feat: hide Reader tab for Madiha (user ID 4)

Madiha sees only Home + Fitness tabs (same as web dashboard).
Reader tab, pre-warm, and data pre-fetch all skipped for her login.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ios/Platform/Platform/ContentView.swift

@@ -23,11 +23,16 @@ struct ContentView: View {
 }
 
 struct MainTabView: View {
+    @Environment(AuthManager.self) private var auth
     @State private var selectedTab = 0
     @State private var showAssistant = false
     @State private var confettiTrigger = 0
     @State private var readerVM = ReaderViewModel()
 
+    private var showReader: Bool {
+        auth.currentUser?.id != 4 // Madiha doesn't see Reader
+    }
+
     var body: some View {
         ZStack {
             TabView(selection: $selectedTab) {
@@ -39,10 +44,12 @@ struct MainTabView: View {
                     .tabItem { Label("Fitness", systemImage: "flame.fill") }
                     .tag(1)
 
+                if showReader {
                     ReaderTabView(vm: readerVM)
                         .tabItem { Label("Reader", systemImage: "newspaper.fill") }
                         .tag(2)
                 }
+            }
             .tint(Color.accentWarm)
             .modifier(TabBarMinimizeModifier())
 
@@ -86,7 +93,7 @@ struct MainTabView: View {
             AssistantSheetView(onFoodAdded: foodAdded)
         }
         .task {
-            // Pre-warm WebKit process pool + pre-fetch reader data
+            guard showReader else { return }
             _ = ArticleRenderer.shared
             await readerVM.loadInitial()
         }