fix: mobile selection scroll should work on both side

[LucasXu0]

closes #218

[LucasXu0]

FYI, @alihassan143

[codecov]

Codecov Report

Merging #220 (3bc708d) into main (2d3ab80) will decrease coverage by 0.02%.
The diff coverage is 44.44%.

@@            Coverage Diff             @@
##             main     #220      +/-   ##
==========================================
- Coverage   62.66%   62.65%   -0.02%     
==========================================
  Files         230      230              
  Lines       10262    10267       +5     
==========================================
+ Hits         6431     6433       +2     
- Misses       3831     3834       +3     

Impacted Files	Coverage Δ
...nt/service/selection/mobile_selection_service.dart	0.00% <0.00%> (ø)
...ditor_component/service/scroll_service_widget.dart	81.08% <60.00%> (-2.02%)	⬇️
...mponent/service/scroll/auto_scrollable_widget.dart	94.44% <100.00%> (+5.55%)	⬆️