Move vote animation to Customize tab as persistent user setting

Replace random animation selection with a user-configurable picker on
the Customize tab between Mood Style and Notifications. Confetti is
the default. Selecting a style shows an inline preview that auto-plays
the animation then dismisses itself. Remove Animation Lab from Settings.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Shared/Analytics.swift

@@ -390,6 +390,7 @@ extension AnalyticsManager {
         case moodShapeChanged(shapeId: Int)
         case personalityPackChanged(packTitle: String)
         case appIconChanged(iconTitle: String)
+        case celebrationAnimationChanged(animation: String)
 
         // MARK: Widget
         case widgetViewed
@@ -498,6 +499,8 @@ extension AnalyticsManager {
                 return ("personality_pack_changed", ["pack_title": title])
             case .appIconChanged(let title):
                 return ("app_icon_changed", ["icon_title": title])
+            case .celebrationAnimationChanged(let animation):
+                return ("celebration_animation_changed", ["animation": animation])
 
             // Widget
             case .widgetViewed: