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Recover from REACTIVITY_HALTED in dev workflows

A halt is global to the runtime instance, so one uncaught error used to
permanently brick HMR (hot swaps are signal writes, which a halted
scheduler drops) and playground-style embedders (a fresh render() never
mounts because its queued effects can never flush) until a full reload.
The refresh runtime now revives scheduling before patching a hot update,
and render() resets the halt in dev before mounting; resetErrorHalt is
re-exported from solid-js (server no-op) for dev tooling. Production
behavior is unchanged: a halt remains a hard crash.

Co-authored-by: Cursor <cursoragent@cursor.com>

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