Add Growl pet auto-teach feature and smooth zButton expand animation

- New Pet Auto-Teach: on tame, offer to teach Growl at the best rank via the
  Beast Training window (Craft API DoCraft), with a General options checkbox
  and /mth growl on|off|status toggle (on by default).
- De-stagger zButton flyout bars and zBar so buttons fade in together.
- Update CHANGELOG.

modules/zhunter/ZSpellButtonTemplate.lua

@@ -418,11 +418,9 @@ function ZSpellButton_SetChildrenExpanded(parent, expanded)
 			end
 		end
 		ZSpellButton_StartFadeTimer(parent)
-		-- Animate only on a genuine collapsed->expanded toggle, and never on the
-		-- very first apply at login (guarded by _zbAnimReady, set in ApplyChildrenExpanded).
-		if wasCollapsed and parent._zbAnimReady then
-			ZSpellButton_AnimateExpand(parent)
-		end
+		-- Flyout reveal is instant: no stagger/cascade animation. The staggered
+		-- "stacking one after the other" fly-out was slow and unwanted, so the
+		-- children just appear immediately when expanded.
 	else
 		saved["children"]["expanded"] = 0
 		if parent.children then