Function fadeOut

fadeOut(element: HTMLElement, options?: FadeOptions): Promise<void>
Fades out an element by animating its opacity from 1 to 0.

Uses CSS transitions for smooth animation. The returned promise can be cancelled to immediately hide the element.
Parameters
- element: HTMLElement
  The DOM element to fade out
- Optionaloptions: FadeOptions = {}
  Fade options
  
  Options for configuring fade effects.
  
  FadeOptions
  - Optionalduration?: number
    Animation duration in milliseconds.
  - OptionalonComplete?: () => void
    Callback function invoked when the animation completes (either naturally or when cancelled).
Returns Promise<void>
A cancellable promise that resolves when animation completes. Call .cancel() to immediately hide the element.
Example
```
const element = document.getElementById("character");
const animation = fadeOut(element, { duration: 300 });

// Optionally cancel to hide immediately
animation.cancel();
```
- Defined in src/renderer/effects.ts:175