feat: add text style editing support to tab bar theme editor

[zeshuaro]

Relate to #528

[codecov]

Codecov Report

Base: 96.94% // Head: 96.97% // Increases project coverage by +0.02% 🎉

Coverage data is based on head (afcc98d) compared to base (a42c308).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #548      +/-   ##
==========================================
+ Coverage   96.94%   96.97%   +0.02%     
==========================================
  Files         111      111              
  Lines        4127     4160      +33     
==========================================
+ Hits         4001     4034      +33     
  Misses        126      126              

Flag	Coverage Δ
appainter	97.30% <100.00%> (+0.02%)	⬆️
appainter_builder	78.37% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
lib/app_bar_theme/view/app_bar_theme_editor.dart	100.00% <ø> (ø)
lib/app_bar_theme/cubit/app_bar_theme_cubit.dart	100.00% <100.00%> (ø)
lib/tab_bar_theme/cubit/tab_bar_theme_cubit.dart	100.00% <100.00%> (ø)
lib/tab_bar_theme/view/tab_bar_theme_editor.dart	100.00% <100.00%> (ø)

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