The refactor made pdfDoc a plain variable so renderer.isLoaded was not
reactive. Svelte only tracked currentPage and scale — but when the canvas
reappeared after loading, neither changed, so the PDF stayed blank.
Fix: merge the two effects into one that reads canvasEl synchronously.
Svelte now tracks canvasEl as a dependency; when the canvas remounts
(loading spinner → false), the effect re-fires and renders the
already-loaded PDF document.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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