fix(views): sort timeline entries after WebSocket append

WebSocket event handlers for comment:created and activity:created
appended new entries to the end of the timeline array without sorting.
When events arrived out of order (e.g. agent replying rapidly), comments
displayed out of chronological order.

Sort the timeline by created_at after each append to maintain correct
chronological ordering.

Closes #1032

packages/views/issues/hooks/use-issue-timeline.ts

@@ -70,7 +70,9 @@ export function useIssueTimeline(issueId: string, userId?: string) {
           (old) => {
             if (!old) return old;
             if (old.some((e) => e.id === comment.id)) return old;
-            return [...old, commentToTimelineEntry(comment)];
+            return [...old, commentToTimelineEntry(comment)].sort(
+              (a, b) => a.created_at.localeCompare(b.created_at),
+            );
           },
         );
       },
@@ -144,7 +146,9 @@ export function useIssueTimeline(issueId: string, userId?: string) {
           (old) => {
             if (!old) return old;
             if (old.some((e) => e.id === entry.id)) return old;
-            return [...old, entry];
+            return [...old, entry].sort(
+              (a, b) => a.created_at.localeCompare(b.created_at),
+            );
           },
         );
       },