Mounts markers with client:only/load/visible/idle, and disposes roots on
route change so React roots, detached DOM, and store subscriptions do
not leak across client-side navigation.
Bundle load failures and malformed props JSON degrade to a warning and
leave the server markup intact rather than taking down the page.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
ClintchizandClaude Opus 5
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