Add SummaryStep, PaymentStep, ConfirmationStep (wizard steps 13-15)

SummaryStep (step 13):
- Accordion sections with edit IconButtons linking back to each step
- dl/dt/dd definition list for label-value pairs
- Total bar with prominent price display (aria-live)
- Share plan icon button, deposit display
- Pre-planning: "Save your plan" CTA; at-need: "Confirm" CTA

PaymentStep (step 14):
- Payment plan (full/deposit) shown before method (amount before how)
- ToggleButtonGroup for plan + method selection
- Card: PayWay iframe slot with placeholder; Bank: account details display
- Terms checkbox with service agreement + privacy links
- Security reassurance (lock icon, no-surprise copy)

ConfirmationStep (step 15):
- Terminal page — no back button, no progress indicator
- At-need: "submitted" + callback timeframe + arranger contact
- Pre-planning: "saved" + return-anytime + family-ready copy
- Muted success icon (not celebratory), next-steps link buttons
- VenueCard selected prop also staged (from step 7 work)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/components/pages/SummaryStep/SummaryStep.stories.tsx

@@ -0,0 +1,150 @@
+import type { Meta, StoryObj } from '@storybook/react';
+import { SummaryStep } from './SummaryStep';
+import type { SummarySection } from './SummaryStep';
+import { Navigation } from '../../organisms/Navigation';
+import Box from '@mui/material/Box';
+
+// ─── Helpers ─────────────────────────────────────────────────────────────────
+
+const FALogo = () => (
+  <Box sx={{ display: 'flex', alignItems: 'center' }}>
+    <Box
+      component="img"
+      src="/brandlogo/logo-full.svg"
+      alt="Funeral Arranger"
+      sx={{ height: 28, display: { xs: 'none', md: 'block' } }}
+    />
+    <Box
+      component="img"
+      src="/brandlogo/logo-short.svg"
+      alt="Funeral Arranger"
+      sx={{ height: 28, display: { xs: 'block', md: 'none' } }}
+    />
+  </Box>
+);
+
+const nav = (
+  <Navigation
+    logo={<FALogo />}
+    items={[
+      { label: 'FAQ', href: '/faq' },
+      { label: 'Contact Us', href: '/contact' },
+    ]}
+  />
+);
+
+const sampleSections: SummarySection[] = [
+  {
+    id: 'provider',
+    title: 'Funeral Provider',
+    editStepId: 'providers',
+    items: [
+      { label: 'Provider', value: 'H. Parsons Funeral Directors' },
+      { label: 'Package', value: 'Essential Service Package', price: 4950 },
+    ],
+  },
+  {
+    id: 'venue',
+    title: 'Service Venue',
+    editStepId: 'venue',
+    items: [
+      { label: 'Venue', value: 'West Chapel, Strathfield', price: 900 },
+      { label: 'Photo presentation', value: 'Included', price: 150 },
+      { label: 'Livestream', value: 'Included', price: 200 },
+    ],
+  },
+  {
+    id: 'crematorium',
+    title: 'Crematorium',
+    editStepId: 'crematorium',
+    items: [
+      { label: 'Crematorium', value: 'Warrill Park Crematorium', price: 850 },
+      { label: 'Following hearse', value: 'Yes' },
+    ],
+  },
+  {
+    id: 'coffin',
+    title: 'Coffin',
+    editStepId: 'coffins',
+    items: [
+      { label: 'Coffin', value: 'Cedar Classic', price: 2800 },
+      { label: 'Handles', value: 'Brass Bar Handle', price: 0 },
+      { label: 'Lining', value: 'White Satin', price: 0 },
+    ],
+  },
+  {
+    id: 'services',
+    title: 'Additional Services',
+    editStepId: 'additional_services',
+    items: [
+      { label: 'Funeral announcement', value: 'Included' },
+      { label: 'Bearing', value: 'Family and friends' },
+    ],
+  },
+];
+
+// ─── Meta ────────────────────────────────────────────────────────────────────
+
+const meta: Meta<typeof SummaryStep> = {
+  title: 'Pages/SummaryStep',
+  component: SummaryStep,
+  tags: ['autodocs'],
+  parameters: {
+    layout: 'fullscreen',
+  },
+};
+
+export default meta;
+type Story = StoryObj<typeof SummaryStep>;
+
+// ─── At-need (default) ──────────────────────────────────────────────────────
+
+/** Full summary for at-need flow */
+export const Default: Story = {
+  render: () => (
+    <SummaryStep
+      sections={sampleSections}
+      totalPrice={9850}
+      depositAmount={2000}
+      onConfirm={() => alert('Confirmed — proceed to payment')}
+      onBack={() => alert('Back')}
+      onSaveAndExit={() => alert('Save')}
+      onEdit={(stepId) => alert(`Edit: ${stepId}`)}
+      onShare={() => alert('Share plan')}
+      navigation={nav}
+    />
+  ),
+};
+
+// ─── Pre-planning ───────────────────────────────────────────────────────────
+
+/** Pre-planning variant — "Save your plan" CTA, no payment */
+export const PrePlanning: Story = {
+  render: () => (
+    <SummaryStep
+      sections={sampleSections}
+      totalPrice={9850}
+      onConfirm={() => alert('Plan saved')}
+      onBack={() => alert('Back')}
+      onEdit={(stepId) => alert(`Edit: ${stepId}`)}
+      onShare={() => alert('Share plan')}
+      isPrePlanning
+      navigation={nav}
+    />
+  ),
+};
+
+// ─── Loading ────────────────────────────────────────────────────────────────
+
+/** Confirm button loading */
+export const Loading: Story = {
+  render: () => (
+    <SummaryStep
+      sections={sampleSections}
+      totalPrice={9850}
+      onConfirm={() => {}}
+      loading
+      navigation={nav}
+    />
+  ),
+};