UI - Higher density widget

[nopdive]

We're wasting too many pixels on having a separate metrics bar. Controls and metrics (which are horizontal scrollable) are now in the same bar.

Additional changes:

• Metrics are contextual. I.e. GPU / CPU usage is reported only while the cell is running, while token reduction and related are shown at completion.
• Fix for memory metrics (was percentage, now in GB).
• Metrics provide more description on hover. We have very short one word metrics, which has plenty of ambiguity as a sacrifice to reduce horizontal space.

Shout-outs to Jingya & Nick (high-density sketches, frontend discussion)!

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 41.66667% with 7 lines in your changes missing coverage. Please review.

Project coverage is 54.14%. Comparing base (788b468) to head (321423b).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
guidance/models/_model.py	44.44%	5 Missing ⚠️
guidance/visual/_renderer.py	33.33%	2 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1127       +/-   ##
===========================================
+ Coverage   43.18%   54.14%   +10.95%     
===========================================
  Files          70       70               
  Lines        5777     5777               
===========================================
+ Hits         2495     3128      +633     
+ Misses       3282     2649      -633     

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[nking-1]

Looks great. I like the compressed bar. Very nice!

Code looks good too.