The grid windowed to ~4 viewports, dropping off-screen rows as it grew.
That broke large multi-selects: range/drag selection could not span past
trimmed cards, which silently vanished mid-scroll. Accumulate all loaded
rows for the visit instead; the grid is still cleared on sort/filter
change and on leaving the page (reset effect + section cache). Removes
the now-dead trim/anchor-refill fallbacks in loadMore/loadPrev.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
H1K0
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