1. Sub-Tile Scatter Spacing (D2Common.dll COLLISION_GetFreeCoordinatesImpl 0x6FD9D140):
- Unify GameEngine.triggerMonsterDrop, GameEngine.dropItem, GameEngine.dropGold,
and net-scene monster drops on findIsometricDropPosition (16x8 sub-tile diamond
lattice, 16px orthogonal / 8px vertical spacing) instead of 80x40px macro cells.
- Derive GroundItemEntity (cellX, cellY) from final scattered (finalX, finalY)
via worldToCell rather than overwriting with stale origin cell coordinates.
2. Monster vs. Inventory Drop Metadata & Bilingual Name Parity:
- Add formatBilingualGroundItemName in src/game/ground-items.ts using
translateItemName / translateMagicName / translateRareName so raw monster-dropped
Item objects receive identical '中文名 (English Name)' nameZh as UiInventoryItem.
- Detect runes via isRuneCode in resolveItemQualityString so monster-dropped runes
render with #ff9c18 orange labels matching inventory-dropped runes.
- Preserve flippyFile, dropSound, and dropSfxFrame in itemToUiInventoryItem, fix
socket count resolution so unsocketed items do not inherit base.gemsockets, and
add embedded drop table fallback in resolveGroundItemMetadata.
3. Anti-Stacking for Sequential Player Inventory/Body Drops:
- Simplify act-scene onDropItemToGround / onDropGoldToGround to delegate directly
to engine.dropItem / engine.dropGold at (player.x, player.y) so every dropped
item checks engine.groundItems.all and scatters to a unique sub-tile slot.
Fixes#479
