Merge explains why it did nothing

web/src/task.ts

@@ -1113,7 +1113,15 @@ function messageImages(ids: unknown): HTMLElement | null {
 export async function confirmMerge(taskId: string): Promise<void> {
   const task = findTask(taskId);
   const sessionState = currentSession(taskId)?.state;
-  if (!task || task.status !== "active" || task.merge_queued_at !== undefined || sessionState === "running") {
+  if (!task || task.status !== "active") {
+    return;
+  }
+  if (sessionState === "running") {
+    void showAlert("Agent is mid-turn; merge when it's idle");
+    return;
+  }
+  if (task.merge_queued_at !== undefined) {
+    void showAlert("Merge already held behind another merge in this project");
     return;
   }
   const target = state.projects.find((p) => p.id === task.project_id)?.default_branch ?? "the default branch";
@@ -1124,6 +1132,7 @@ export async function confirmMerge(taskId: string): Promise<void> {
       get("/api/tasks/{taskId}/co-authors", { path: { taskId } }),
     ]);
     if (unmerged.commits === 0 && unmerged.files === 0) {
+      void showAlert(`Nothing to merge: no commits or uncommitted files differ from ${target}`);
       return;
     }
     coAuthors = people;