feat(GRO-1792): add recovery paths to booking error and cancellation pages

- Add "Start a new booking" button to BookingError linking to /admin/book
- Add "Book again" button to BookingCancelled linking to /admin/book
- Add business contact info section to BookingError (from BUSINESS_CONTACT_INFO constant)
- Replace hardcoded colors with CSS variables (--color-error, --color-cancelled, etc.)
- Add page-level string constants to eliminate hardcoded strings
- Add unit tests for both pages (9 tests passing)

Co-Authored-By: Paperclip <noreply@paperclip.ing>

src/__tests__/BookingCancelled.test.tsx

@@ -0,0 +1,27 @@
+import { describe, it, expect } from "vitest";
+import { render, screen } from "@testing-library/react";
+import { BookingCancelledPage } from "../pages/BookingCancelled.tsx";
+
+describe("BookingCancelledPage", () => {
+  it("renders the cancelled heading", () => {
+    render(<BookingCancelledPage />);
+    expect(screen.getByRole("heading", { name: /Appointment Cancelled/i })).toBeInTheDocument();
+  });
+
+  it("renders the cancelled body text", () => {
+    render(<BookingCancelledPage />);
+    expect(screen.getByText(/Your appointment has been cancelled/i)).toBeInTheDocument();
+  });
+
+  it("has a Book again link pointing to /admin/book", () => {
+    render(<BookingCancelledPage />);
+    const link = screen.getByRole("link", { name: /Book again/i });
+    expect(link).toHaveAttribute("href", "/admin/book");
+  });
+
+  it("has a Back to Portal link pointing to /", () => {
+    render(<BookingCancelledPage />);
+    const link = screen.getByRole("link", { name: /Back to Portal/i });
+    expect(link).toHaveAttribute("href", "/");
+  });
+});

src/__tests__/BookingError.test.tsx

@@ -0,0 +1,38 @@
+import { describe, it, expect } from "vitest";
+import { render, screen } from "@testing-library/react";
+import { BookingErrorPage } from "../pages/BookingError.tsx";
+import { BUSINESS_CONTACT_INFO } from "../lib/contact.ts";
+
+describe("BookingErrorPage", () => {
+  it("renders the error heading", () => {
+    render(<BookingErrorPage />);
+    expect(screen.getByRole("heading", { name: /Link Invalid or Expired/i })).toBeInTheDocument();
+  });
+
+  it("renders the error body text", () => {
+    render(<BookingErrorPage />);
+    expect(screen.getByText(/This confirmation link is invalid/i)).toBeInTheDocument();
+  });
+
+  it("has a Start a new booking link pointing to /admin/book", () => {
+    render(<BookingErrorPage />);
+    const link = screen.getByRole("link", { name: /Start a new booking/i });
+    expect(link).toHaveAttribute("href", "/admin/book");
+  });
+
+  it("has a Back to Portal link pointing to /", () => {
+    render(<BookingErrorPage />);
+    const link = screen.getByRole("link", { name: /Back to Portal/i });
+    expect(link).toHaveAttribute("href", "/");
+  });
+
+  it("displays business contact phone", () => {
+    render(<BookingErrorPage />);
+    expect(screen.getByText(BUSINESS_CONTACT_INFO.phone)).toBeInTheDocument();
+  });
+
+  it("displays business contact email", () => {
+    render(<BookingErrorPage />);
+    expect(screen.getByText(BUSINESS_CONTACT_INFO.email)).toBeInTheDocument();
+  });
+});

src/index.css

@@ -8,6 +8,19 @@
   --color-accent-dark: color-mix(in srgb, var(--color-accent) 78%, #000);
   --color-accent-light: color-mix(in srgb, var(--color-accent) 18%, #fff);
   --color-accent-lighter: color-mix(in srgb, var(--color-accent) 9%, #fff);
+
+  /* Semantic / booking page tokens */
+  --color-error: #dc2626;
+  --color-error-dark: #b91c1c;
+  --color-error-bg: #fef2f2;
+  --color-cancelled: #ea580c;
+  --color-cancelled-dark: #c2410c;
+  --color-cancelled-bg: #fff7ed;
+  --color-success: #16a34a;
+  --color-success-dark: #15803d;
+  --color-success-bg: #f0fdf4;
+  --color-text-secondary: #4b5563;
+  --color-surface: #fff;
 }
 
 *, *::before, *::after {

src/lib/contact.ts

@@ -0,0 +1,7 @@
+// Business contact information — update values to reflect actual business details.
+// Used on error/cancellation pages to help customers reach the business.
+export const BUSINESS_CONTACT_INFO = {
+  phone: "(555) 000-1234",
+  email: "hello@groombook.example.com",
+  address: "123 Main St, Anytown, USA",
+} as const;

src/pages/BookingCancelled.tsx

@@ -1,3 +1,10 @@
+const STRINGS = {
+  heading: "Appointment Cancelled",
+  body: "Your appointment has been cancelled. If this was a mistake or you'd like to rebook, please contact us.",
+  bookAgain: "Book again",
+  backToPortal: "Back to Portal",
+} as const;
+
 export function BookingCancelledPage() {
   return (
     <div
@@ -7,12 +14,12 @@ export function BookingCancelledPage() {
         alignItems: "center",
         justifyContent: "center",
         fontFamily: "system-ui, sans-serif",
-        background: "#fff7ed",
+        background: "var(--color-cancelled-bg)",
       }}
     >
       <div
         style={{
-          background: "#fff",
+          background: "var(--color-surface)",
           borderRadius: 12,
           padding: "2.5rem 3rem",
           boxShadow: "0 4px 24px rgba(0,0,0,0.08)",
@@ -21,28 +28,45 @@ export function BookingCancelledPage() {
         }}
       >
         <div style={{ fontSize: 56, marginBottom: "0.5rem" }}>✗</div>
-        <h1 style={{ color: "#c2410c", fontSize: 24, margin: "0 0 0.5rem" }}>
-          Appointment Cancelled
+        <h1 style={{ color: "var(--color-cancelled-dark)", fontSize: 24, margin: "0 0 0.5rem" }}>
+          {STRINGS.heading}
         </h1>
-        <p style={{ color: "#4b5563", margin: "0 0 1.5rem" }}>
-          Your appointment has been cancelled. If this was a mistake or you'd
-          like to rebook, please contact us.
+        <p style={{ color: "var(--color-text-secondary)", margin: "0 0 1.5rem" }}>
+          {STRINGS.body}
         </p>
-        <a
-          href="/"
-          style={{
-            display: "inline-block",
-            padding: "0.6rem 1.5rem",
-            background: "#ea580c",
-            color: "#fff",
-            borderRadius: 6,
-            textDecoration: "none",
-            fontWeight: 600,
-            fontSize: 14,
-          }}
-        >
-          Back to Portal
-        </a>
+
+        <div style={{ display: "flex", flexDirection: "column", gap: "0.75rem", alignItems: "center" }}>
+          <a
+            href="/admin/book"
+            style={{
+              display: "inline-block",
+              padding: "0.6rem 1.5rem",
+              background: "var(--color-primary)",
+              color: "#fff",
+              borderRadius: 6,
+              textDecoration: "none",
+              fontWeight: 600,
+              fontSize: 14,
+            }}
+          >
+            {STRINGS.bookAgain}
+          </a>
+          <a
+            href="/"
+            style={{
+              display: "inline-block",
+              padding: "0.6rem 1.5rem",
+              background: "var(--color-cancelled)",
+              color: "#fff",
+              borderRadius: 6,
+              textDecoration: "none",
+              fontWeight: 600,
+              fontSize: 14,
+            }}
+          >
+            {STRINGS.backToPortal}
+          </a>
+        </div>
       </div>
     </div>
   );

src/pages/BookingError.tsx

@@ -1,3 +1,13 @@
+import { BUSINESS_CONTACT_INFO } from "../lib/contact";
+
+const STRINGS = {
+  heading: "Link Invalid or Expired",
+  body: "This confirmation link is invalid, has already been used, or your appointment has already passed. Please contact us if you need help.",
+  newBooking: "Start a new booking",
+  backToPortal: "Back to Portal",
+  contactLabel: "Need help?",
+} as const;
+
 export function BookingErrorPage() {
   return (
     <div
@@ -7,12 +17,12 @@ export function BookingErrorPage() {
         alignItems: "center",
         justifyContent: "center",
         fontFamily: "system-ui, sans-serif",
-        background: "#fef2f2",
+        background: "var(--color-error-bg)",
       }}
     >
       <div
         style={{
-          background: "#fff",
+          background: "var(--color-surface)",
           borderRadius: 12,
           padding: "2.5rem 3rem",
           boxShadow: "0 4px 24px rgba(0,0,0,0.08)",
@@ -21,28 +31,52 @@ export function BookingErrorPage() {
         }}
       >
         <div style={{ fontSize: 56, marginBottom: "0.5rem" }}>⚠️</div>
-        <h1 style={{ color: "#b91c1c", fontSize: 24, margin: "0 0 0.5rem" }}>
-          Link Invalid or Expired
+        <h1 style={{ color: "var(--color-error-dark)", fontSize: 24, margin: "0 0 0.5rem" }}>
+          {STRINGS.heading}
         </h1>
-        <p style={{ color: "#4b5563", margin: "0 0 1.5rem" }}>
-          This confirmation link is invalid, has already been used, or your
-          appointment has already passed. Please contact us if you need help.
+        <p style={{ color: "var(--color-text-secondary)", margin: "0 0 1.5rem" }}>
+          {STRINGS.body}
         </p>
-        <a
-          href="/"
-          style={{
-            display: "inline-block",
-            padding: "0.6rem 1.5rem",
-            background: "#dc2626",
-            color: "#fff",
-            borderRadius: 6,
-            textDecoration: "none",
-            fontWeight: 600,
-            fontSize: 14,
-          }}
-        >
-          Back to Portal
-        </a>
+
+        <div style={{ display: "flex", flexDirection: "column", gap: "0.75rem", alignItems: "center" }}>
+          <a
+            href="/admin/book"
+            style={{
+              display: "inline-block",
+              padding: "0.6rem 1.5rem",
+              background: "var(--color-primary)",
+              color: "#fff",
+              borderRadius: 6,
+              textDecoration: "none",
+              fontWeight: 600,
+              fontSize: 14,
+            }}
+          >
+            {STRINGS.newBooking}
+          </a>
+          <a
+            href="/"
+            style={{
+              display: "inline-block",
+              padding: "0.6rem 1.5rem",
+              background: "var(--color-error)",
+              color: "#fff",
+              borderRadius: 6,
+              textDecoration: "none",
+              fontWeight: 600,
+              fontSize: 14,
+            }}
+          >
+            {STRINGS.backToPortal}
+          </a>
+        </div>
+
+        <div style={{ marginTop: "1.5rem", paddingTop: "1rem", borderTop: "1px solid #e5e7eb", fontSize: 13, color: "var(--color-text-secondary)" }}>
+          <p style={{ margin: "0 0 0.25rem", fontWeight: 600 }}>{STRINGS.contactLabel}</p>
+          <p style={{ margin: 0 }}>
+            {BUSINESS_CONTACT_INFO.phone} · {BUSINESS_CONTACT_INFO.email}
+          </p>
+        </div>
       </div>
     </div>
   );