickerStyleInline;
    CGSize timeSize = [timePicker sizeThatFits:UILayoutFittingCompressedSize];
    size.height += timeSize.height;
  }
}

This measures the height of a time-only picker separately and adds it to the total height. With this change, the datetime nline picker displays correctly including the time picker row.

before	after

Note: I have only verified this fix with mode="datetime" + display="inline". I have not yet tested whether it affects
other mode/display combinations, so further testing may be needed.
sorry

[Scr3nt]

I made the fix and tested all modes.
Thanks!

[camcam-lemon]

Thank you fix!!