Truncation Logic Refinement

Nucleic-Session: FE1E2C94-7945-4827-AF56-74525A9BD434
Co-authored-by: Nucleic <[email protected]>

NucleicRemote/NucleicRemote/Views/SessionDetailView.swift

@@ -34,6 +34,15 @@ struct SessionDetailView: View {
         TranscriptList(events: store.openEvents,
                        scrollToBottomRequest: scrollToBottomRequest,
                        isScrolledToBottom: $isScrolledToBottom)
+            // Measure the transcript's full height (the floating bar overlays it via safeAreaInset,
+            // so this frame is the whole screen area the card has to live within) and hand it to the
+            // action card so it can bound itself.
+            .background {
+                GeometryReader { proxy in
+                    Color.clear.preference(key: AvailableHeightKey.self, value: proxy.size.height)
+                }
+            }
+            .onPreferenceChange(AvailableHeightKey.self) { availableHeight = $0 }
             // The chat bar floats over the scrolling content on Liquid Glass instead of sitting
             // in a boxed strip below it, so the transcript runs the full height of the screen.
             .safeAreaInset(edge: .bottom) { actionArea }