Add IconButton, Divider, and Link atom components

IconButton:
- Wraps MUI IconButton with FA theme (focus ring, brand hover colours)
- 3 sizes reusing Button height tokens: small 32px, medium 40px, large 48px
- 5 stories: Default, Sizes, Colours, States, CommonUseCases

Divider:
- Wraps MUI Divider with FA border token
- Horizontal/vertical, fullWidth/inset/middle variants, text support
- 6 stories: Default, Variants, Vertical, WithText, InContent, NavigationList

Link:
- Wraps MUI Link with FA brand colour (copper brand.600, 4.8:1 contrast)
- Underline on hover by default, focus-visible ring, fontWeight 500
- 7 stories: Default, UnderlineVariants, ColourVariants, Inline, Navigation,
  FooterLinks, OnDifferentBackgrounds

Theme: Added MuiIconButton, MuiDivider, MuiLink overrides

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

src/components/atoms/Divider/Divider.stories.tsx

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+import type { Meta, StoryObj } from '@storybook/react';
+import { Divider } from './Divider';
+import Box from '@mui/material/Box';
+
+const meta: Meta<typeof Divider> = {
+  title: 'Atoms/Divider',
+  component: Divider,
+  tags: ['autodocs'],
+  argTypes: {
+    orientation: { control: 'select', options: ['horizontal', 'vertical'] },
+    variant: { control: 'select', options: ['fullWidth', 'inset', 'middle'] },
+    light: { control: 'boolean' },
+  },
+};
+
+export default meta;
+type Story = StoryObj<typeof Divider>;
+
+// ─── Default ────────────────────────────────────────────────────────────────
+
+export const Default: Story = {
+  decorators: [(Story) => <Box sx={{ width: 400 }}><Story /></Box>],
+};
+
+// ─── Variants ───────────────────────────────────────────────────────────────
+
+/** fullWidth, inset, and middle variants */
+export const Variants: Story = {
+  render: () => (
+    <Box sx={{ width: 400, display: 'flex', flexDirection: 'column', gap: 2 }}>
+      <Box>
+        <Box sx={{ fontSize: 12, color: 'text.secondary', mb: 1 }}>fullWidth (default)</Box>
+        <Divider />
+      </Box>
+      <Box>
+        <Box sx={{ fontSize: 12, color: 'text.secondary', mb: 1 }}>inset</Box>
+        <Divider variant="inset" />
+      </Box>
+      <Box>
+        <Box sx={{ fontSize: 12, color: 'text.secondary', mb: 1 }}>middle</Box>
+        <Divider variant="middle" />
+      </Box>
+    </Box>
+  ),
+};
+
+// ─── Vertical ───────────────────────────────────────────────────────────────
+
+/** Vertical divider inside a flex container */
+export const Vertical: Story = {
+  render: () => (
+    <Box sx={{ display: 'flex', alignItems: 'center', gap: 2, height: 40 }}>
+      <Box>Left</Box>
+      <Divider orientation="vertical" flexItem />
+      <Box>Right</Box>
+    </Box>
+  ),
+};
+
+// ─── With Text ──────────────────────────────────────────────────────────────
+
+/** Divider with centered text (MUI "textAlign" support) */
+export const WithText: Story = {
+  name: 'With Text',
+  render: () => (
+    <Box sx={{ width: 400, display: 'flex', flexDirection: 'column', gap: 3 }}>
+      <Divider>OR</Divider>
+      <Divider textAlign="left">Section</Divider>
+      <Divider textAlign="right">End</Divider>
+    </Box>
+  ),
+};
+
+// ─── In Content ─────────────────────────────────────────────────────────────
+
+/** Dividers separating content sections */
+export const InContent: Story = {
+  name: 'In Content',
+  render: () => (
+    <Box sx={{ width: 400, p: 3, border: '1px solid', borderColor: 'divider', borderRadius: 1 }}>
+      <Box sx={{ fontWeight: 600, mb: 1 }}>Service Details</Box>
+      <Box sx={{ fontSize: 14, color: 'text.secondary', mb: 2 }}>
+        Chapel service with traditional ceremony
+      </Box>
+      <Divider />
+      <Box sx={{ fontWeight: 600, mt: 2, mb: 1 }}>Venue</Box>
+      <Box sx={{ fontSize: 14, color: 'text.secondary', mb: 2 }}>
+        West Chapel, Strathfield
+      </Box>
+      <Divider />
+      <Box sx={{ fontWeight: 600, mt: 2, mb: 1 }}>Total</Box>
+      <Box sx={{ fontSize: 14, color: 'text.primary' }}>$2,400</Box>
+    </Box>
+  ),
+};
+
+// ─── Navigation List ────────────────────────────────────────────────────────
+
+/** Dividers between navigation items (footer pattern) */
+export const NavigationList: Story = {
+  name: 'Navigation List',
+  render: () => (
+    <Box sx={{ display: 'flex', alignItems: 'center', gap: 1.5, height: 20 }}>
+      <Box sx={{ fontSize: 14, color: 'text.secondary' }}>FAQ</Box>
+      <Divider orientation="vertical" flexItem />
+      <Box sx={{ fontSize: 14, color: 'text.secondary' }}>Contact Us</Box>
+      <Divider orientation="vertical" flexItem />
+      <Box sx={{ fontSize: 14, color: 'text.secondary' }}>Privacy</Box>
+      <Divider orientation="vertical" flexItem />
+      <Box sx={{ fontSize: 14, color: 'text.secondary' }}>Terms</Box>
+    </Box>
+  ),
+};

src/components/atoms/Divider/Divider.tsx

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+import React from 'react';
+import MuiDivider from '@mui/material/Divider';
+import type { DividerProps as MuiDividerProps } from '@mui/material/Divider';
+
+// ─── Types ───────────────────────────────────────────────────────────────────
+
+/** Props for the FA Divider component */
+export interface DividerProps extends MuiDividerProps {}
+
+// ─── Component ───────────────────────────────────────────────────────────────
+
+/**
+ * Visual separator for the FA design system.
+ *
+ * Thin line for separating content sections, navigation groups, or
+ * list items. Wraps MUI Divider with FA border tokens.
+ *
+ * Orientations:
+ * - `horizontal` (default) — full-width horizontal line
+ * - `vertical` — full-height vertical line (use inside flex containers)
+ *
+ * Variants:
+ * - `fullWidth` (default) — spans the full container
+ * - `inset` — indented from the left (for list item separators)
+ * - `middle` — indented from both sides
+ *
+ * Usage:
+ * ```tsx
+ * <Divider />
+ * <Divider orientation="vertical" flexItem />
+ * <Divider variant="inset" />
+ * ```
+ */
+export const Divider = React.forwardRef<HTMLHRElement, DividerProps>(
+  (props, ref) => {
+    return <MuiDivider ref={ref} {...props} />;
+  },
+);
+
+Divider.displayName = 'Divider';
+export default Divider;

src/components/atoms/Divider/index.ts

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+export { Divider, default } from './Divider';
+export type { DividerProps } from './Divider';

src/components/atoms/IconButton/IconButton.stories.tsx

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+import type { Meta, StoryObj } from '@storybook/react';
+import { IconButton } from './IconButton';
+import Box from '@mui/material/Box';
+import CloseIcon from '@mui/icons-material/Close';
+import MenuIcon from '@mui/icons-material/Menu';
+import DeleteOutlineIcon from '@mui/icons-material/DeleteOutline';
+import EditOutlinedIcon from '@mui/icons-material/EditOutlined';
+import SearchIcon from '@mui/icons-material/Search';
+import MoreVertIcon from '@mui/icons-material/MoreVert';
+import FavoriteBorderIcon from '@mui/icons-material/FavoriteBorder';
+import ShareOutlinedIcon from '@mui/icons-material/ShareOutlined';
+
+const meta: Meta<typeof IconButton> = {
+  title: 'Atoms/IconButton',
+  component: IconButton,
+  tags: ['autodocs'],
+  argTypes: {
+    size: { control: 'select', options: ['small', 'medium', 'large'] },
+    color: { control: 'select', options: ['default', 'primary', 'secondary', 'error'] },
+    disabled: { control: 'boolean' },
+  },
+};
+
+export default meta;
+type Story = StoryObj<typeof IconButton>;
+
+// ─── Default ────────────────────────────────────────────────────────────────
+
+export const Default: Story = {
+  args: {
+    'aria-label': 'Close',
+    children: <CloseIcon />,
+  },
+};
+
+// ─── Sizes ──────────────────────────────────────────────────────────────────
+
+/** Three sizes matching Button height scale */
+export const Sizes: Story = {
+  render: () => (
+    <Box sx={{ display: 'flex', alignItems: 'center', gap: 2 }}>
+      <Box sx={{ textAlign: 'center' }}>
+        <IconButton size="small" aria-label="Search">
+          <SearchIcon />
+        </IconButton>
+        <Box sx={{ fontSize: 11, color: 'text.secondary', mt: 0.5 }}>small (32px)</Box>
+      </Box>
+      <Box sx={{ textAlign: 'center' }}>
+        <IconButton size="medium" aria-label="Search">
+          <SearchIcon />
+        </IconButton>
+        <Box sx={{ fontSize: 11, color: 'text.secondary', mt: 0.5 }}>medium (40px)</Box>
+      </Box>
+      <Box sx={{ textAlign: 'center' }}>
+        <IconButton size="large" aria-label="Search">
+          <SearchIcon />
+        </IconButton>
+        <Box sx={{ fontSize: 11, color: 'text.secondary', mt: 0.5 }}>large (48px)</Box>
+      </Box>
+    </Box>
+  ),
+};
+
+// ─── Colours ────────────────────────────────────────────────────────────────
+
+/** Colour options for different contexts */
+export const Colours: Story = {
+  name: 'Colours',
+  render: () => (
+    <Box sx={{ display: 'flex', alignItems: 'center', gap: 2 }}>
+      <IconButton color="default" aria-label="Menu">
+        <MenuIcon />
+      </IconButton>
+      <IconButton color="primary" aria-label="Edit">
+        <EditOutlinedIcon />
+      </IconButton>
+      <IconButton color="secondary" aria-label="More options">
+        <MoreVertIcon />
+      </IconButton>
+      <IconButton color="error" aria-label="Delete">
+        <DeleteOutlineIcon />
+      </IconButton>
+    </Box>
+  ),
+};
+
+// ─── States ─────────────────────────────────────────────────────────────────
+
+/** Interactive states: default, hover (try it), disabled */
+export const States: Story = {
+  render: () => (
+    <Box sx={{ display: 'flex', alignItems: 'center', gap: 2 }}>
+      <Box sx={{ textAlign: 'center' }}>
+        <IconButton aria-label="Default">
+          <CloseIcon />
+        </IconButton>
+        <Box sx={{ fontSize: 11, color: 'text.secondary', mt: 0.5 }}>Default</Box>
+      </Box>
+      <Box sx={{ textAlign: 'center' }}>
+        <IconButton disabled aria-label="Disabled">
+          <CloseIcon />
+        </IconButton>
+        <Box sx={{ fontSize: 11, color: 'text.secondary', mt: 0.5 }}>Disabled</Box>
+      </Box>
+    </Box>
+  ),
+};
+
+// ─── Common Use Cases ───────────────────────────────────────────────────────
+
+/** Real-world icon button patterns */
+export const CommonUseCases: Story = {
+  name: 'Common Use Cases',
+  render: () => (
+    <Box sx={{ display: 'flex', flexDirection: 'column', gap: 3 }}>
+      {/* Card actions toolbar */}
+      <Box>
+        <Box sx={{ fontSize: 12, color: 'text.secondary', mb: 1 }}>Card action toolbar</Box>
+        <Box sx={{ display: 'flex', gap: 1, p: 1, border: '1px solid', borderColor: 'divider', borderRadius: 1, width: 'fit-content' }}>
+          <IconButton size="small" color="primary" aria-label="Favourite">
+            <FavoriteBorderIcon />
+          </IconButton>
+          <IconButton size="small" color="primary" aria-label="Share">
+            <ShareOutlinedIcon />
+          </IconButton>
+          <IconButton size="small" aria-label="More options">
+            <MoreVertIcon />
+          </IconButton>
+        </Box>
+      </Box>
+
+      {/* Dialog close */}
+      <Box>
+        <Box sx={{ fontSize: 12, color: 'text.secondary', mb: 1 }}>Dialog close button</Box>
+        <Box sx={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', p: 2, border: '1px solid', borderColor: 'divider', borderRadius: 1, width: 300 }}>
+          <Box sx={{ fontWeight: 600 }}>Confirm Selection</Box>
+          <IconButton size="small" aria-label="Close dialog">
+            <CloseIcon />
+          </IconButton>
+        </Box>
+      </Box>
+
+      {/* Navigation header */}
+      <Box>
+        <Box sx={{ fontSize: 12, color: 'text.secondary', mb: 1 }}>Mobile navigation toggle</Box>
+        <Box sx={{ display: 'flex', alignItems: 'center', gap: 1, p: 1, backgroundColor: 'var(--fa-color-brand-50)', borderRadius: 1, width: 'fit-content' }}>
+          <IconButton size="large" aria-label="Open menu">
+            <MenuIcon />
+          </IconButton>
+          <Box sx={{ fontWeight: 600 }}>Funeral Arranger</Box>
+        </Box>
+      </Box>
+    </Box>
+  ),
+};

src/components/atoms/IconButton/IconButton.tsx

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+import React from 'react';
+import MuiIconButton from '@mui/material/IconButton';
+import type { IconButtonProps as MuiIconButtonProps } from '@mui/material/IconButton';
+
+// ─── Types ───────────────────────────────────────────────────────────────────
+
+/** Props for the FA IconButton component */
+export interface IconButtonProps extends MuiIconButtonProps {}
+
+// ─── Component ───────────────────────────────────────────────────────────────
+
+/**
+ * Icon-only button for the FA design system.
+ *
+ * Square button containing a single icon — used for close buttons, menu
+ * toggles, toolbar actions, and anywhere a text label would be redundant.
+ * Wraps MUI IconButton with FA brand tokens and consistent sizing.
+ *
+ * Sizes use the same height scale as Button:
+ * - `small` — 32px (compact toolbars, card actions)
+ * - `medium` — 40px (default, general actions)
+ * - `large` — 48px (mobile CTAs, meets 44px touch target)
+ *
+ * **Accessibility**: Always provide an `aria-label` prop. Icon-only
+ * buttons have no visible text, so screen readers rely entirely on
+ * the aria-label to announce the action.
+ * ```tsx
+ * <IconButton aria-label="Close dialog">
+ *   <CloseIcon />
+ * </IconButton>
+ * ```
+ */
+export const IconButton = React.forwardRef<HTMLButtonElement, IconButtonProps>(
+  (props, ref) => {
+    return <MuiIconButton ref={ref} {...props} />;
+  },
+);
+
+IconButton.displayName = 'IconButton';
+export default IconButton;

src/components/atoms/IconButton/index.ts

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+export { IconButton, default } from './IconButton';
+export type { IconButtonProps } from './IconButton';

src/components/atoms/Link/Link.stories.tsx

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+import type { Meta, StoryObj } from '@storybook/react';
+import { Link } from './Link';
+import Box from '@mui/material/Box';
+
+const meta: Meta<typeof Link> = {
+  title: 'Atoms/Link',
+  component: Link,
+  tags: ['autodocs'],
+  argTypes: {
+    underline: { control: 'select', options: ['none', 'hover', 'always'] },
+    color: { control: 'text' },
+  },
+};
+
+export default meta;
+type Story = StoryObj<typeof Link>;
+
+// ─── Default ────────────────────────────────────────────────────────────────
+
+export const Default: Story = {
+  args: {
+    href: '#',
+    children: 'Frequently Asked Questions',
+  },
+};
+
+// ─── Underline Variants ─────────────────────────────────────────────────────
+
+/** Three underline modes */
+export const UnderlineVariants: Story = {
+  name: 'Underline Variants',
+  render: () => (
+    <Box sx={{ display: 'flex', flexDirection: 'column', gap: 2 }}>
+      <Box sx={{ display: 'flex', alignItems: 'center', gap: 2 }}>
+        <Link href="#" underline="hover">Hover (default)</Link>
+        <Box sx={{ fontSize: 11, color: 'text.secondary' }}>underline="hover"</Box>
+      </Box>
+      <Box sx={{ display: 'flex', alignItems: 'center', gap: 2 }}>
+        <Link href="#" underline="always">Always underlined</Link>
+        <Box sx={{ fontSize: 11, color: 'text.secondary' }}>underline="always"</Box>
+      </Box>
+      <Box sx={{ display: 'flex', alignItems: 'center', gap: 2 }}>
+        <Link href="#" underline="none">No underline</Link>
+        <Box sx={{ fontSize: 11, color: 'text.secondary' }}>underline="none"</Box>
+      </Box>
+    </Box>
+  ),
+};
+
+// ─── Colour Variants ────────────────────────────────────────────────────────
+
+/** Brand (default) and secondary colour options */
+export const ColourVariants: Story = {
+  name: 'Colour Variants',
+  render: () => (
+    <Box sx={{ display: 'flex', flexDirection: 'column', gap: 2 }}>
+      <Box>
+        <Link href="#">Brand link (default — copper, 4.8:1 contrast)</Link>
+      </Box>
+      <Box>
+        <Link href="#" color="text.secondary">Secondary link (neutral grey)</Link>
+      </Box>
+      <Box>
+        <Link href="#" color="text.primary">Primary text link (charcoal)</Link>
+      </Box>
+      <Box>
+        <Link href="#" color="error.main">Error link (red — for destructive actions)</Link>
+      </Box>
+    </Box>
+  ),
+};
+
+// ─── Inline ─────────────────────────────────────────────────────────────────
+
+/** Links inline within body text */
+export const Inline: Story = {
+  render: () => (
+    <Box sx={{ maxWidth: 500, lineHeight: 1.7 }}>
+      If you need help planning a funeral, our{' '}
+      <Link href="#">arrangement guide</Link> walks you through each
+      step. You can also browse our{' '}
+      <Link href="#">provider directory</Link> to find local funeral
+      directors, or <Link href="#">contact us</Link> directly for
+      personalised assistance.
+    </Box>
+  ),
+};
+
+// ─── Navigation ─────────────────────────────────────────────────────────────
+
+/** Links styled for navigation (no underline) */
+export const Navigation: Story = {
+  render: () => (
+    <Box sx={{ display: 'flex', gap: 3 }}>
+      <Link href="#" underline="none" sx={{ fontWeight: 600 }}>FAQ</Link>
+      <Link href="#" underline="none" sx={{ fontWeight: 600 }}>Contact Us</Link>
+      <Link href="#" underline="none" sx={{ fontWeight: 600 }}>Log In</Link>
+    </Box>
+  ),
+};
+
+// ─── Footer ─────────────────────────────────────────────────────────────────
+
+/** Footer link pattern — secondary colour, smaller text */
+export const FooterLinks: Story = {
+  name: 'Footer Links',
+  render: () => (
+    <Box sx={{ display: 'flex', gap: 2, flexWrap: 'wrap' }}>
+      <Link href="#" color="text.secondary" variant="body2">Privacy Policy</Link>
+      <Link href="#" color="text.secondary" variant="body2">Terms of Service</Link>
+      <Link href="#" color="text.secondary" variant="body2">Accessibility</Link>
+      <Link href="#" color="text.secondary" variant="body2">Cookie Settings</Link>
+    </Box>
+  ),
+};
+
+// ─── On Different Backgrounds ───────────────────────────────────────────────
+
+/** Links on white vs warm vs grey surfaces */
+export const OnDifferentBackgrounds: Story = {
+  name: 'On Different Backgrounds',
+  render: () => (
+    <Box sx={{ display: 'flex', gap: 3 }}>
+      <Box sx={{ p: 3, backgroundColor: 'background.default', borderRadius: 1, border: '1px solid', borderColor: 'divider' }}>
+        <Box sx={{ fontSize: 11, color: 'text.secondary', mb: 1 }}>White</Box>
+        <Link href="#">Learn more</Link>
+      </Box>
+      <Box sx={{ p: 3, backgroundColor: 'var(--fa-color-surface-warm)', borderRadius: 1 }}>
+        <Box sx={{ fontSize: 11, color: 'text.secondary', mb: 1 }}>Warm (brand.50)</Box>
+        <Link href="#">Learn more</Link>
+      </Box>
+      <Box sx={{ p: 3, backgroundColor: 'var(--fa-color-surface-subtle)', borderRadius: 1 }}>
+        <Box sx={{ fontSize: 11, color: 'text.secondary', mb: 1 }}>Grey (neutral.50)</Box>
+        <Link href="#">Learn more</Link>
+      </Box>
+    </Box>
+  ),
+};

src/components/atoms/Link/Link.tsx

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+import React from 'react';
+import MuiLink from '@mui/material/Link';
+import type { LinkProps as MuiLinkProps } from '@mui/material/Link';
+
+// ─── Types ───────────────────────────────────────────────────────────────────
+
+/** Props for the FA Link component */
+export interface LinkProps extends MuiLinkProps {}
+
+// ─── Component ───────────────────────────────────────────────────────────────
+
+/**
+ * Navigation text link for the FA design system.
+ *
+ * Inline or standalone text link with FA brand styling — copper colour
+ * (brand.600) for WCAG AA compliance on white backgrounds. Underline
+ * appears on hover by default.
+ *
+ * Wraps MUI Link with FA theme tokens. Uses `color.text.brand`
+ * (#B0610F, 4.8:1 contrast ratio on white).
+ *
+ * Usage:
+ * ```tsx
+ * <Link href="/faq">Frequently Asked Questions</Link>
+ * <Link href="/contact" color="text.secondary">Contact Us</Link>
+ * ```
+ *
+ * For button-styled links, use `Button` with `component="a"` and `href`.
+ * For navigation menu items, use Link with `underline="none"`.
+ */
+export const Link = React.forwardRef<HTMLAnchorElement, LinkProps>(
+  (props, ref) => {
+    return <MuiLink ref={ref} {...props} />;
+  },
+);
+
+Link.displayName = 'Link';
+export default Link;

src/components/atoms/Link/index.ts

@@ -0,0 +1,2 @@
+export { Link, default } from './Link';
+export type { LinkProps } from './Link';