feat: Liquid Glass navigation bar for Reader (iOS 26 standard APIs)

Removed .navigationBarHidden(true) and all custom header layout.
Now uses standard iOS 26 navigation APIs that get Liquid Glass free:

- .navigationTitle("Reader") + .navigationSubtitle("74 unread")
- ToolbarItemGroup for sub-tabs (Unread/Starred/All) on leading
- ToolbarSpacer between groups
- ToolbarItemGroup for grid/list + menu on trailing
- Feed filter chips in .bottomBar toolbar
- When auto-scrolling: toolbar swaps to speed controls

The glass nav bar is translucent — content scrolls underneath.
Collapses to inline glass pill on scroll (system behavior).
No custom backgrounds, no custom layout — all system-managed.

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

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

@@ -9,11 +9,42 @@ struct ReaderTabView: View {
     @State private var showFeedManagement = false
     @State private var isCardView = true
 
+    private var subtitleText: String {
+        if let counters = vm.counters, counters.totalUnread > 0 {
+            return "\(counters.totalUnread) unread"
+        }
+        return "All caught up"
+    }
+
     var body: some View {
         NavigationStack {
-            VStack(spacing: 0) {
+            // Entry list as the main content — scrolls under the glass nav bar
-                // Sub-tab selector
+            EntryListView(vm: vm, isCardView: isCardView, isAutoScrolling: $isAutoScrolling, scrollSpeed: scrollSpeed)
-                HStack(spacing: 0) {
+                .navigationTitle("Reader")
+                .navigationSubtitle(subtitleText)
+                .toolbar {
+                    if isAutoScrolling {
+                        // Auto-scroll mode: speed controls in toolbar
+                        ToolbarItemGroup(placement: .topBarLeading) {
+                            Button {
+                                scrollSpeed = max(0.25, scrollSpeed - 0.25)
+                            } label: {
+                                Image(systemName: "minus")
+                            }
+
+                            Text(String(format: "%.2fx", scrollSpeed))
+                                .font(.body.weight(.bold).monospacedDigit())
+                                .foregroundStyle(Color.textPrimary)
+
+                            Button {
+                                scrollSpeed = min(3.0, scrollSpeed + 0.25)
+                            } label: {
+                                Image(systemName: "plus")
+                            }
+                        }
+                    } else {
+                        // Normal mode: sub-tabs + controls
+                        ToolbarItemGroup(placement: .topBarLeading) {
                             ForEach(Array(subTabs.enumerated()), id: \.offset) { index, tab in
                                 Button {
                                     withAnimation(.easeInOut(duration: 0.2)) {
@@ -26,45 +57,22 @@ struct ReaderTabView: View {
                                         }
                                     }
                                 } label: {
-                            HStack(spacing: 4) {
                                     Text(tab)
-                                    .font(.subheadline.weight(selectedSubTab == index ? .semibold : .regular))
+                                        .fontWeight(selectedSubTab == index ? .semibold : .regular)
-
-                                if index == 0, let counters = vm.counters, counters.totalUnread > 0 {
-                                    Text("\(counters.totalUnread)")
-                                        .font(.caption2.weight(.bold))
-                                        .foregroundStyle(.white)
-                                        .padding(.horizontal, 6)
-                                        .padding(.vertical, 2)
-                                        .background(Color.accentWarm)
-                                        .clipShape(Capsule())
-                                }
-                            }
-                            .foregroundStyle(selectedSubTab == index ? Color.accentWarm : Color.textSecondary)
-                            .padding(.vertical, 10)
-                            .padding(.horizontal, 16)
-                            .background {
-                                if selectedSubTab == index {
-                                    Capsule()
-                                        .fill(Color.accentWarm.opacity(0.12))
-                                }
                                 }
+                                .tint(selectedSubTab == index ? Color.accentWarm : Color.textSecondary)
                             }
                         }
 
-                    Spacer()
+                        ToolbarSpacer(.fixed, placement: .topBarTrailing)
 
-                    // Inline controls: grid/list + more menu
+                        ToolbarItemGroup(placement: .topBarTrailing) {
-                    HStack(spacing: 4) {
                             Button {
                                 withAnimation(.easeInOut(duration: 0.2)) {
                                     isCardView.toggle()
                                 }
                             } label: {
                                 Image(systemName: isCardView ? "list.bullet" : "square.grid.2x2")
-                                .font(.subheadline)
-                                .foregroundStyle(Color.accentWarm)
-                                .frame(width: 32, height: 32)
                             }
 
                             Menu {
@@ -95,17 +103,12 @@ struct ReaderTabView: View {
                                 }
                             } label: {
                                 Image(systemName: "ellipsis")
-                                .font(.subheadline)
-                                .foregroundStyle(Color.accentWarm)
-                                .frame(width: 32, height: 32)
                             }
                         }
-                    .padding(.trailing, 8)
                     }
-                .padding(.leading)
-                .padding(.top, 8)
 
-                // Feed filter bar
+                    // Feed filter chips — bottom toolbar (scrolls with content)
+                    ToolbarItem(placement: .bottomBar) {
                         ScrollView(.horizontal, showsIndicators: false) {
                             HStack(spacing: 8) {
                                 feedFilterChip("All", isSelected: isAllSelected) {
@@ -129,41 +132,7 @@ struct ReaderTabView: View {
                                     }
                                 }
                             }
-                    .padding(.horizontal)
-                    .padding(.vertical, 8)
                         }
-                .frame(height: 44)
-
-                // Entry list
-                EntryListView(vm: vm, isCardView: isCardView, isAutoScrolling: $isAutoScrolling, scrollSpeed: scrollSpeed)
-            }
-            .frame(maxWidth: .infinity, maxHeight: .infinity)
-            .background(Color.canvas)
-            .navigationBarHidden(true)
-            .safeAreaBar(edge: .bottom) {
-                if isAutoScrolling {
-                    HStack(spacing: 16) {
-                        Button {
-                            scrollSpeed = max(0.25, scrollSpeed - 0.25)
-                        } label: {
-                            Image(systemName: "minus")
-                                .font(.caption.weight(.bold))
-                                .foregroundStyle(Color.accentWarm)
-                        }
-
-                        Text(String(format: "%.2fx", scrollSpeed))
-                            .font(.system(size: 13, weight: .bold, design: .monospaced))
-                            .foregroundStyle(Color.textPrimary)
-
-                        Button {
-                            scrollSpeed = min(3.0, scrollSpeed + 0.25)
-                        } label: {
-                            Image(systemName: "plus")
-                                .font(.caption.weight(.bold))
-                                .foregroundStyle(Color.accentWarm)
-                        }
-                    }
-                    .padding(.horizontal, 20)
                     }
                 }
                 .sheet(isPresented: $showFeedSheet) {