Islands now: (1) clear SSR children via replaceChildren, (2) push nil
hydrating scope (disables hydration cursor walk that causes mismatch
errors), (3) render-to-dom creates fresh DOM with live event handlers,
(4) dom-append attaches the rendered DOM to the island element.
This fixes the hydrate-mismatch:div error caused by SSR/client attribute
differences (~tw generates different class strings server vs client).
NOTE: needs WASM rebuild (sx_build target=wasm) to compile boot.sxbc.
The .sx source is updated but the bytecoded module is stale.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
giles
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