Add wasm32 support (async renderer resume)

#426 in DioxusLabs/blitz — merged 2026-05-10

Adds View::resume_async and a BlitzWasmApplication driver so blitz can run on wasm32-unknown-unknown without pollster::block_on deadlocking the JS event loop on wgpu init; examples/wasm_hello is a minimal Trunk-served demo. Draft pending DioxusLabs/anyrender#59 — the [patch.crates-io] git deps will be swapped for crates.io versions once that PR merges and the new anyrender crates are released.