Fix chat sent button not showing

[gnunicorn]

1. Send button not showing.
2. Unable to do new line.
3. TextEditor doesn't expanded with more content like paragraph.
4. Message draft also details last character of message even though we clear editor.

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 47.09%. Comparing base (aaa8a17) to head (bdbc227).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
...tures/chat_ng/widgets/chat_editor/chat_editor.dart	66.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3172      +/-   ##
==========================================
+ Coverage   46.97%   47.09%   +0.12%     
==========================================
  Files         949      949              
  Lines       57940    57941       +1     
==========================================
+ Hits        27219    27290      +71     
+ Misses      30721    30651      -70     

Flag	Coverage Δ
integration-test	58.09% <ø> (+0.05%)	⬆️
unittest	39.82% <66.66%> (+0.16%)	⬆️

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