Replace Nampower combat events with ClassicAPI events

Read casts from UNIT_SPELLCAST_* and heal amounts from
COMBAT_LOG_EVENT_UNFILTERED in libpredict, swingtimer and the prowl
page switch. Drop libdebuff's AURA_CAST/DEBUFF_* bookkeeping and hook
tables, which nothing read: its aura readers already use C_UnitAuras.
Drop the unitframe BUFF_ADDED_OTHER start-time tracker, since
C_UnitAuras stamps an expiration for auras seen being applied.

modules/actionbar.lua

@@ -897,6 +897,10 @@ pfUI:RegisterModule("actionbar", function ()
     pageswitch:RegisterEvent("UPDATE_SHAPESHIFT_FORM")
     pageswitch:RegisterEvent("PLAYER_AURAS_CHANGED")
     pageswitch:RegisterEvent("PLAYER_LOGOUT")
+    local PROWL_IDS = { [5215] = true, [6783] = true, [9913] = true }
+    if class == "DRUID" then
+      pageswitch:RegisterUnitEvent("UNIT_SPELLCAST_SUCCEEDED", "player")
+    end
     pageswitch:SetScript("OnEvent", function()
       if event == "PLAYER_LOGOUT" then
         this:UnregisterAllEvents()
@@ -919,6 +923,18 @@ pfUI:RegisterModule("actionbar", function ()
         return
       end
 
+      -- Eager prowl detection on the cast itself — zero-latency vs.
+      -- PLAYER_AURAS_CHANGED, which can land a frame or two behind it.
+      -- arg3 = spellID
+      if event == "UNIT_SPELLCAST_SUCCEEDED" then
+        if PROWL_IDS[arg3] then
+          inCatForm = true
+          prowlActive = true
+          formpaging = true
+        end
+        return
+      end
+
       if event == "UPDATE_SHAPESHIFT_FORM" then
         -- Authoritative form-change signal — recompute and short-circuit.
         inCatForm = HasCatForm()
@@ -942,20 +958,6 @@ pfUI:RegisterModule("actionbar", function ()
       end
     end)
 
-    -- Eager prowl detection via Nampower SPELL_GO_SELF — zero-latency vs.
-    -- PLAYER_AURAS_CHANGED, which can land a frame or two behind the cast.
-    -- Form changes are no longer hooked here; UPDATE_SHAPESHIFT_FORM covers
-    -- those without needing a per-spellID watchlist.
-    local PROWL_IDS = { [5215] = true, [6783] = true, [9913] = true }
-    pfUI.libdebuff_spell_go_hooks = pfUI.libdebuff_spell_go_hooks or {}
-    pfUI.libdebuff_spell_go_hooks["actionbar_prowl"] = function(spellId)
-      if class ~= "DRUID" then return end
-      if PROWL_IDS[spellId] then
-        inCatForm = true
-        prowlActive = true
-        formpaging = true
-      end
-    end
     pageswitch:SetScript("OnUpdate", function()
       -- switch actionbar page depending on meta key that is pressed
       if C.bars.pagemastershift == "1" and IsShiftKeyDown() then

modules/swingtimer.lua

@@ -635,25 +635,6 @@ pfUI:RegisterModule("swingtimer", function ()
     end
   end)
 
-  -- SPELL_GO hook via libdebuff: an on-next-swing ability (HS / Cleave /
-  -- Maul) resolving consumes the queue, so drop the queued color.
-  pfUI.libdebuff_spell_go_hooks = pfUI.libdebuff_spell_go_hooks or {}
-  pfUI.libdebuff_spell_go_hooks["swingtimer"] = function(spellId)
-    if IsOnSwingSpell(spellId) then
-      S.hsQueued = false; S.cleaveQueued = false; S.maulQueued = false
-    end
-  end
-
-  -- SPELL_CAST_EVENT hook: HS/Cleave/Maul queue tracking
-  pfUI.libdebuff_spell_cast_hooks = pfUI.libdebuff_spell_cast_hooks or {}
-  pfUI.libdebuff_spell_cast_hooks["swingtimer"] = function(success, spellId)
-    local kind = ClassifyOnSwingSpell(spellId)
-    if not kind then return end
-    S.useSpellQueueEvent = true
-    SetQueuedKind(kind)
-  end
-
-
   local events = CreateFrame("Frame")
   events:RegisterEvent("PLAYER_SWING")
   events:RegisterEvent("PLAYER_ENTERING_WORLD")
@@ -661,7 +642,9 @@ pfUI:RegisterModule("swingtimer", function ()
   events:RegisterEvent("PLAYER_REGEN_DISABLED")
   events:RegisterEvent("PLAYER_REGEN_ENABLED")
   events:RegisterEvent("ACTIONBAR_SLOT_CHANGED")
-  events:RegisterUnitEvent("UNIT_DIED", UnitGUID("player"))
+  events:RegisterEvent("PLAYER_DEAD")
+  events:RegisterUnitEvent("UNIT_SPELLCAST_SENT", "player")
+  events:RegisterUnitEvent("UNIT_SPELLCAST_SUCCEEDED", "player")
   events:RegisterEvent("SPELL_QUEUE_EVENT")
   events:RegisterEvent("START_AUTOATTACK")
   events:RegisterEvent("STOP_AUTOATTACK")
@@ -679,6 +662,21 @@ pfUI:RegisterModule("swingtimer", function ()
         StartRanged(arg1)
       end
 
+    elseif event == "UNIT_SPELLCAST_SENT" then
+      -- arg4 = spellID: an on-next-swing ability (HS / Cleave / Maul) queued
+      local kind = ClassifyOnSwingSpell(arg4)
+      if kind then
+        S.useSpellQueueEvent = true
+        SetQueuedKind(kind)
+      end
+
+    elseif event == "UNIT_SPELLCAST_SUCCEEDED" then
+      -- arg3 = spellID: the on-next-swing ability resolved, which consumes
+      -- the queue, so drop the queued color
+      if IsOnSwingSpell(arg3) then
+        S.hsQueued = false; S.cleaveQueued = false; S.maulQueued = false
+      end
+
     elseif event == "SPELL_QUEUE_EVENT" then
       local eventCode = arg1 or -1
       local spellId   = arg2 or 0
@@ -728,10 +726,8 @@ pfUI:RegisterModule("swingtimer", function ()
       S.cleaveQueued = false
       S.maulQueued   = false
 
-    elseif event == "UNIT_DIED" then
-      if IsPlayerGuid(arg1) then
-        ResetAll()
-      end
+    elseif event == "PLAYER_DEAD" then
+      ResetAll()
     end
   end)