Add back stream idle mode

[lf94]

This will probably need to be tested more, but it's ready for a review!

[vercel]

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Name	Status	Preview	Updated (UTC)
modeling-app	🛑 Canceled (Inspect)		Feb 7, 2025 10:30pm

[qa-wolf]

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[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 10 lines in your changes missing coverage. Please review.

Project coverage is 86.01%. Comparing base (67e60cb) to head (41e7503).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/wasm-lib/kcl/src/settings/types/mod.rs	28.57%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5312      +/-   ##
==========================================
- Coverage   86.04%   86.01%   -0.03%     
==========================================
  Files          92       92              
  Lines       33250    33260      +10     
==========================================
  Hits        28609    28609              
- Misses       4641     4651      +10     

Flag	Coverage Δ
wasm-lib	86.01% <33.33%> (-0.03%)	⬇️

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