[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/Auth/LegalViews.swift

@@ -1,5 +1,8 @@
 import SwiftUI
 import WebKit
+#if canImport(LCEssentials)
+import LCEssentials
+#endif
 
 private struct RemotePDFView: View {
     let url: URL
@@ -69,52 +72,32 @@ private struct LegalDocumentScreen: View {
     @State private var hasError = false
 
     var body: some View {
-        VStack(spacing: 0) {
-            screenHeader
+        LCENavigationView {
+            content
+        }
+        .setLeftButton(image: AnyView(AppBackButtonIcon())) { dismiss() }
+        .setTitle(text: Text(headerTitle).font(AppTypography.heading2).foregroundStyle(AppColors.textPrimary))
+    }
+
+    private var content: some View {
+        ZStack {
+            RemotePDFView(url: document.url, isLoading: $isLoading, hasError: $hasError)
+
+            if isLoading {
+                ProgressView()
+            }
+
+            if hasError {
+                VStack(spacing: 8) {
+                    Text("Não foi possível carregar \(title.lowercased()).")
+                        .font(AppTypography.body)
+                        .foregroundStyle(AppColors.textPrimary)
+                        .multilineTextAlignment(.center)
+                }
                 .padding(24)
-
-            ZStack {
-                RemotePDFView(url: document.url, isLoading: $isLoading, hasError: $hasError)
-
-                if isLoading {
-                    ProgressView()
-                }
-
-                if hasError {
-                    VStack(spacing: 8) {
-                        Text("Não foi possível carregar \(title.lowercased()).")
-                            .font(AppTypography.body)
-                            .foregroundStyle(AppColors.textPrimary)
-                            .multilineTextAlignment(.center)
-                    }
-                    .padding(24)
-                }
             }
         }
         .background((colorScheme == .dark ? Color.black : AppColors.backgroundLight).ignoresSafeArea())
-        .appHiddenNavigationBar()
-        .navigationBarBackButtonHidden(true)
-    }
-
-    private var screenHeader: some View {
-        ZStack {
-            Text(headerTitle)
-                .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()
-            }
-        }
     }
 }