feat: improve ios touch gesture

[LucasXu0]

• Expand the long press gesture hit test area.
• Adjust the selection gesture touch system to the new design.

zx.mp4

[codecov]

Codecov Report

Attention: 210 lines in your changes are missing coverage. Please review.

Comparison is base (07afd7a) 77.16% compared to head (cd6f9ff) 76.83%.

Files	Patch %	Lines
lib/src/render/selection/mobile_basic_handle.dart	0.00%	154 Missing ⚠️
.../src/render/selection/mobile_collapsed_handle.dart	0.00%	52 Missing ⚠️
...nt/service/selection/mobile_selection_service.dart	0.00%	2 Missing ⚠️
.../src/render/selection/mobile_selection_handle.dart	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #648      +/-   ##
==========================================
- Coverage   77.16%   76.83%   -0.34%     
==========================================
  Files         291      293       +2     
  Lines       12931    12961      +30     
==========================================
- Hits         9978     9958      -20     
- Misses       2953     3003      +50     

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