fix: cancel block selection when tapping the editor on mobile

[LucasXu0]

Tapping on mobile to select text should cancel the block selection.

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 72.19%. Comparing base (cca5c41) to head (452d84b).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/src/editor_state.dart	83.33%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #956   +/-   ##
=======================================
  Coverage   72.19%   72.19%           
=======================================
  Files         318      318           
  Lines       15089    15093    +4     
=======================================
+ Hits        10893    10897    +4     
  Misses       4196     4196           

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