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- Tiles are focusable (tabindex / role=button / aria-label) with a :focus-visible ring; Enter opens the lightbox (or toggles in selection mode), Space toggles selection. - Shift-click extends the selection from the last anchor across the timeline; the range is tracked in the selection Set so it spans dematerialized (off-screen) groups, with visible tiles updated at once. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01JW6ghFMDtnRYuYNzZhb47M