feat: add footbar theme toggle

[iamazy]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 42.00000% with 29 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.72%. Comparing base (8a6e618) to head (3f37881).

Files with missing lines	Patch %	Lines
crates/termua_zeroclaw/src/lib.rs	0.00%	13 Missing ⚠️
termua/src/update.rs	0.00%	6 Missing ⚠️
crates/gpui_dock/src/tiles.rs	0.00%	5 Missing ⚠️
termua/src/footbar/mod.rs	80.76%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #70      +/-   ##
==========================================
- Coverage   59.72%   59.72%   -0.01%     
==========================================
  Files         162      162              
  Lines       60705    60734      +29     
==========================================
+ Hits        36257    36273      +16     
- Misses      24448    24461      +13     

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