fix: hide FAB on Reader tab, fix tab bar collapse during auto-scroll, position glass bar bottom-right

1. FAB hidden when selectedTab == 2 (Reader) — no plus button
   on Reader since it's for food logging

2. Auto-scroll now notifies original UIScrollViewDelegate via
   scrollViewDidScroll after each contentOffset change — this
   triggers tabBarMinimizeBehavior so the tab bar collapses
   during auto-scroll just like manual scrolling

3. Glass control bar positioned bottom-right (like Photos search
   icon) instead of bottom-center

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

ios/Platform/Platform/ContentView.swift

@@ -53,29 +53,29 @@ struct MainTabView: View {
             .tint(Color.accentWarm)
             .modifier(TabBarMinimizeModifier())
 
-            // Floating buttons
-            VStack {
-                Spacer()
-                HStack(alignment: .bottom) {
-                    // Feedback button (subtle, bottom-left)
-                    FeedbackButton()
-                        .padding(.leading, 20)
-
+            // Floating buttons (hidden on Reader tab)
+            if selectedTab != 2 {
+                VStack {
                     Spacer()
+                    HStack(alignment: .bottom) {
+                        FeedbackButton()
+                            .padding(.leading, 20)
 
-                    // Add food button (prominent, bottom-right)
-                    Button { showAssistant = true } label: {
-                        Image(systemName: "plus")
-                            .font(.title2.weight(.semibold))
-                            .foregroundStyle(.white)
-                            .frame(width: 56, height: 56)
-                            .background(Color.accentWarm)
-                            .clipShape(Circle())
-                            .shadow(color: .black.opacity(0.2), radius: 8, y: 4)
+                        Spacer()
+
+                        Button { showAssistant = true } label: {
+                            Image(systemName: "plus")
+                                .font(.title2.weight(.semibold))
+                                .foregroundStyle(.white)
+                                .frame(width: 56, height: 56)
+                                .background(Color.accentWarm)
+                                .clipShape(Circle())
+                                .shadow(color: .black.opacity(0.2), radius: 8, y: 4)
+                        }
+                        .padding(.trailing, 20)
                     }
-                    .padding(.trailing, 20)
+                    .padding(.bottom, 70)
                 }
-                .padding(.bottom, 70)
             }
         }
         .confettiCannon(

ios/Platform/Platform/Features/Reader/Views/ReaderTabView.swift

@@ -11,7 +11,7 @@ struct ReaderTabView: View {
 
     var body: some View {
         NavigationStack {
-            ZStack(alignment: .bottom) {
+            ZStack(alignment: .bottomTrailing) {
                 VStack(spacing: 0) {
                     // Sub-tab selector
                     HStack(spacing: 0) {
@@ -93,7 +93,8 @@ struct ReaderTabView: View {
 
                 // MARK: - Liquid Glass Control Bar
                 glassControlBar
-                    .padding(.bottom, 2)
+                    .padding(.trailing, 16)
+                    .padding(.bottom, 4)
             }
             .navigationBarHidden(true)
             .sheet(isPresented: $showFeedSheet) {

ios/Platform/Platform/Features/Reader/Views/ScrollViewDriver.swift

@@ -110,6 +110,9 @@ struct ScrollViewDriver: UIViewRepresentable {
 
             sv.contentOffset.y = newY
 
+            // Notify delegate so tab bar minimize behavior triggers
+            originalDelegate?.scrollViewDidScroll?(sv)
+
             // Stop at bottom
             if newY >= maxOffset - 1 {
                 stopAndNotify()