Improve progress bar display

[mdekstrand]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 36.11111% with 23 lines in your changes missing coverage. Please review.

Project coverage is 90.23%. Comparing base (0823c7d) to head (4315942).
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
lenskit/lenskit/logging/progress/_rich.py	32.35%	23 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #545      +/-   ##
==========================================
- Coverage   90.37%   90.23%   -0.15%     
==========================================
  Files          98       98              
  Lines        5738     5755      +17     
==========================================
+ Hits         5186     5193       +7     
- Misses        552      562      +10     

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