test(e2e): poll for initial shrink-to-fit zoom before asserting

[ochafik]

Deflakes pdf-viewer-zoom.spec.ts:67 — ~6 failures in the 30 runs since #583.

The initial fit-to-width measures container.clientWidth immediately after showViewer() flips display:flex. Under CI load the reflow can lag a tick, leaving widthFit >= 1.0 and zoom at 100% when first read, which intermittently fails the toBeLessThan(100) assertion.

Swap the single-shot read for expect.poll, matching the pattern already used for the post-fullscreen assertion a few lines below, then capture inlineZoom for the subsequent comparison.

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commit: f8b38fb