NgoQuocViet2001 fd758b9e87 fix: preserve multi-page diagrams after export (#895) ...

* fix: preserve multi-page diagrams after export

* fix: keep chartXML sourced from autosave to preserve multi-page state

The export event's data.xml (xmlsvg format) contains compressed <diagram>
payloads, which would break applyDiagramOperations/replaceNodes consumers
that need plain <root> elements. Instead of writing export results into
chartXML, stop overwriting it entirely: autosave already delivers the full
uncompressed multi-page document, and loadDiagram covers AI-driven updates.

Also stop overwriting chartXMLRef with the page-only export before sending
a chat message, so session persistence never sees single-page XML.

Keep the data.xml preference for .drawio file downloads (compressed pages
are a valid drawio format).

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Co-authored-by: dayuan.jiang <jdy.toh@gmail.com>

2026-08-08 12:30:22 +09:00

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