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CI flagged two browser tests:
- "renders a G{n} label per occupied generation row …"
- "wraps the visible G3 text inside an aria-labelled group …"
Both queried g[role="text"] and got an empty array. Root cause:
isMdOrUp was initialised to false and only flipped to true inside a
$effect — but $effect runs after the first render, so the test's
post-render DOM scan saw the pre-effect (gutter-absent) state.
Seed the rune synchronously from window.matchMedia(...).matches when
window is available; SSR still picks the false branch and hydrates
without a layout flash. The effect now only attaches the change
listener for subsequent resizes.
Refs #689
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>