UpdateSlot previously created the glow texture and OnEnter acknowledge
hook on the first pass over every slot, then toggled visibility. Move
both inside the "is new" branch so a slot only allocates when it actually
holds a new item -- most bag/bank slots never do. Behavior is unchanged:
the glow is still created once per slot and reused, and the hook is
installed exactly when it's first needed.
New module built on ClassicAPI's C_NewItems + BAG_NEW_ITEMS_UPDATED.
Glows bag slots (bags 0-4) holding items acquired since login, keyed on
item GUID so the flag survives rearranging. Hovering an item
acknowledges it (RemoveNewItem); closing the bags clears the rest via
ClearAll. Glow is UI-ActionButton-Border, sized off the slot width so it
tracks the icon_size config.
To stay decoupled from the bag frames, the bag module now broadcasts a
reusable "bag:closed" event through pfUI.events from its OnHide (carrying
the container so subscribers can tell backpack from bank), guarded so the
initial setup Hide() doesn't fire a phantom close.
Config: appearance.bags.newitem + newitem_color, with GUI toggles.