Add Animations feature + fix own-pet tooltip false positive

Animations (all optional, default on, per-effect toggles):
- New Options -> Animations tab with master switch + per-effect checkboxes
- Embed PizzaSauce animation library (api/PizzaSauce.lua)
- fx-celebrate: firework + banner when a pet learns a new ability/rank,
  triggered from core-scan-beasttraining pet-learn hook
- Hunter's Book: slide + fade on open, results list fade on tab switch
- Options window: slide + fade on open
- All new user-facing strings keyed (ANIM_* namespace)

Fixes:
- Tooltip #19: own-pet lines (mood/loyalty/happiness/XP) no longer
  misfire on party members / targets. Removed the fragile title-name
  fallback in MTH_TT_IsTooltipOnOwnPet; ownership now requires positive
  unit identity.

Temp (remove before release): /mth fx and /mth fxdebug diagnostics.

api/options-shell.lua

@@ -20,6 +20,16 @@ local function MTH_OPT_L(key, default)
 	return default or key
 end
 
+-- Capture our PizzaSauce instance for the options-window open animation (guarded).
+local MTH_OPT_Sauce = PizzaSauce
+local function MTH_OPT_AnimateOpen(frame)
+	if not MTH_OPT_Sauce or not frame then return end
+	if type(MTH_FX_IsEnabled) == "function" and not MTH_FX_IsEnabled("ui.options") then return end
+	-- Hide alpha this frame so there is no one-frame opaque flash before onStart.
+	if type(frame.SetAlpha) == "function" then frame:SetAlpha(0) end
+	MTH_OPT_Sauce:SlideIn(frame, "UP", 60, 0.4, "outCubic")
+end
+
 local function MTH_RegisterEscClose(frameName)
 	if not (frameName and UISpecialFrames) then
 		return
@@ -232,6 +242,13 @@ function MTH_SelectOptionsTab(tabKey)
 		elseif MTH and MTH.Print then
 			MTH:Print("ICU options setup function is not loaded", "error")
 		end
+	elseif tabKey == "Animations" then
+		if not MTH_OPTIONS_SETUP["Animations"] then
+			if type(MTH_SetupAnimationsOptions) == "function" then
+				MTH_SetupAnimationsOptions()
+				MTH_OPTIONS_SETUP["Animations"] = true
+			end
+		end
 	elseif tabKey == "Credits" then
 		local setupCredits = _G and _G["MTH_SetupCreditsOptions"]
 		if type(setupCredits) == "function" then
@@ -324,6 +341,7 @@ function MTH_OpenOptions(tabKey)
 		return
 	end
 	optionsFrame:Show()
+	MTH_OPT_AnimateOpen(optionsFrame)
 	if MTH_OPTIONS_UpdateRealmGateOverlay(optionsFrame) then return end
 	MTH_SelectOptionsTab(tabKey or "General")
 end