fix: complete dashboard hydration

scripts/__tests__/ci-determinism.test.ts

@@ -45,13 +45,31 @@ describe("Playwright CI determinism", () => {
     expect(config.retries).toBe(2);
     expect(config.failOnFlakyTests).toBe(true);
     expect(config.reporter).toEqual([["github"], ["html", { open: "never" }]]);
-    expect(config.webServer).toMatchObject({
-      command: expect.stringContaining(
-        `${JSON.stringify(process.execPath)} .next/standalone/server.js`,
-      ),
-      env: expect.objectContaining({
-        NATIVE_CANVAS: "off",
-      }),
+    // Two servers, and which is which matters. The suite's own server runs
+    // with the dashboard's RSC prefetch OFF so `page.route` fixtures govern
+    // what the dashboard paints; the second runs it ON, which is the default
+    // and therefore the only configuration self-hosters ever see. A React #418
+    // hydration bailout shipped on `/` precisely because nothing in CI ran the
+    // shipped one. Pin both so that gap cannot reopen by deletion.
+    const servers = config.webServer;
+    expect(Array.isArray(servers)).toBe(true);
+    const webServers = servers as Array<Record<string, unknown>>;
+    expect(webServers).toHaveLength(2);
+    for (const server of webServers) {
+      expect(server).toMatchObject({
+        command: expect.stringContaining(
+          `${JSON.stringify(process.execPath)} .next/standalone/server.js`,
+        ),
+        env: expect.objectContaining({
+          NATIVE_CANVAS: "off",
+        }),
+      });
+    }
+    expect(webServers[0]!.env).toMatchObject({
+      DASHBOARD_SSR_PREFETCH: "false",
+    });
+    expect(webServers[1]!.env).toMatchObject({
+      DASHBOARD_SSR_PREFETCH: "true",
     });
   });