fix: scroll to event seq

[mdjastrzebski]

Summary

user.scrollTo() skipped the scroll event for the last drag step, unlike native ScrollView. Because FlatList reads its offset from onScroll, it ended up at 75% of the target, which threw off onEndReached and windowing.

• Drag now emits scroll for every step, including the last.
• A scroll that doesn't move emits no scroll for drag or momentum.
• Updated the comments and the 14.x docs.

Test plan

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.56%. Comparing base (7e25db3) to head (76d9742).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1943   +/-   ##
=======================================
  Coverage   98.56%   98.56%           
=======================================
  Files          87       87           
  Lines        1744     1744           
  Branches      474      473    -1     
=======================================
  Hits         1719     1719           
  Misses         24       24           
  Partials        1        1           

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