feat: hide ai btn when zeroclaw is disabled

[iamazy]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 60.52632% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.20%. Comparing base (46c5089) to head (778c209).

Files with missing lines	Patch %	Lines
termua/src/menu.rs	0.00%	8 Missing ⚠️
termua/src/footbar/mod.rs	75.86%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #28      +/-   ##
==========================================
- Coverage   54.21%   54.20%   -0.01%     
==========================================
  Files         160      160              
  Lines       54798    54823      +25     
==========================================
+ Hits        29707    29719      +12     
- Misses      25091    25104      +13     

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