Add more platform testing to CI

[complexspaces]

We should build out the infrastructure to test the "non-standard" platforms that we support in CI. These include:

• [ ] Android
• [x] iOS
• [x] WASM (in the browser)
• [x] Fallback provider for targets with no immediate support

This would give us greater confidence merging PRs not currently covered by CI and reduce the amount of manual testing required.