simplify: remove sub-tabs, starred, feed filter chips from Reader

Reader now shows only unread entries. Removed:
- Unread/Starred/All sub-tab selector
- Feed filter chip bar (categories)
- All related state (selectedSubTab) and helpers

Glass nav bar shows: "Reader" title + "74 unread" subtitle
Trailing toolbar: grid/list toggle + ellipsis menu
Auto-scroll: speed controls in leading toolbar

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

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

@@ -4,7 +4,6 @@ struct ReaderTabView: View {
     @Bindable var vm: ReaderViewModel
     @Binding var isAutoScrolling: Bool
     @Binding var scrollSpeed: Double
-    @State private var selectedSubTab = 0
     @State private var showFeedSheet = false
     @State private var showFeedManagement = false
     @State private var isCardView = true
@@ -43,29 +42,7 @@ struct ReaderTabView: View {
                             }
                         }
                     } else {
-                        // Normal mode: sub-tabs + controls
-                        ToolbarItemGroup(placement: .topBarLeading) {
-                            ForEach(Array(subTabs.enumerated()), id: \.offset) { index, tab in
-                                Button {
-                                    withAnimation(.easeInOut(duration: 0.2)) {
-                                        selectedSubTab = index
-                                        switch index {
-                                        case 0: vm.applyFilter(.unread)
-                                        case 1: vm.applyFilter(.starred)
-                                        case 2: vm.applyFilter(.all)
-                                        default: break
-                                        }
-                                    }
-                                } label: {
-                                    Text(tab)
-                                        .fontWeight(selectedSubTab == index ? .semibold : .regular)
-                                }
-                                .tint(selectedSubTab == index ? Color.accentWarm : Color.textSecondary)
-                            }
-                        }
-
-                        ToolbarSpacer(.fixed, placement: .topBarTrailing)
-
+                        // Normal mode: controls
                         ToolbarItemGroup(placement: .topBarTrailing) {
                             Button {
                                 withAnimation(.easeInOut(duration: 0.2)) {
@@ -107,33 +84,6 @@ struct ReaderTabView: View {
                         }
                     }
 
-                    // Feed filter chips — bottom toolbar (scrolls with content)
-                    ToolbarItem(placement: .bottomBar) {
-                        ScrollView(.horizontal, showsIndicators: false) {
-                            HStack(spacing: 8) {
-                                feedFilterChip("All", isSelected: isAllSelected) {
-                                    let tab = selectedSubTab
-                                    switch tab {
-                                    case 0: vm.applyFilter(.unread)
-                                    case 1: vm.applyFilter(.starred)
-                                    case 2: vm.applyFilter(.all)
-                                    default: vm.applyFilter(.unread)
-                                    }
-                                }
-
-                                ForEach(vm.feeds) { feed in
-                                    let count = vm.counters?.count(forFeed: feed.id) ?? 0
-                                    feedFilterChip(
-                                        feed.title,
-                                        count: selectedSubTab == 0 ? count : nil,
-                                        isSelected: vm.currentFilter == .feed(feed.id)
-                                    ) {
-                                        vm.applyFilter(.feed(feed.id))
-                                    }
-                                }
-                            }
-                        }
-                    }
                 }
                 .sheet(isPresented: $showFeedSheet) {
                     AddFeedSheet(vm: vm)
@@ -145,46 +95,8 @@ struct ReaderTabView: View {
         .onAppear {
             ArticleRenderer.shared.reWarmIfNeeded()
         }
-        .onChange(of: selectedSubTab) { _, _ in
-            isAutoScrolling = false
-        }
         .onChange(of: vm.currentFilter) { _, _ in
             isAutoScrolling = false
         }
     }
-
-    // MARK: - Helpers
-
-    private var subTabs: [String] { ["Unread", "Starred", "All"] }
-
-    private var isAllSelected: Bool {
-        switch vm.currentFilter {
-        case .unread, .starred, .all: return true
-        default: return false
-        }
-    }
-
-    private func feedFilterChip(
-        _ title: String,
-        count: Int? = nil,
-        isSelected: Bool,
-        action: @escaping () -> Void
-    ) -> some View {
-        Button(action: action) {
-            HStack(spacing: 4) {
-                Text(title)
-                    .font(.caption.weight(isSelected ? .semibold : .regular))
-                    .lineLimit(1)
-                if let count, count > 0 {
-                    Text("\(count)")
-                        .font(.system(size: 10).weight(.bold))
-                }
-            }
-            .foregroundStyle(isSelected ? Color.accentWarm : Color.textSecondary)
-            .padding(.horizontal, 12)
-            .padding(.vertical, 6)
-            .background(isSelected ? Color.accentWarm.opacity(0.12) : Color.surfaceCard)
-            .clipShape(Capsule())
-        }
-    }
 }