[lcenavigationview-adoption] Suppress glass button chrome via .buttonStyle(.plain)

Cascades .buttonStyle(.plain) down from each LCENavigationView
instance instead of waiting on the LCEssentials package fix
(committed separately, unpublished: LC_Essentials commit 8b0f650) to
be released and this repo's Package.resolved bumped. Overrides
iOS 26's automatic Liquid Glass chrome on LCENavigationView's
internal nav buttons - including the invisible backfilled mirror
button on whichever side has no real action - without affecting any
button that already sets its own explicit style closer to itself.

PediFoods/Views/Main/ReviewsView.swift

@@ -37,6 +37,7 @@ struct MyReviewsView: View {
         .setLeftButton(image: AnyView(AppBackButtonIcon())) { dismiss() }
         .setTitle(text: Text("Minhas Avaliações").font(AppTypography.heading2).foregroundStyle(AppColors.textPrimary))
         .setNavigationBarBackgroundColor(AppColors.backgroundLight)
+        .buttonStyle(.plain)
         .navigationDestination(item: $selectedDraft) { draft in
             OrderReviewView(draft: draft) {
                 Task { await loadReviewsFromBackend(forceRefresh: true) }
@@ -449,6 +450,7 @@ struct OrderReviewView: View {
         .setLeftButton(image: AnyView(AppBackButtonIcon())) { dismiss() }
         .setTitle(text: Text("Avaliar Pedido").font(AppTypography.heading2).foregroundStyle(AppColors.textPrimary))
         .setNavigationBarBackgroundColor(AppColors.backgroundLight)
+        .buttonStyle(.plain)
     }
 
     private var content: some View {