Animations: wire remaining effects + 2-column options panel

- Shared FX toolkit in fx-celebrate.lua: mth_shake tween type, MTH_FX_Flash
  glow helper, MTH_CelebrateRunaway red shaking banner, gold title reset.
- pet.runaway, pet.happiness, pet.loyaltyup, pet.feed
- combat.ammoswap, combat.rangedswap, combat.mmprocs
- ui.zbar, ui.stable, ui.minimapping, ui.optionsclose
- book.model, book.search
- Options > Animations panel now uses a balanced two-column layout.
- CHANGELOG Animations entry expanded (no version bump).

api/hunterbook-model-viewer.lua

@@ -6,6 +6,18 @@
 -- Uses MTH_DS_BeastSkins[familyName] generated by .tools/generators/gen_beast_skins.py
 -- Skin rendering: PlayerModel:SetUnit(CreatureDisplayInfo.ID)
 
+local MTH_MV_Sauce = PizzaSauce
+
+-- Fade a model frame in when a new skin is displayed, unless disabled.
+local function MTH_MV_AnimateModel(model)
+	if not MTH_MV_Sauce or not model then return end
+	if type(MTH_FX_IsEnabled) == "function" and not MTH_FX_IsEnabled("book.model") then return end
+	if type(model.SetAlpha) ~= "function" then return end
+	if not model:IsShown() then return end
+	model:SetAlpha(0)
+	MTH_MV_Sauce:FadeTo(model, 1, 0.30, "outQuad")
+end
+
 local MTH_MV = {
 	inited           = false,
 	family           = nil,
@@ -51,6 +63,8 @@ local function MTH_MV_DisplayCurrent()
 
 	MTH_MV_ApplyModel(MTH_MV.previewModel, skin.id)
 	MTH_MV_ApplyModel(MTH_MV.popupModel,   skin.id)
+	MTH_MV_AnimateModel(MTH_MV.previewModel)
+	MTH_MV_AnimateModel(MTH_MV.popupModel)
 
 	local indexStr = tostring(MTH_MV.index) .. " / " .. tostring(n)
 	if MTH_MV.popupSkinLabel then