Fix two autotune issues on wasm

[ArthurBrussee]

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Changes

On WASM autotuning is async, and until the results are in, it needs to use a default setting. ATM it just picks the first one, which atm uses atomic floats, and thus results in an error.

For convolution, it needed to simply bubble up the cube count too large error rather than panic'ing.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.33%. Comparing base (a1ca434) to head (07e6c4f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2899      +/-   ##
==========================================
- Coverage   82.33%   82.33%   -0.01%     
==========================================
  Files         868      868              
  Lines      118565   118563       -2     
==========================================
- Hits        97617    97615       -2     
  Misses      20948    20948              

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[laggui]

Thanks for keeping us in sync with wasm 😄