fix live analysis multi-device lock

tests/e2e/app.spec.ts

@@ -78,6 +78,20 @@ test("live camera switches into viewer mode when another device already owns ana
   await expect(page.getByTestId("live-camera-score-overall")).toBeVisible();
 });
 
+test("live camera retries viewer stream when owner track is not ready on first attempt", async ({ page }) => {
+  const state = await installAppMocks(page, {
+    authenticated: true,
+    liveViewerMode: true,
+    viewerSignalConflictOnce: true,
+  });
+
+  await page.goto("/live-camera");
+  await expect(page.getByText("同步观看模式")).toBeVisible();
+  await expect.poll(() => state.viewerSignalConflictRemaining).toBe(0);
+  await expect.poll(() => state.mediaSession?.viewerCount ?? 0).toBe(1);
+  await expect(page.getByText(/同步观看中|重新同步/).first()).toBeVisible();
+});
+
 test("live camera archives overlay videos into the library after analysis stops", async ({ page }) => {
   await installAppMocks(page, { authenticated: true, videos: [] });
 
@@ -126,3 +140,11 @@ test("recorder flow archives a session and exposes it in videos", async ({ page
   await expect(page.getByTestId("video-card")).toHaveCount(1);
   await expect(page.getByText("E2E 录制")).toBeVisible();
 });
+
+test("recorder blocks local camera when another device owns live analysis", async ({ page }) => {
+  await installAppMocks(page, { authenticated: true, liveViewerMode: true });
+
+  await page.goto("/recorder");
+  await expect(page.getByText("当前账号已有其他设备正在实时分析")).toBeVisible();
+  await expect(page.getByTestId("recorder-start-camera-button")).toBeDisabled();
+});