**StatusDot** — tiny colored dot for channel/transcode state. `live` pulses in accent (on-air), the rest are static status colors.

```jsx
<StatusDot status="live" label="On air" />
<StatusDot status="ok" label="Idle" />
<StatusDot status="error" label="Failed" />
```

Props: `status` (live·ok·warn·error·idle), `pulse`, `size`, `label`.
