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claude 71755e5cee
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fix(pdf): replace document.startViewTransition with non-blocking canvas fade
document.startViewTransition with an async callback places a ::view-transition
overlay on top of the entire page, intercepting pointer events for the duration
of the callback (up to the 1s safety timeout + 250ms animation).  With rapid
auto-compiles this created interface freezes and overlapping transitions that
could leave the visual lock in a broken state, causing 'stuck on compiling'.

Replace with a canvas snapshot overlay + CSS opacity fade-out:
- pointer-events:none so the overlay never blocks input
- snapshot covers the canvas-clear from setDocument() (no white flash)
- on pagerendered: opacity transitions to 0 over 250ms, then overlay removed
- gives the same smooth visual crossfade, reliably, in all browsers

Chrome 126+ retains the element-level startViewTransition path which is
scoped to the PDF container and does not affect the rest of the page.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-06-07 13:09:18 +00:00
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