The template-load sequence (clear canvas -> add components -> add
pages -> apply header/footer) ran as a chain of setTimeout callbacks,
but onClose() fired synchronously right after kicking it off. The
modal disappeared immediately, so "Loading..." never had a chance to
show, and the staged mutations kept running against a dialog the
caller had already dismissed.
Convert the staged steps to async/await (a promise-based `wait()`
replaces the setTimeout chaining) and only call onClose() in a
finally block once the whole sequence has settled. Add a mountedRef
guard so the trailing setLoading(false) is skipped if the component
happens to unmount mid-sequence. End result (pages/header/footer/
design applied) is unchanged.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
shadowdao
7973ee9ba8