match rendering capability of existing imgui web frontend

[luxe]

basically we are already on the roadmap from unilang transcompiling to protobuf and imgui display/transformers. Targeting desktop will b easy. we want the same thing in webassembly.
This person nailed it:
https://greggman.github.io/doodles/glfw-imgui/out/glfw-imgui.html
We'll want to make sure we can get similar artifacts under a more production bazel context.
basically, lets make sure we can bazel build a similar web fronted

[luxe]

emsdk has an upstream emscripten toolchain for bazel. This repo now has an example that works correctly to run imgui. Good start, just need to make sure all the other c++ unilang code and be converted to wasm. Might have to do some bazel platform stuff.