fix(store): replace ZStack overlay sticky approach with native pinnedViews + reliable scroll tracking

- Use LazyVStack(pinnedViews: [.sectionHeaders]) for native section header stickiness
- Move ScrollOffsetReader outside LazyVStack (sibling) to prevent lazy-unload breaking scroll tracking
- Add baseline capture to ScrollOffsetReader to correctly normalize offset regardless of ScrollView content insets
- Apply safeAreaTop padding to categoryTabs only when pinned (isCategoryTabsPinned), preventing oversized header before scroll
- Remove complex ZStack dual-tabs overlay, stickyProgress logic, and categoryTabsStickyProgress
- categoryTabs now accepts isPinned flag with easeInOut(0.15s) animation on pin transition

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

pedi-foods/Sources/PediFoods/Views/Main/StoreDetailView+Logic.swift

@@ -51,8 +51,8 @@ extension StoreDetailView {
     }
 
     var deliveryValueLabel: String {
-        if let minOrder = info?.minOrder {
-            return formatCurrency(minOrder)
+        if let fee = storeDeliveryFee {
+            return formatCurrency(fee)
         }
         return "R$ --"
     }