The overlay's auto-save implementation arrives via a dynamic import that
races the first React commit. A hook whose mount effect ran before the
overlay chunk evaluated saw installedImpl === null and stayed idle for
the whole life of the tab: no debounced saves, no beforeunload flush,
with no visible symptom. Any tab that hard-loaded straight into the
editor and never remounted it silently lost every edit made after the
project was bound.
installAutoSaveImpl now wakes hooks that mounted before it ran, so the
implementation starts as soon as it exists. Swapping a live impl at
runtime remains unsupported.
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