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.xml

@@ -85,6 +85,7 @@
 			<Frame name="$parentICU" hidden="true" enableMouse="true"/>
 			<Frame name="$parentExpAmmo" hidden="true" enableMouse="true"/>
 			<Frame name="$parentChronometer" hidden="true" enableMouse="true"/>
+			<Frame name="$parentAnimations" hidden="true" enableMouse="true"/>
 			<Frame name="$parentCredits" hidden="true" enableMouse="true"/>
 
 			<!-- Top-right close button -->