Session Chat Auto-Scroll Adjustment

Nucleic-Session: 8FCEB1B7-A6C0-44E2-B00A-E4786F41A1FA
Co-authored-by: Nucleic <[email protected]>

NucleicRemote/NucleicRemote/Views/SessionDetailView.swift

@@ -241,6 +241,15 @@ struct SessionDetailView: View {
     /// pending. Content scrolls beneath it; nothing renders when there's nothing to act on.
     private var actionArea: some View {
         VStack(spacing: 8) {
+            // The jump-to-bottom chevron rides here, immediately above the chat bar — not as a
+            // transcript overlay, which aligned to the scroll view's full-height bounds and so sat
+            // behind this floating bar at the screen's bottom edge. Shown only while scrolled up; a
+            // tap bumps the same scroll request the send button uses, so following resumes once the
+            // transcript reaches the bottom. Mirrors the Mac's `JumpToBottomButton`.
+            if !isScrolledToBottom {
+                JumpToBottomButton { scrollToBottomRequest += 1 }
+                    .transition(.move(edge: .bottom).combined(with: .opacity))
+            }
             // Interacting with a chat while the owning Mac is unreachable surfaces this first, so a
             // disabled composer reads as "offline / read-only history" rather than broken.
             if !store.connectivity.isLive { disconnectedBanner }
@@ -248,6 +257,7 @@ struct SessionDetailView: View {
         }
         .padding(.horizontal, 12)
         .padding(.bottom, 8)
+        .animation(.easeInOut(duration: 0.15), value: isScrolledToBottom)
     }
 
     /// The offline notice over the transcript: the chat's history is cached and readable, but the