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Defines and exports the single source of truth for the `seo_description` field length constraint, enforcing a hard database-level character cap.

## Key Components

| Export | Type | Value | Description |
|--------|------|-------|-------------|
| `SEO_DESCRIPTION_MAX_LENGTH` | `number` | `160` | Hard cap matching the `varchar(160)` DB column constraint |

## Usage Example

```typescript
import { SEO_DESCRIPTION_MAX_LENGTH } from '@flamingo-stack/openframe-frontend-core/utils';

// UI input enforcement
<input maxLength={SEO_DESCRIPTION_MAX_LENGTH} />

// AI prompt guidance
const prompt = `Generate a description under ${SEO_DESCRIPTION_MAX_LENGTH} characters.`;

// Validation guard
if (description.length > SEO_DESCRIPTION_MAX_LENGTH) {
  throw new Error(`SEO description exceeds ${SEO_DESCRIPTION_MAX_LENGTH} character limit.`);
}
```

## Notes

> **Hard cap** — unlike `seo_title` (a soft search-engine recommendation), this limit is enforced at the database level (`varchar(160)`). Postgres will reject values exceeding it outright.

**Known consumers:**
- `SEOEditorPreview` — binds `maxLength` and renders an over-length alert
- The hub — uses this constant for AI generation prompt guidance and the rewrite-to-fit helper

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**Source:** [`seo-description.ts`](https://github.com/flamingo-stack/openframe-oss-lib/blob/main/seo-description.ts)