shapeshift detection via GetShapeshiftFormID + UPDATE_SHAPESHIFT_FORM

actionbar.lua: pageswitch now listens to UPDATE_SHAPESHIFT_FORM as the
authoritative form-change signal. PLAYER_AURAS_CHANGED becomes a
narrowly-scoped prowl-detection trigger that runs after form state is
already known. The Nampower SPELL_GO_SELF hook drops its Cat Form
(spellID 768) branch — UPDATE_SHAPESHIFT_FORM covers form changes
without per-spellID watchlists. Prowl IDs stay hooked for zero-latency
detection that PLAYER_AURAS_CHANGED can't match.

autoshift.lua: the texture-list shapeshift detection becomes a form-ID-
keyed map. GetShapeshiftFormID returns the active form directly so we
don't have to texture-match against every possible form pattern. The
moonkin_scan frame disappears entirely — its talent-conditional was a
workaround for the agility buff sharing Moonkin's icon, which form ID
makes irrelevant (form 31 is only reported when the player is genuinely
in Moonkin Form). Loop also splits into two phases for clarity: mount
priority pass, then form cancel.

modules/actionbar.lua

@@ -949,11 +949,11 @@ pfUI:RegisterModule("actionbar", "vanilla", function ()
     -- setup page switch frame
     local prowling = nil
     local pageswitch = CreateFrame("Frame", "pfActionBarPageSwitch", UIParent)
-    pageswitch:RegisterEvent("PLAYER_AURAS_CHANGED")
     pageswitch:RegisterEvent("PLAYER_ENTERING_WORLD")
+    pageswitch:RegisterEvent("UPDATE_SHAPESHIFT_FORM")
+    pageswitch:RegisterEvent("PLAYER_AURAS_CHANGED")
     pageswitch:RegisterEvent("PLAYER_LOGOUT")
     pageswitch:SetScript("OnEvent", function()
-      -- Handle shutdown to prevent crash 132
       if event == "PLAYER_LOGOUT" then
         this:UnregisterAllEvents()
         this:SetScript("OnEvent", nil)
@@ -963,34 +963,38 @@ pfUI:RegisterModule("actionbar", "vanilla", function ()
 
       if class ~= "DRUID" then return end
 
-      -- On login/reload: full scan
       if event == "PLAYER_ENTERING_WORLD" then
         prowling = FullScan()
         return
       end
 
-      -- PLAYER_AURAS_CHANGED: smart scanning
-      if event == "PLAYER_AURAS_CHANGED" then
-        if prowlActive then
-          if IsStealthed() then
-            prowling = true
-          else
-            -- Prowl ended; recheck cat form (we might have shifted out entirely)
-            prowlActive = nil
-            prowling = nil
-            inCatForm = HasCatForm()
-          end
-        elseif not inCatForm then
-          -- Not in cat form, do a full scan (might have just shifted)
-          prowling = FullScan()
+      if event == "UPDATE_SHAPESHIFT_FORM" then
+        -- Authoritative form-change signal — recompute and short-circuit.
+        inCatForm = HasCatForm()
+        if not inCatForm then
+          prowlActive = nil
+          prowling = nil
+        end
+        return
+      end
+
+      -- PLAYER_AURAS_CHANGED: form changes already went through
+      -- UPDATE_SHAPESHIFT_FORM above; this handler only watches prowl on/off.
+      if inCatForm then
+        if IsStealthed() then
+          prowlActive = true
+          prowling = true
+        else
+          prowlActive = nil
+          prowling = nil
         end
-        -- If inCatForm but not prowlActive, no scan needed (wait for SPELL_GO_SELF hook)
       end
     end)
 
-    -- Prowl/CatForm detection via Nampower SPELL_GO_SELF hook (replaces UNIT_CASTEVENT)
-    -- Prowl Spell IDs: 5215 (Rank 1), 6783 (Rank 2), 9913 (Rank 3)
-    -- Cat Form Spell ID: 768
+    -- 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)
@@ -999,8 +1003,6 @@ pfUI:RegisterModule("actionbar", "vanilla", function ()
         inCatForm = true
         prowlActive = true
         prowling = true
-      elseif spellId == 768 then
-        inCatForm = true
       end
     end
     pageswitch:SetScript("OnUpdate", function()