coa: fix "Show curable only" debuff filter for CoA custom classes

UnitAura "HARMFUL|RAID" only honours vanilla class dispel knowledge in
the 3.3.5 client — CoA custom classes (Chronomancer, Monk/Templar,
Prophet/Venomancer, etc.) were silently filtered to zero debuffs.

Fix: in updateGroup(), detect CoA dispellers via C_Player:IsCustomClass()
and store their per-class dispel set on group.coaRaidFilter instead of
appending |RAID.  scan() skips debuffs whose auraType is not in that
set, preserving contiguous button layout with no gaps.

Class → dispel types (sourced from coa-decursive):
  CHRONOMANCER  Magic/Curse/Disease/Poison (Roll Back 804490)
  MONK          Magic/Disease/Poison (Rebuke 525051)
  PROPHET       Poison (Antivenom 800905; curse-dispel doesn't fire)
  PYROMANCER    Disease/Poison
  RANGER        Disease/Poison
  CULTIST       Curse
  SONOFARUGAL   Curse
  SPIRITMAGE    Magic
  STARCALLER    Magic
  WITCHHUNTER   Curse

ShadowedUnitFrames/modules/auras.lua

@@ -1,6 +1,34 @@
 local Auras = {}
 local stealableColor = {r = 1, g = 1, b = 1}
 local playerUnits = {player = true, vehicle = true, pet = true}
+
+-- CoA: UnitAura "HARMFUL|RAID" only honours vanilla class dispels; custom classes
+-- need a manual type check.  playerCoaDispels is nil until first checked, false if
+-- the player is not a dispelling CoA class, or a {type=true} set if they are.
+local playerCoaDispels
+local COA_CLASS_DISPELS = {
+	["CHRONOMANCER"] = { Magic = true, Curse = true, Disease = true, Poison = true },
+	["MONK"]         = { Magic = true, Disease = true, Poison = true },
+	["PROPHET"]      = { Poison = true },
+	["PYROMANCER"]   = { Disease = true, Poison = true },
+	["RANGER"]       = { Disease = true, Poison = true },
+	["CULTIST"]      = { Curse = true },
+	["SONOFARUGAL"]  = { Curse = true },
+	["SPIRITMAGE"]   = { Magic = true },
+	["STARCALLER"]   = { Magic = true },
+	["WITCHHUNTER"]  = { Curse = true },
+}
+local function getCoaDispels()
+	if playerCoaDispels ~= nil then return playerCoaDispels end
+	local cp = _G.C_Player
+	if cp and cp.IsCustomClass and cp:IsCustomClass() then
+		local _, token = UnitClass("player")
+		playerCoaDispels = token and COA_CLASS_DISPELS[token] or false
+	else
+		playerCoaDispels = false
+	end
+	return playerCoaDispels
+end
 local mainHand, offHand = {time = 0}, {time = 0}
 local tempEnchantScan
 ShadowUF:RegisterModule(Auras, "auras", ShadowUF.L["Auras"])
@@ -309,7 +337,17 @@ local function updateGroup(self, type, config, reverseConfig)
 	-- This is a bit of an odd filter, when used with a HELPFUL filter, it will only return buffs you can cast on group members
 	-- When used with HARMFUL it will only return debuffs you can cure
 	if( config.raid ) then
+		local coa = group.type == "debuffs" and getCoaDispels()
+		if coa then
+			-- CoA custom class: keep filter as plain "HARMFUL" and let scan()
+			-- apply the per-type check via group.coaRaidFilter.
+			group.coaRaidFilter = coa
+		else
 			group.filter = group.filter .. "|RAID"
+			group.coaRaidFilter = nil
+		end
+	else
+		group.coaRaidFilter = nil
 	end
 	
 	for id, button in pairs(group.buttons) do
@@ -486,7 +524,7 @@ local function scan(parent, frame, type, config, filter)
 		local name, rank, texture, count, auraType, duration, endTime, caster, isStealable = UnitAura(frame.parent.unit, index, filter)
 		if( not name ) then break end
 		
-		if( ( not config.player or playerUnits[caster] ) and ( not parent.whitelist[type] and not parent.blacklist[type] or parent.whitelist[type] and parent.whitelist[name] or parent.blacklist[type] and not parent.blacklist[name] ) ) then
+		if( ( not frame.coaRaidFilter or (auraType and frame.coaRaidFilter[auraType]) ) and ( not config.player or playerUnits[caster] ) and ( not parent.whitelist[type] and not parent.blacklist[type] or parent.whitelist[type] and parent.whitelist[name] or parent.blacklist[type] and not parent.blacklist[name] ) ) then
 			-- Create any buttons we need
 			frame.totalAuras = frame.totalAuras + 1
 			if( #(frame.buttons) < frame.totalAuras ) then