fix(highlight): manual debuff scan for CoA dispel classes

UnitDebuff(unit, 1, "RAID") ignores CoA custom classes, so on a
Witchdoctor/Templar/etc. hasDebuff was always nil and the unit-frame
border highlight never lit up on curable Poison/Disease/Magic/Curse.

Fix mirrors the auras.lua shim: if ShadowUF.GetCoaDispels() returns a
dispel set, scan UnitDebuff entries manually and match by dispelType.
Expose getCoaDispels on the ShadowUF namespace so highlight.lua can
reuse the single source of truth (COA_CLASS_DISPELS lives in auras.lua).

ShadowedUnitFrames/modules/auras.lua

@@ -40,6 +40,8 @@ local function getCoaDispels()
 	end
 	return playerCoaDispels
 end
+-- Expose for other modules (highlight.lua) so the dispel set stays single-source.
+ShadowUF.GetCoaDispels = getCoaDispels
 local mainHand, offHand = {time = 0}, {time = 0}
 local tempEnchantScan
 ShadowUF:RegisterModule(Auras, "auras", ShadowUF.L["Auras"])

ShadowedUnitFrames/modules/highlight.lua

@@ -150,6 +150,29 @@ end
 
 function Highlight:UpdateAura(frame)
 	-- In theory, we don't need aura scanning because the first debuff returned is always one we can cure... in theory
-	frame.highlight.hasDebuff = UnitIsFriend(frame.unit, "player") and select(5, UnitDebuff(frame.unit, 1, "RAID")) or nil
+	if not UnitIsFriend(frame.unit, "player") then
+		frame.highlight.hasDebuff = nil
+		return self:Update(frame)
+	end
+
+	-- CoA: "RAID" filter doesn't know about custom dispel classes (Witchdoctor, Templar, …);
+	-- if the player is one of those, scan all debuffs and match against our dispel set.
+	local coaDispels = ShadowUF.GetCoaDispels and ShadowUF.GetCoaDispels()
+	if coaDispels then
+		local hit
+		local i = 1
+		while true do
+			local name, _, _, _, dispelType = UnitDebuff(frame.unit, i)
+			if not name then break end
+			if dispelType and coaDispels[dispelType] then
+				hit = dispelType
+				break
+			end
+			i = i + 1
+		end
+		frame.highlight.hasDebuff = hit
+	else
+		frame.highlight.hasDebuff = select(5, UnitDebuff(frame.unit, 1, "RAID")) or nil
+	end
 	self:Update(frame)
 end