fix(production) : prevent hydration and service failures

tests/public-performance.test.ts

@@ -72,6 +72,8 @@ describe("public rendering performance", () => {
     expect(adsense).not.toContain('from "@/lib/auth/client"');
     expect(adsense).toContain('process.env.NODE_ENV !== "production"');
     expect(adsense).toContain("pagead2.googlesyndication.com");
+    expect(adsense).toContain("<script");
+    expect(adsense).not.toContain('from "next/script"');
     expect(home).toContain("<GoogleAdsense />");
     expect(guide).toContain("<GoogleAdsense />");
     expect(guideSection).toContain("<GoogleAdsense />");
@@ -79,4 +81,17 @@ describe("public rendering performance", () => {
       "google.com, pub-9687404323559597, DIRECT, f08c47fec0942fa0",
     );
   });
+
+  it("allows the production analytics and advertising endpoints", async () => {
+    const headers = await repositoryFile("lib/security/headers.ts");
+
+    expect(headers).toContain("https://static.cloudflareinsights.com");
+    expect(headers).toContain("https://*.adtrafficquality.google");
+  });
+
+  it("accepts Next.js deployment metadata on the document root", async () => {
+    const layout = await repositoryFile("app/layout.tsx");
+
+    expect(layout).toContain("suppressHydrationWarning");
+  });
 });