feat: listen on delete_backward changes

[LucasXu0]

In some cases, the onDelete command doesn't trigger as expected, but at that time, Flutter will call performSelector instead.

[codecov]

Codecov Report

Attention: Patch coverage is 10.00000% with 18 lines in your changes missing coverage. Please review.

Project coverage is 72.30%. Comparing base (8582191) to head (a9b6743).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...component/service/ime/non_delta_input_service.dart	0.00%	18 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #898      +/-   ##
==========================================
- Coverage   72.38%   72.30%   -0.09%     
==========================================
  Files         317      317              
  Lines       14802    14822      +20     
==========================================
+ Hits        10715    10717       +2     
- Misses       4087     4105      +18     

Flag	Coverage Δ
	72.30% <10.00%> (-0.09%)	⬇️

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