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/Views/SettingsView/SettingsView.swift

@@ -62,8 +62,6 @@ struct SettingsContentView: View {
                 privacyButton
                 analyticsToggle
 
-                animationLabButton
-
                 #if DEBUG
                 // Debug section
                 debugSectionHeader
@@ -200,47 +198,6 @@ struct SettingsContentView: View {
         .padding(.horizontal, 4)
     }
 
-    // MARK: - Animation Lab
-
-    @State private var showAnimationLab = false
-
-    private var animationLabButton: some View {
-        Button {
-            showAnimationLab = true
-        } label: {
-            HStack(spacing: 12) {
-                Image(systemName: "sparkles")
-                    .font(.title2)
-                    .foregroundColor(.purple)
-                    .frame(width: 32)
-
-                VStack(alignment: .leading, spacing: 2) {
-                    Text("Animation Lab")
-                        .foregroundColor(textColor)
-
-                    Text("Experiment with vote celebrations")
-                        .font(.caption)
-                        .foregroundStyle(.secondary)
-                }
-
-                Spacer()
-
-                Image(systemName: "chevron.right")
-                    .font(.caption)
-                    .foregroundStyle(.tertiary)
-            }
-            .padding()
-        }
-        .background(theme.currentTheme.secondaryBGColor)
-        .fixedSize(horizontal: false, vertical: true)
-        .cornerRadius(Constants.viewsCornerRaidus, corners: [.topLeft, .topRight, .bottomLeft, .bottomRight])
-        .sheet(isPresented: $showAnimationLab) {
-            NavigationStack {
-                DebugAnimationSettingsView()
-            }
-        }
-    }
-
     // MARK: - Debug Section
 
     #if DEBUG