Fix reading-safety and accessibility majors from review

- Transcript: drag suspends auto-follow; long-press selection suspends
  following; Latest is a trailing outlined capsule that re-enables follow
- Lightwell: pulse via isolated TimelineView (2.4s triangle wave), pauses
  when offscreen; Reduce Motion uses static geometry (no level resizing)
- Increase Contrast: solid Rosewood lightwell fill, 2pt Rosewood selected
  outlines on mode buttons
- Haptics: success only on entering ready, error only on entering failure

Sources/Features/Conversation/TranscriptListView.swift

@@ -7,9 +7,15 @@ struct TranscriptListView: View {
     var onClear: () -> Void
     @State private var confirmClear = false
     @State private var followingLatest = true
+    @State private var selectionActive = false
     @Environment(\.accessibilityReduceMotion) private var reduceMotion
     @Environment(\.dynamicTypeSize) private var typeSize
 
+    /// Auto-follow eligibility: never scroll while the user is selecting
+    /// text or reading history.
+    private var isFollowingEligible: Bool {
+        followingLatest && !selectionActive
+    }
     private static let deliveryMarkers = #"\[(?:appreciative|calm|concerned|curious|encouraging|excited|happy|joking|quiet|reassuring|reflective|sad|serious|surprised|sympathetic|urgent|whispering|laughter|sighing|breathing|neutral)\]\s*"#
 
     var body: some View {
@@ -39,8 +45,6 @@ struct TranscriptListView: View {
                         }
                         ForEach(events) { event in transcriptRow(event) }
                         Color.clear.frame(height: 1).id("latest")
-                            .onAppear { followingLatest = true }
-                            .onDisappear { followingLatest = false }
                     }
                     .padding(.horizontal, Nearlight.s20)
                     .padding(.top, Nearlight.s16)
@@ -49,23 +53,43 @@ struct TranscriptListView: View {
                 }
                 .scrollDismissesKeyboard(.interactively)
                 .defaultScrollAnchor(.top)
+                .simultaneousGesture(DragGesture().onChanged { _ in
+                    // Any manual drag suspends automatic following.
+                    followingLatest = false
+                })
                 .onChange(of: events.last?.text) { _, _ in
-                    if followingLatest { proxy.scrollTo("latest", anchor: .bottom) }
+                    guard isFollowingEligible else { return }
+                    proxy.scrollTo("latest", anchor: .bottom)
                 }
                 .onChange(of: events.count) { _, _ in
-                    if followingLatest { proxy.scrollTo("latest", anchor: .bottom) }
+                    guard isFollowingEligible else { return }
+                    proxy.scrollTo("latest", anchor: .bottom)
+                }
+                .onChange(of: selectionActive) { _, active in
+                    // Beginning text selection suspends auto-follow so the
+                    // user's reading position is never disturbed.
+                    if active { followingLatest = false }
                 }
                 if !followingLatest && !events.isEmpty {
-                    Button {
-                        withAnimation(reduceMotion ? nil : Nearlight.standard) {
-                            proxy.scrollTo("latest", anchor: .bottom)
+                    HStack {
+                        Spacer()
+                        Button {
+                            followingLatest = true
+                            withAnimation(reduceMotion ? nil : Nearlight.standard) {
+                                proxy.scrollTo("latest", anchor: .bottom)
+                            }
+                        } label: {
+                            Label("Latest", systemImage: "arrow.down")
+                                .font(NearlightFont.support(typeSize))
+                                .padding(.horizontal, Nearlight.s12)
+                                .frame(minHeight: 44)
+                                .background(Nearlight.surface, in: Capsule())
+                                .overlay(Capsule().strokeBorder(Nearlight.quiet, lineWidth: 1))
                         }
-                    } label: {
-                        Label("Latest messages", systemImage: "arrow.down")
-                            .font(NearlightFont.support(typeSize))
-                            .frame(minHeight: 44)
+                        .accessibilityIdentifier("talk.latest")
                     }
-                    .accessibilityIdentifier("talk.latest")
+                    .padding(.horizontal, Nearlight.s12)
+                    .padding(.bottom, Nearlight.s12)
                 }
             }
         }
@@ -104,6 +128,11 @@ struct TranscriptListView: View {
                 .fixedSize(horizontal: false, vertical: true)
         }
         .frame(maxWidth: .infinity, alignment: .leading)
+        .onLongPressGesture(minimumDuration: 0.05, pressing: { pressing in
+            // Text-selection interaction begins with long-press on the row;
+            // suspend auto-follow while pressing/held.
+            if pressing { selectionActive = true }
+        }, perform: {})
         .contextMenu {
             Button("Copy message", systemImage: "doc.on.doc") { UIPasteboard.general.string = text }
         }