diff --git a/crates/op-editor-ui/src/widgets/ai_chat_transcript.rs b/crates/op-editor-ui/src/widgets/ai_chat_transcript.rs
index dc826771f..0a9880c90 100644
--- a/crates/op-editor-ui/src/widgets/ai_chat_transcript.rs
+++ b/crates/op-editor-ui/src/widgets/ai_chat_transcript.rs
@@ -272,8 +272,8 @@ pub(crate) fn build_transcript(
     // Pass 2 — place the visible tail from the body top.
     let mut items = Vec::new();
     let mut top = body_rect.origin.y;
-    for i in start..messages.len() {
-        let (item, bottom) = build_item(&messages[i], i, top, body_rect, locale);
+    for (i, msg) in messages.iter().enumerate().skip(start) {
+        let (item, bottom) = build_item(msg, i, top, body_rect, locale);
         items.push(item);
         top = bottom + MSG_GAP;
     }
diff --git a/vendor/casement b/vendor/casement
index 5877fa83e..da0bf09e2 160000
--- a/vendor/casement
+++ b/vendor/casement
@@ -1 +1 @@
-Subproject commit 5877fa83e8f7c5ce81afec234c1cd5146262a92e
+Subproject commit da0bf09e2fa5412f8ddf0cbc115355116b59ce0a