6 tasks: (1) UiItemList clip+scroll via the shared UiScrollable + whole-row
clip; (2) mouse-wheel; (3) InventoryController binds the gutter scrollbar
0x100001C7 like ChatWindowController; (4) side-bag column 36px pitch + empty-
slot padding to capacity; (5) backdrop coverage — screenshot-gated, primary
fix is the clip; (6) verify + bookkeeping. TDD on the pure/controller logic
(internals test-visible); backdrop is the visual gate. Grounded in the dat
dumps + the existing scroll/scrollbar machinery.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
