perf: speed up initial chat, channels, skills, and cron loading (#901)

tests/unit/cron-store-fetch-dedupe.test.ts

@@ -0,0 +1,52 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+
+const hostApiFetchMock = vi.fn();
+
+vi.mock('@/lib/host-api', () => ({
+  hostApiFetch: (...args: unknown[]) => hostApiFetchMock(...args),
+}));
+
+vi.mock('@/stores/chat', () => ({
+  useChatStore: {
+    getState: () => ({
+      currentAgentId: 'main',
+    }),
+  },
+}));
+
+function deferred<T>() {
+  let resolve!: (value: T) => void;
+  let reject!: (reason?: unknown) => void;
+  const promise = new Promise<T>((res, rej) => {
+    resolve = res;
+    reject = rej;
+  });
+  return { promise, resolve, reject };
+}
+
+describe('cron store fetchJobs dedupe', () => {
+  beforeEach(() => {
+    vi.resetModules();
+    vi.clearAllMocks();
+  });
+
+  it('reuses in-flight fetchJobs request when called concurrently', async () => {
+    const listDeferred = deferred<Array<{ id: string }>>();
+    hostApiFetchMock.mockReturnValueOnce(listDeferred.promise);
+
+    const { useCronStore } = await import('@/stores/cron');
+    useCronStore.setState({ jobs: [], loading: false, error: null });
+
+    const first = useCronStore.getState().fetchJobs();
+    const second = useCronStore.getState().fetchJobs();
+    await Promise.resolve();
+
+    expect(hostApiFetchMock).toHaveBeenCalledTimes(1);
+    expect(hostApiFetchMock).toHaveBeenCalledWith('/api/cron/jobs');
+
+    listDeferred.resolve([{ id: 'job-1' }]);
+    await Promise.all([first, second]);
+
+    expect(useCronStore.getState().jobs.map((job) => job.id)).toEqual(['job-1']);
+  });
+});