Diffing RenderedElem trees to produce VDomPatch (#3104)

Pull request created by AI Agent

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: sawka <2722291+sawka@users.noreply.github.com>

Author: Copilot