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/ConversationView.swift

@@ -144,6 +144,7 @@ private struct ConversationContent: View {
     @FocusState private var composerFocused: Bool
     @Environment(\.dynamicTypeSize) private var typeSize
     @Environment(\.accessibilityReduceMotion) private var reduceMotion
+    @Environment(\.colorSchemeContrast) private var contrast
 
     init(settings: SettingsStore, session: VoiceSession) {
         self.settings = settings
@@ -171,8 +172,14 @@ private struct ConversationContent: View {
         .onChange(of: session.state) { _, state in
             if state == .ready && settings.textMode { composerFocused = true }
         }
-        .sensoryFeedback(.success, trigger: session.state == .ready ? true : false) { _, _ in true }
-        .sensoryFeedback(.error, trigger: session.state.isFailed) { _, _ in true }
+        .sensoryFeedback(.success, trigger: session.state == .ready) { old, new in
+            // Success only on the transition INTO readiness, not out.
+            !old && new
+        }
+        .sensoryFeedback(.error, trigger: session.state.isFailed) { old, new in
+            // Error only on entering failure, not leaving it.
+            !old && new
+        }
     }
 
     // MARK: Welcome (pre-connection, no history)
@@ -378,11 +385,12 @@ private struct ConversationContent: View {
             .font(NearlightFont.control(typeSize))
             .foregroundStyle(selected ? Nearlight.rosewood : Nearlight.ink)
             .frame(maxWidth: .infinity, minHeight: 52)
-            .background(selected ? Nearlight.selectedWash : Nearlight.surface,
+            .background(selected && contrast == .increased ? Nearlight.surface : selected ? Nearlight.selectedWash : Nearlight.surface,
                         in: RoundedRectangle(cornerRadius: Nearlight.radiusControl))
             .overlay(
                 RoundedRectangle(cornerRadius: Nearlight.radiusControl)
-                    .strokeBorder(selected ? Nearlight.rosewood.opacity(0.4) : Nearlight.quiet, lineWidth: 1)
+                    .strokeBorder(selected && contrast == .increased ? Nearlight.rosewood : selected ? Nearlight.rosewood.opacity(0.4) : Nearlight.quiet,
+                                  lineWidth: selected && contrast == .increased ? 2 : 1)
             )
         }
         .accessibilityIdentifier(id)