feat: show numeric percentage on usage bars

[dundee]

closes #570

[codecov]

Codecov Report

❌ Patch coverage is 92.59259% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.66%. Comparing base (02225e4) to head (69bc6a0).

Files with missing lines	Patch %	Lines
tui/format.go	90.47%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #590      +/-   ##
==========================================
- Coverage   85.67%   85.66%   -0.01%     
==========================================
  Files          55       55              
  Lines        6019     6029      +10     
==========================================
+ Hits         5157     5165       +8     
- Misses        663      664       +1     
- Partials      199      200       +1     

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