[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/ProductDetailSheet.swift

@@ -1,5 +1,8 @@
 import Foundation
 import SwiftUI
+#if canImport(LCEssentials)
+import LCEssentials
+#endif
 
 struct ProductDetailSheet: View {
     let product: StoreCatalogProduct
@@ -70,9 +73,16 @@ struct ProductDetailSheet: View {
     }
 
     var body: some View {
+        LCENavigationView {
+            content
+        }
+        .setLeftButton(image: AnyView(AppBackButtonIcon())) { dismiss() }
+        .setTitle(text: Text("Detalhes").font(AppTypography.heading2).foregroundStyle(AppColors.textPrimary))
+    }
+
+    private var content: some View {
         ScrollView(showsIndicators: false) {
             VStack(alignment: .leading, spacing: 16) {
-                screenHeader
                 AsyncStoreImage(imageURL: imageURL)
                     .frame(height: 220)
                     .clipShape(RoundedRectangle(cornerRadius: AppLayout.radiusXL, style: .continuous))
@@ -243,26 +253,6 @@ struct ProductDetailSheet: View {
         }
     }
 
-    private var screenHeader: some View {
-        ZStack {
-            Text("Detalhes")
-                .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 formatCurrency(_ value: Double) -> String {
         String(format: "R$ %.2f", value).replacingOccurrences(of: ".", with: ",")