Speedup pixel stats

[raymondwjang]

🔍 Type of Change

🧪 Improvement: Enhancements or optimizations to existing code

📝 Description

• Trace frame update speed up x3 (2000 frames: 27s -> 8.5s)

🧪 Testing

• Unit tests
• Integration tests
• Existing tests update

🛠️ Dependencies

✅ Checklist

• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation

---

📚 Documentation preview 📚: https://cala--147.org.readthedocs.build/en/147/

[raymondwjang]

Before:

After:

[codecov]

Codecov Report

❌ Patch coverage is 96.66667% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 69.52%. Comparing base (d23f2f2) to head (3c193ff).
⚠️ Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
src/cala/nodes/overlap.py	92.68%	3 Missing ⚠️
src/cala/assets.py	77.77%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #147      +/-   ##
==========================================
+ Coverage   68.94%   69.52%   +0.58%     
==========================================
  Files          45       45              
  Lines        2428     2481      +53     
==========================================
+ Hits         1674     1725      +51     
- Misses        754      756       +2     

Flag	Coverage Δ
unittests	69.52% <96.66%> (+0.58%)	⬆️

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[raymondwjang]

pixel stats needs to be sparse

[raymondwjang]

Some Obscure Milestone: (hit 10 fps)

[raymondwjang]

down to 140 seconds without the profiler overhead