fix(webui): tighten turn completion handling

Keep the new turn-end signal scoped to WebSocket clients, preserve pending tool-call state across trailing tool result rows, and drop the accidental npm lockfile from the Bun-based WebUI.

Co-authored-by: Cursor <cursoragent@cursor.com>

webui/src/hooks/useSessions.ts

@@ -84,7 +84,7 @@ export function useSessionHistory(key: string | null): {
   messages: UIMessage[];
   loading: boolean;
   error: string | null;
-  /** ``true`` when the last persisted message has ``tool_calls`` but no
+  /** ``true`` when the last persisted assistant turn has ``tool_calls`` but no
    *  final text yet — the model was still processing when the page loaded. */
   hasPendingToolCalls: boolean;
 } {
@@ -153,9 +153,11 @@ export function useSessionHistory(key: string | null): {
             },
           ];
         });
-        // Check if the last persisted message has tool_calls but no final
-        // text yet — the model was still processing when the page loaded.
-        const lastRaw = body.messages[body.messages.length - 1];
+        // Tool result rows can trail the assistant tool-call row while the turn
+        // is still running, so check the last conversational row.
+        const lastRaw = [...body.messages]
+          .reverse()
+          .find((m) => m.role === "user" || m.role === "assistant");
         const hasPending =
           lastRaw?.role === "assistant" &&
           Array.isArray(lastRaw.tool_calls) &&

webui/src/tests/useSessions.test.tsx

@@ -194,6 +194,36 @@ describe("useSessions", () => {
     expect(result.current.hasPendingToolCalls).toBe(true);
   });
 
+  it("keeps pending when tool result rows trail assistant tool calls", async () => {
+    vi.mocked(api.fetchSessionMessages).mockResolvedValue({
+      key: "websocket:chat-pending-tool-result",
+      created_at: "2026-04-20T10:00:00Z",
+      updated_at: "2026-04-20T10:05:00Z",
+      messages: [
+        {
+          role: "assistant",
+          content: "Using 1 tool",
+          timestamp: "2026-04-20T10:00:01Z",
+          tool_calls: [{ id: "call-1" }],
+        },
+        {
+          role: "tool",
+          content: "tool output",
+          timestamp: "2026-04-20T10:00:02Z",
+          tool_call_id: "call-1",
+        },
+      ],
+    });
+
+    const { result } = renderHook(() => useSessionHistory("websocket:chat-pending-tool-result"), {
+      wrapper: wrap(fakeClient()),
+    });
+
+    await waitFor(() => expect(result.current.loading).toBe(false));
+
+    expect(result.current.hasPendingToolCalls).toBe(true);
+  });
+
   it("does not flag history as pending once the assistant turn has no tool calls", async () => {
     vi.mocked(api.fetchSessionMessages).mockResolvedValue({
       key: "websocket:chat-done",