Brainstorm output for B-Drag. Drop an inventory item: empty grid slot ->
first empty; on an item -> insert before; on a side-bag cell -> into that
container. Green insert-arrow (valid) / red circle (full). Movement is
OPTIMISTIC/instant per the user — local MoveItem on drop + repaint, server
reconciles via 0x0022 echo, rolls back via 0x00A0 (the rollback the B-Wire
note reserved). InventoryController : IItemListDragHandler; pending-move
tracking in ClientObjectTable (Core, reachable from the Core.Net handlers);
SendPutItemInContainer wraps BuildPickUp 0x0019. Retail anchors: InqDropIconInfo
0x004e26f0 / ItemList_InsertItem / HandleDropRelease / ServerSaysMoveItem.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
