- `overflow-clip` gets a safelist anchor in index.css (its only occurrence is a `.ts` constant),
and the chip-lane contract keeps it there.
- PlexPlayer's Backspace ownership rule is pinned on all three branches: nothing above, a foreign
layer above (it defers), and its own panel open under a layer (it still closes the panel).
- Removing a playlist item bumps the list's `updated_at`, like the three other item-only writes.
- Seen in a real browser on localdev: an exhausted comfort-shelf tile (an empty pinned playlist) is
focusable, aria-disabled, and its Shift+F10 menu offers Play off and Remove from shelf.
peter
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