[lcenavigationview-adoption] Adopt LCENavigationView across 15 screens

Standardizes the back button to a single shared component
(AppBackButtonIcon, 32x32/14pt) instead of ~16 hand-duplicated
52x52/24pt copies, and wires each screen through LCENavigationView
per this project's mandatory-usage rule. Home and Store Detail
intentionally excluded - both have bespoke header designs (collapsing
header, hero-image overlay) this change would visually disrupt.

PediFoods/Views/Main/PizzaFlavorAddonsSheet.swift

@@ -1,5 +1,8 @@
 import Foundation
 import SwiftUI
+#if canImport(LCEssentials)
+import LCEssentials
+#endif
 
 struct PizzaFlavorAddonsSheet: View {
     let flavor: StoreCatalogProduct
@@ -8,9 +11,16 @@ struct PizzaFlavorAddonsSheet: View {
     @Environment(\.dismiss) var dismiss
 
     var body: some View {
+        LCENavigationView {
+            content
+        }
+        .setLeftButton(image: AnyView(AppBackButtonIcon())) { dismiss() }
+        .setTitle(text: Text("Adicionais").font(AppTypography.heading2).foregroundStyle(AppColors.textPrimary))
+    }
+
+    private var content: some View {
         ScrollView(showsIndicators: false) {
             VStack(alignment: .leading, spacing: 12) {
-                screenHeader
                 Text(flavor.name)
                     .font(AppTypography.heading2)
                     .foregroundStyle(AppColors.textPrimary)
@@ -82,26 +92,6 @@ struct PizzaFlavorAddonsSheet: View {
         .navigationBarBackButtonHidden(true)
     }
 
-    private var screenHeader: some View {
-        ZStack {
-            Text("Adicionais")
-                .font(AppTypography.heading2)
-                .foregroundStyle(AppColors.textPrimary)
-            HStack {
-                Button(action: { dismiss() }) {
-                    Image(systemName: "chevron.left")
-                        .font(.system(size: 24, weight: .semibold))
-                        .foregroundStyle(AppColors.textPrimary)
-                        .frame(width: 52, height: 52)
-                        .background(AppColors.surface)
-                        .clipShape(Circle())
-                        .shadow(color: .black.opacity(0.06), radius: 8, y: 2)
-                }
-                .buttonStyle(.plain)
-                Spacer()
-            }
-        }
-    }
 
     private func increment(_ addonId: String) {
         quantities[addonId, default: 0] += 1