refactor: TypeScript types + production build

[timkurvers]

#44 introduced raw TypeScript support, but did not fix any of the types.

In this PR:

• Proper TypeScript types used across all files
  • Found 1044 errors in 69 files This is now zero 🥳
• Partial external vendor type definitions (fengari and @wowserhq/math)
• Verify production build (in particular the generated filenames)
• Verify test coverage

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (7355ac0) 0.00% compared to head (24c8edb) 0.00%.

Files	Patch %	Lines
src/gfx/apis/webgpu/WebGPUDevice.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main     #45     +/-   ##
=======================================
  Coverage   0.00%   0.00%             
=======================================
  Files         83      14     -69     
  Lines       3841     495   -3346     
  Branches     564       0    -564     
=======================================
+ Misses      3838     495   -3343     
+ Partials       3       0      -3     

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