Persistent custom Gotify notifications in GNOME
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1. Also null out in disable: ```js this._notificationManager = null; ``` [EGO Review Guidelines: Destroy](https://gjs.guide/extensions/review-guidelines/review-guidelines.html#destroy-all-objects) 2. Timeout should be removed on destroy (line 102 `extension.js`): [EGO Review Guidelines: Timeout](https://gjs.guide/extensions/review-guidelines/review-guidelines.html#remove-main-loop-sources)