Better ergonomics for build a WASM target.

[zzcgumn]

Currently building with config=wasm requires that a wasm target is specified. The normal pattern for building all targets fail as this will trigger an attempt to build the Python extension as a wasm binary which does not work.

[tameware]

Cursor built a cleaner WASM solution for me. I pushed it to https://github.com/tameware/dds/tree/wasm-refactor. It works on macOS, but I get an error running the Windows tests when I try to submit a PR:

clang: error: no such file or directory: '/std:c++20'

[zzcgumn]

Do we have any Windows user available to help with this build error? I am also on macOS. Claude managed to figure out how to solve a similar error message for me. Have you made the experiment to ask Cursor if it can figure it out?

[tameware]

I think I asked Cursor, but don't remember now. I'll ask again in the morning - I'm about to turn in.

[tameware]

The changes are now included in PR 163, where I added a web front end. Tho code passes all github's tests and is waiting for review.

#163