diff --git a/.gitignore b/.gitignore
index 729a784..d73b7a4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,4 +5,14 @@ node_modules/
 dist/
 playwright-report/
 test-results/
-*.log
\ No newline at end of file
+*.log
+# Agent runtime artifacts — never commit
+.gh-token
+*.gh-token
+**/.gh-token
+.config/gh/
+**/.config/gh/
+**/AGENT_HOME/**
+$AGENT_HOME/**
+.claude/
+.codex/
diff --git a/UAT_PLAYBOOK.md b/UAT_PLAYBOOK.md
index 59d6de8..9bbef37 100644
--- a/UAT_PLAYBOOK.md
+++ b/UAT_PLAYBOOK.md
@@ -86,7 +86,7 @@ export const { signIn, signOut, useSession, changePassword } = authClient;
 | # | Scenario | Steps | Pass Criteria | Fail Criteria |
 |---|----------|-------|---------------|---------------|
 | TC-WEB-SSO-1 | Sign-in page shows SSO button | Navigate to app root URL | Sign-in page displayed with "Sign in with SSO" button visible | No SSO button, 403 before page loads |
-| TC-WEB-SSO-2 | Click SSO redirects to Authentik | Click "Sign in with SSO" button | Browser redirected to Authentik login at auth.farh.net | No redirect, error shown, button does nothing |
+| TC-WEB-SSO-2 | Click SSO redirects to Authentik (GRO-2572) | **Fresh session only (no pre-existing auth cookie).** Click "Sign in with SSO" button | Browser navigates to Authentik login at auth.farh.net within ~1 s — address bar changes to auth.farh.net URL | No redirect, error shown, button stays disabled, user remains on /login. Regression: prior to GRO-2572 fix the client never followed the `data.url` returned by Better Auth. Run from a clean incognito context to avoid a stale cookie masking the defect. |
 | TC-WEB-SSO-3 | Valid OIDC credentials authenticate | At Authentik, enter valid credentials and authenticate | Redirected back to app with active session | Redirect loop, 403, session not established |
 | TC-WEB-SSO-4 | Post-login dashboard accessible | After SSO flow completes, dashboard loads | Dashboard displays correctly with user identity shown | Blank page, 403, session not active |
 | TC-WEB-SSO-5 | User identity displayed correctly | After SSO login, check header/nav | User name/email/initials shown in nav, role reflected in UI | No user indicator, wrong user shown |
@@ -320,6 +320,15 @@ the seeded UAT customer (`uat-customer@groombook.dev`), not just unit-rendered.
 | TC-WEB-5.16.2 | PWA install prompt | Load app on supported browser | Install prompt appears when criteria met |
 | TC-WEB-5.16.3 | Touch interactions | Use touch gestures on mobile | All interactions work with touch input |
 
+#### 5.16a Portal Tab Rows — Mobile Overflow (GRO-730 / GRO-1026)
+
+| # | Scenario | Steps | Expected |
+|---|----------|-------|----------|
+| TC-WEB-5.16.4 | My Pets tab row — horizontal scroll, no visible scrollbar | Sign in as customer → My Pets. Set viewport to 390px. If 3+ pets are seeded, the pet-selector row overflows. | Pet selector row scrolls horizontally; native scrollbar is **not** visible (`scrollbar-width: none` / `scrollbar-hide` applied). |
+| TC-WEB-5.16.5 | My Pets section tab row — no visible scrollbar | On the same My Pets view, observe the tabs row (Basic Info / Medical / Grooming / History). | Tabs row scrolls horizontally when needed; native scrollbar is not visible. |
+| TC-WEB-5.16.6 | Billing/Payments tab row — no wrap, no visible scrollbar | Sign in as customer → Billing/Payments at 390px. | Tab row (Invoices / Payment Methods / Packages) does **not** wrap to a second line; scrolls horizontally if needed; native scrollbar not visible. |
+| TC-WEB-5.16.7 | Desktop — no visual regression | Open My Pets and Billing/Payments at ≥1024px. | No layout change; tab rows display identically to before the fix. |
+
 ### 5.17 Error & Empty States
 
 | # | Scenario | Steps | Expected |
diff --git a/src/App.tsx b/src/App.tsx
index d6a8057..bf98a37 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -45,6 +45,12 @@ function LoginPage() {
     if (result?.error) {
       setError(result.error.message ?? "Sign-in failed");
       setIsLoading(false);
+      return;
+    }
+    // Better Auth returns the IdP authorize URL in data.url with redirect:true rather than
+    // issuing an HTTP 30x — the client must follow it (GRO-2572).
+    if (result?.data?.url) {
+      window.location.href = result.data.url;
     }
   };
 
diff --git a/src/__tests__/App.test.tsx b/src/__tests__/App.test.tsx
index edddc4f..c0d898d 100644
--- a/src/__tests__/App.test.tsx
+++ b/src/__tests__/App.test.tsx
@@ -1,5 +1,6 @@
 import { describe, it, expect, vi, beforeEach } from "vitest";
 import { render, screen, within, waitFor } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
 import { MemoryRouter } from "react-router-dom";
 import { App } from "../App";
 
@@ -232,6 +233,7 @@ describe("Dev login selector", () => {
   });
 
   it("does not redirect when a dev user is already selected", async () => {
+
     localStorage.setItem("dev-user", JSON.stringify({ type: "staff", id: "s1", name: "Sarah" }));
 
     global.fetch = vi.fn((url: string) => {
@@ -269,3 +271,61 @@ describe("Dev login selector", () => {
     ).toBeInTheDocument();
   });
 });
+
+describe("GRO-2572 — SSO button follows redirect URL", () => {
+  it("navigates to data.url when signIn.social returns a redirect", async () => {
+    // Mock signIn.social to return the redirect payload Better Auth sends
+    vi.mock("../lib/auth-client.js", () => ({
+      useSession: () => ({ data: null, isPending: false }),
+      signIn: {
+        social: vi.fn().mockResolvedValue({
+          data: { redirect: true, url: "https://auth.farh.net/application/o/authorize/?test=1" },
+          error: null,
+        }),
+      },
+      signOut: vi.fn(),
+      changePassword: vi.fn(),
+    }));
+
+    const assignMock = vi.fn();
+    Object.defineProperty(window, "location", {
+      value: { ...window.location, href: "", origin: "https://uat.groombook.dev" },
+      writable: true,
+    });
+    Object.defineProperty(window.location, "href", {
+      set: assignMock,
+      get: () => "",
+    });
+
+    global.fetch = vi.fn((url: string) => {
+      if (url === "/api/dev/config") {
+        return Promise.resolve({ ok: true, json: async () => ({ authDisabled: false }) } as Response);
+      }
+      if (url === "/api/auth/get-session") {
+        return Promise.resolve({ ok: true, json: async () => null } as unknown as Response);
+      }
+      if (url === "/api/setup/status") {
+        return Promise.resolve({ ok: true, json: async () => ({ needsSetup: false }) } as Response);
+      }
+      if (url === "/api/auth/providers") {
+        return Promise.resolve({ ok: true, json: async () => ({ providers: ["authentik"] }) } as Response);
+      }
+      return Promise.resolve({ ok: true, json: async () => [] } as Response);
+    }) as unknown as typeof fetch;
+
+    render(
+      <MemoryRouter initialEntries={["/login"]}>
+        <App />
+      </MemoryRouter>
+    );
+
+    const ssoButton = await screen.findByRole("button", { name: /sign in with sso/i });
+    await userEvent.click(ssoButton);
+
+    await waitFor(() => {
+      expect(assignMock).toHaveBeenCalledWith(
+        "https://auth.farh.net/application/o/authorize/?test=1"
+      );
+    });
+  });
+});
diff --git a/src/index.css b/src/index.css
index 32b3b5e..0ccb242 100644
--- a/src/index.css
+++ b/src/index.css
@@ -78,6 +78,15 @@ input:focus, select:focus, textarea:focus {
   box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
 }
 
+/* ─── Scrollbar hide utility ─── */
+.scrollbar-hide {
+  scrollbar-width: none;
+  -ms-overflow-style: none;
+}
+.scrollbar-hide::-webkit-scrollbar {
+  display: none;
+}
+
 /* ─── Scrollbar polish ─── */
 ::-webkit-scrollbar {
   width: 6px;
diff --git a/src/portal/sections/BillingPayments.tsx b/src/portal/sections/BillingPayments.tsx
index e4d2902..be6610c 100644
--- a/src/portal/sections/BillingPayments.tsx
+++ b/src/portal/sections/BillingPayments.tsx
@@ -130,7 +130,7 @@ function BillingPaymentsInner({ sessionId, readOnly }: BillingPaymentsProps) {
         </div>
       )}
 
-      <div className="flex gap-2 flex-wrap">
+      <div className="flex gap-2 overflow-x-auto scrollbar-hide">
         {([
           { id: "invoices" as const, label: "Invoices", icon: DollarSign },
           { id: "payment" as const, label: "Payment Methods", icon: CreditCard },
diff --git a/src/portal/sections/PetProfiles.tsx b/src/portal/sections/PetProfiles.tsx
index 7fe0cf2..12e462f 100644
--- a/src/portal/sections/PetProfiles.tsx
+++ b/src/portal/sections/PetProfiles.tsx
@@ -145,7 +145,7 @@ export function PetProfiles({ sessionId, readOnly }: Props) {
   return (
     <div className="space-y-6">
       {/* Pet Selector */}
-      <div className="flex gap-3 overflow-x-auto pb-1">
+      <div className="flex gap-3 overflow-x-auto pb-1 scrollbar-hide">
         {pets.map(p => (
           <button
             key={p.id}
@@ -191,7 +191,7 @@ export function PetProfiles({ sessionId, readOnly }: Props) {
       )}
 
       {/* Tabs */}
-      <div className="flex gap-1 bg-white rounded-xl border border-stone-200 p-1 overflow-x-auto">
+      <div className="flex gap-1 bg-white rounded-xl border border-stone-200 p-1 overflow-x-auto scrollbar-hide">
         {([
           { id: "info", label: "Basic Info", icon: PawPrint },
           { id: "medical", label: "Medical", icon: Heart },