fix(web): follow composer and rail layout

web/src/structured.ts

@@ -389,8 +389,10 @@ export function createStructuredConnection(
 
   // ---- composer ----
   function autoResize(): void {
-    input.style.height = "auto";
-    input.style.height = `${Math.min(input.scrollHeight, 160)}px`;
+    updateTranscriptLayout(() => {
+      input.style.height = "auto";
+      input.style.height = `${Math.min(input.scrollHeight, 160)}px`;
+    });
   }
   input.addEventListener("input", autoResize);
   input.addEventListener("keydown", (e) => {
@@ -446,8 +448,11 @@ export function createStructuredConnection(
   // ---- narrow-pane rail collapse (a split pane, not just the viewport) ----
   const NARROW_BREAKPOINT = 560;
   const resizeObserver = new ResizeObserver((entries) => {
+    if (disposed) return;
     const width = entries[0]?.contentRect.width ?? bodyEl.clientWidth;
-    bodyEl.classList.toggle("st-narrow", width < NARROW_BREAKPOINT);
+    const narrow = width < NARROW_BREAKPOINT;
+    if (bodyEl.classList.contains("st-narrow") === narrow) return;
+    updateTranscriptLayout(() => bodyEl.classList.toggle("st-narrow", narrow));
   });
   resizeObserver.observe(bodyEl);