fix(webui): clear stale run status on reconnect

webui/src/lib/nanobot-client.ts

@@ -425,6 +425,13 @@ export class NanobotClient {
     for (const handler of this.statusHandlers) handler(status);
   }
 
+  private clearRunStatusesForReconnect(): void {
+    if (this.runStartedAtByChatId.size === 0) return;
+    const chatIds = [...this.runStartedAtByChatId.keys()];
+    this.runStartedAtByChatId.clear();
+    for (const chatId of chatIds) this.emitRunStatus(chatId, null);
+  }
+
   private handleOpen(): void {
     this.setStatus("open");
     this.reconnectAttempts = 0;
@@ -629,6 +636,7 @@ export class NanobotClient {
   }
 
   private scheduleReconnect(): void {
+    this.clearRunStatusesForReconnect();
     this.setStatus("reconnecting");
     const attempt = this.reconnectAttempts++;
     // Exponential backoff: 0.5s, 1s, 2s, 4s, capped.

webui/src/tests/nanobot-client.test.ts

@@ -188,6 +188,32 @@ describe("NanobotClient", () => {
     expect(client.getRunStartedAt("chat-strip")).toBeNull();
   });
 
+  it("clears stale run strip when reconnecting after a dropped socket", async () => {
+    const client = new NanobotClient({
+      url: "ws://test",
+      reconnect: true,
+      maxBackoffMs: 10,
+      socketFactory: (url) => new FakeSocket(url) as unknown as WebSocket,
+    });
+    const handler = vi.fn();
+    client.onRunStatus(handler);
+    client.connect();
+    lastSocket().fakeOpen();
+    lastSocket().fakeMessage({
+      event: "goal_status",
+      chat_id: "chat-strip",
+      status: "running",
+      started_at: 12_345,
+    });
+
+    lastSocket().close();
+
+    expect(client.getRunStartedAt("chat-strip")).toBeNull();
+    expect(handler).toHaveBeenLastCalledWith("chat-strip", null);
+    await vi.advanceTimersByTimeAsync(20);
+    expect(FakeSocket.instances.length).toBeGreaterThan(1);
+  });
+
   it("clears run strip when a turn_end arrives without idle", () => {
     const client = new NanobotClient({
       url: "ws://test",