Session Chat Auto-Scroll Adjustment

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

NucleicRemote/NucleicRemote/Views/SessionDetailView.swift

@@ -442,10 +442,22 @@ struct TranscriptList: View {
     var body: some View {
         ScrollViewReader { proxy in
             ScrollView {
-                LazyVStack(alignment: .leading, spacing: 14) {
+                // Eager VStack (not Lazy): the whole transcript is in memory, and eager layout
+                // hands the ScrollView its true, *fixed* total content height up front. A
+                // LazyVStack instead realizes rows as they scroll into view, so its reported
+                // content height shifts mid-scroll as rows resolve — and that shifting height fed
+                // straight back through the geometry reader below (flip at-bottom → toggle the
+                // `.defaultScrollAnchor` → re-pin → new height → …), which is what made the whole
+                // transcript jitter up and down under a drag. A stable height breaks the loop.
+                // Matches the Mac transcript, for the same reason.
+                VStack(alignment: .leading, spacing: 14) {
                     ForEach(items) { item in
                         TranscriptRow(item: item).id(item.id)
                     }
+                    // Fixed, zero-content scroll target for "jump to bottom". Scrolling to the last
+                    // row's id instead would chase a moving target — the final row's identity
+                    // changes as its streaming deltas coalesce — nudging the viewport mid-stream.
+                    Color.clear.frame(height: 1).id(Self.bottomAnchorID)
                 }
                 .padding()
                 // Cap the transcript to a readable measure on a wide iPad so lines don't run