Restore vertical scroll + line-based markdown; swipe on bottom bar; bump to 3.3

The horizontal paging ScrollView squished the markdown text and the TabView
broke navigation. Revert to the plain vertical ScrollView + switch (always
rendered correctly). Swipe-to-change now lives on the bottom tab bar itself
(simultaneous DragGesture), so tapping tabs still works. Rewrite MarkdownText
line-based: each source line renders on its own line (AttributedString
collapses single newlines into spaces), with heading/bullet/code handling.
Bump to 3.3.

GiteaPR/Detail/PRDetailView.swift

@@ -103,32 +103,17 @@ struct PRDetailView: View {
         VStack(spacing: 0) {
             header(pr)
 
-            // Horizontal paging ScrollView — swipeable like a TabView, but
-            // without breaking NavigationLink inside the tabs (TabView's .page
-            // style swallows taps and interferes with nested navigation).
-            ScrollView(.horizontal, showsIndicators: false) {
-                HStack(spacing: 0) {
-                    OverviewTab(pr: pr)
-                        .id(DetailTab.overview)
-                        .containerRelativeFrame(.horizontal)
-
-                    ConversationTab(vm: vm)
-                        .id(DetailTab.conversation)
-                        .containerRelativeFrame(.horizontal)
-
-                    FilesTab(vm: vm)
-                        .id(DetailTab.files)
-                        .containerRelativeFrame(.horizontal)
-
-                    ChecksTab(vm: vm, onRerun: { showRerunConfirm = $0 })
-                        .id(DetailTab.checks)
-                        .containerRelativeFrame(.horizontal)
+            // Vertical scroll — has always rendered correctly (a horizontal
+            // ScrollView/TabView broke NavigationLink and mangled markdown).
+            ScrollView {
+                switch selectedTab {
+                case .overview: OverviewTab(pr: pr)
+                case .conversation: ConversationTab(vm: vm)
+                case .files: FilesTab(vm: vm)
+                case .checks: ChecksTab(vm: vm, onRerun: { showRerunConfirm = $0 })
+                case .none: OverviewTab(pr: pr)
                 }
-                .scrollTargetLayout()
             }
-            .scrollTargetBehavior(.paging)
-            .scrollPosition(id: $selectedTab)
-            .ignoresSafeArea(edges: .bottom)
 
             bottomTabBar
         }
@@ -204,6 +189,21 @@ struct PRDetailView: View {
         )
         .padding(.horizontal, 20)
         .padding(.bottom, 8)
+        // Swipe across the bar to change sections (iOS 26 feel). Taps on the
+        // individual tab buttons still work — simultaneous gesture.
+        .simultaneousGesture(
+            DragGesture(minimumDistance: 20)
+                .onEnded { value in
+                    let tabs = DetailTab.allCases
+                    guard let current = selectedTab ?? .overview,
+                          let idx = tabs.firstIndex(of: current) else { return }
+                    if value.translation.width < -40, idx < tabs.count - 1 {
+                        withAnimation { selectedTab = tabs[idx + 1] }
+                    } else if value.translation.width > 40, idx > 0 {
+                        withAnimation { selectedTab = tabs[idx - 1] }
+                    }
+                }
+        )
     }
 
     private var reviewMenu: some View {