Add documentation for Link component in POS UI Extensions

- Add Link to StandardComponents union type
- Create Link.doc.ts with comprehensive documentation including:
  - Component description highlighting tappable text interactions
  - Command system support (--show, --hide, --toggle, --copy)
  - Best practices for accessibility and onClick handlers
  - Clear distinction between Link and Button usage
- Add default.html example demonstrating basic Link usage
- Add placeholder screenshot images (link-thumbnail.png, link-default.png)

Author: armaan-ghosh

packages/ui-extensions/docs/surfaces/point-of-sale/screenshots/link-default.png

@@ -0,0 +1,53 @@
+import {ReferenceEntityTemplateSchema} from '@shopify/generate-docs';
+
+const data: ReferenceEntityTemplateSchema = {
+  name: 'Link',
+  description:
+    'The `Link` component makes text interactive, allowing users to trigger actions through tappable text. Use it for lightweight interactions, navigation triggers, or actions embedded within text content.' +
+    '\n\nLinks support the command system for controlling other components declaratively. Use `command` and `commandFor` to show, hide, or toggle modals and other targetable elements. For primary actions like submitting forms or triggering operations, use [`Button`](/docs/api/pos-ui-extensions/2026-01-rc/polaris-web-components/actions/button) instead.',
+  thumbnail: 'link-thumbnail.png',
+  isVisualComponent: true,
+  type: '',
+  definitions: [
+    {
+      title: 'Properties',
+      description:
+        'Configure the following properties on the `Link` component.',
+      type: 'Link',
+    },
+  ],
+  category: 'Polaris web components',
+  subCategory: 'Actions',
+  defaultExample: {
+    image: 'link-default.png',
+    description:
+      'Create interactive links using the `Link` component. This example demonstrates basic link usage with onClick handlers for custom actions.',
+    codeblock: {
+      title: 'Create an interactive link',
+      tabs: [
+        {
+          code: './examples/default.html',
+          language: 'html',
+        },
+      ],
+    },
+  },
+  subSections: [
+    {
+      type: 'Generic',
+      anchorLink: 'best-practices',
+      title: 'Best practices',
+      sectionContent: `
+- **Write clear, descriptive text:** Link text should clearly indicate the action or destination, helping users understand what will happen when they tap.
+- **Keep text concise:** Use brief, actionable language that doesn't clutter the interface. Links work well embedded within text content.
+- **Provide accessibility labels when needed:** Use \`accessibilityLabel\` when the visible text doesn't fully describe the action, especially for short labels like "Edit" or "View".
+- **Use the command system for component control:** Use \`command\` (\`--show\`, \`--hide\`, \`--toggle\`, \`--copy\`) with \`commandFor\` to control modals and other components declaratively.
+- **Handle onClick for custom logic:** Implement \`onClick\` handlers for actions like showing toasts, updating state, or triggering side effects.
+- **Reserve buttons for primary actions:** Use \`Button\` for prominent actions like "Save" or "Submit". Use \`Link\` for secondary, embedded, or text-based interactions.
+`,
+    },
+  ],
+  related: [],
+};
+
+export default data;

packages/ui-extensions/docs/surfaces/point-of-sale/screenshots/link-thumbnail.png

@@ -0,0 +1 @@
+<s-link>Tappable link</s-link>

packages/ui-extensions/src/surfaces/point-of-sale/components/Link/Link.doc.ts

@@ -15,6 +15,7 @@ export type StandardComponents =
   | 'Heading'
   | 'Icon'
   | 'Image'
+  | 'Link'
   | 'Modal'
   | 'NumberField'
   | 'Page'