nvrsion: Add: Move the chevron circle vertically above the composer bar and fix the jump distance so the chevron button is hidden when tapped.

Nucleic-Promote: 1
Co-authored-by: Nucleic <[email protected]>

NucleicRemote/NucleicRemote/Views/SessionDetailView.swift

@@ -306,9 +306,11 @@ struct SessionDetailView: View {
         .overlay(alignment: .top) {
             if !isScrolledToBottom {
                 JumpToBottomButton { scrollToBottomRequest += 1 }
-                    // Hang the button *above* the bar: report its bottom edge (plus a gap) as its
-                    // top guide, so the overlay's top alignment places it outside the bar's bounds.
-                    .alignmentGuide(.top) { $0[.bottom] + 8 }
+                    // Hang the button fully *above* the bar: top-aligned, then shifted up by its
+                    // own 30pt height plus an 8pt gap. A render-time offset (not an alignment
+                    // guide, which misplaced it half-overlapping the bar's top edge) so the
+                    // placement is exact and — critically — contributes nothing to the inset.
+                    .offset(y: -38)
                     .transition(.move(edge: .bottom).combined(with: .opacity))
             }
         }
@@ -705,11 +707,18 @@ struct TranscriptList: View {
                     scrollToEnd(proxy, animated: !transcriptSettling)
                 }
             }
-            // An explicit jump — the chevron or sending a message — always wins. The chevron
-            // itself lives in the parent's chat bar (above the composer), not as an overlay here,
-            // so it sits over the composer instead of behind the floating bar; a tap bumps this
-            // same request, and following resumes once the geometry reader sees the bottom.
-            .onChange(of: scrollToBottomRequest) { scrollToEnd(proxy) }
+            // An explicit jump — the chevron or sending a message — always wins, and it *is* the
+            // user saying "follow again": re-engage the gate directly rather than waiting for the
+            // geometry to confirm. The animated scroll can come to rest a few points short of the
+            // follow threshold (content padding, inset rounding), which sat inside the hysteresis
+            // band — following never re-engaged and the chevron lingered until the user manually
+            // scrolled the last few points. Setting the gate here hides the chevron immediately
+            // and hands pinning back to the bottom anchor; a later real scroll-up still
+            // disengages it as usual.
+            .onChange(of: scrollToBottomRequest) {
+                isScrolledToBottom = true
+                scrollToEnd(proxy)
+            }
             // Warm the Markdown parse caches off the main thread whenever the row set grows —
             // `initial: true` fires it for the batch that lands on open (the expensive case), and
             // each later new row tops it up. Keyed on the row *count*, so streaming deltas into an