Skin the CoA Wardrobe tab (AppearanceWardrobeFrame)

Outer panel, close button, and the top-left portrait medallion get the
same first-pass treatment as Vanity/Talent, plus the item collection
panel: native background/border art stripped from Collection and its
InsetOverlay/ShadowOverlay decoration, the 3D model preview's vanilla
border removed, and the action buttons, search box, Filter/Order By
dropdowns, page arrows, and category tabs skinned to match.

Left native for a later pass: the icon grid contents, item slot
buttons, and character model itself.

core.lua

@@ -386,6 +386,10 @@ function CoA:Initialize()
 	if self.InitializeVanityFrame then
 		self:InitializeVanityFrame()
 	end
+
+	if self.InitializeWardrobeFrame then
+		self:InitializeWardrobeFrame()
+	end
 end
 
 local function InitializeCallback()