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Brief utility module providing responsive visibility helpers for table columns based on Tailwind CSS breakpoints. Both exports are deprecated in favor of `data-table`.

## Key Components

- **`getHideClasses(hideAt?)`** — Generates Tailwind CSS utility classes to hide/show an element at specified breakpoints. Supports single or multiple breakpoints and computes the appropriate `hidden`/`flex` class combinations.
- **`isHiddenOnMobile(column)`** — Returns `true` if a `TableColumn` is configured to hide at the `md` breakpoint (i.e., hidden on mobile).

## Usage Example

```typescript
import { getHideClasses, isHiddenOnMobile } from './utils'

// Single breakpoint: hide below md, show at md and above
getHideClasses('md')
// → 'hidden md:flex'

// Multiple breakpoints: hide at md and lg, show at xl
getHideClasses(['md', 'lg'])
// → 'md:hidden lg:hidden xl:flex'

// Hide at 2xl with no larger breakpoint — just hide
getHideClasses('2xl')
// → '2xl:hidden'

// Check if a column is hidden on mobile
const column = { key: 'email', hideAt: 'md' }
isHiddenOnMobile(column)
// → true
```

> **Deprecated:** Both `getHideClasses` and `isHiddenOnMobile` are deprecated. Use the `data-table` component instead.