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Computes a pre-blended background tint by mixing a given hex color at 10% opacity over a fixed dark background (`#161616`), returning the resulting opaque hex color.

## Key Components

- **`tintOnDark(hex: string): string`** — Takes a hex color string (e.g. `#FFC008`), blends it at 10% over `#161616`, and returns the resulting opaque hex color.

## Usage Example

```typescript
import { tintOnDark } from './color-utils'

const tinted = tintOnDark('#FFC008')
// Returns the pre-blended hex, e.g. "#211e13"
// Useful for subtle colored backgrounds on dark UIs

const redTint = tintOnDark('#FF0000')
// Blends red at 10% over #161616 → "#281616"
```

## Notes

- The background is hardcoded to `#161616` (decimal `22`), matching Flamingo's dark theme base.
- Blend formula per channel: `round(0.1 * foreground + 0.9 * 22)`
- Input hex may include or omit the leading `#`.
- Returns a fully opaque hex string — no alpha channel — making it safe for any CSS `background-color` context.