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Resolves `target` and `rel` anchor attributes for entity cards by delegating the same-tab vs. new-tab decision to the `ChatRuntime` navigation callback, eliminating the need for hub-side wrapper components.

## Key Components

### `useEntityCardLink(args): EntityCardLinkProps`

Primary hook that computes anchor link attributes using a two-priority resolution strategy:

1. **Explicit override** — If `target` or `rel` props are passed directly, they win immediately. A missing `rel` is auto-paired with `'noopener noreferrer'` when `target='_blank'` to prevent tabnabbing.
2. **Runtime decision** — Falls back to `computeIsNewTab(runtime, href, targetPlatform)`, which mirrors the click handler in `executeNavigation`, keeping the rendered anchor and the click behavior in sync. Returns `{ target: undefined, rel: undefined }` (same-tab) when no runtime is mounted.

### Interfaces

| Interface | Purpose |
|---|---|
| `UseEntityCardLinkArgs` | Input: `href`, optional `targetPlatform`, optional explicit `target`/`rel` overrides |
| `EntityCardLinkProps` | Output: resolved `target` and `rel` values for spreading onto an anchor element |

## Usage Example

```typescript
import { useEntityCardLink } from './use-entity-card-link'

function BlogCard({ href, targetPlatform }: Props) {
  const { target, rel } = useEntityCardLink({ href, targetPlatform })

  return (
    <a href={href} target={target} rel={rel}>
      Read Post
    </a>
  )
}

// Explicit override — runtime decision skipped entirely
function ExternalCard({ href }: Props) {
  const { target, rel } = useEntityCardLink({
    href,
    target: '_blank',
    // rel auto-paired to 'noopener noreferrer'
  })

  return <a href={href} target={target} rel={rel}>Open</a>
}
```

## Notes

- Requires `HubRuntimeProvider` (or a compatible embed shim) to be mounted for runtime-derived decisions.
- Result is memoized on `[target, rel, href, targetPlatform, runtime]` — safe to call in render.
- Source: [`use-entity-card-link.ts`](https://github.com/flamingo-stack/openframe-oss-lib/blob/main/use-entity-card-link.ts)