* add activityCenter.ts
* use `process.env.VITEST`
* add `isMention` and `isReply`
* use activityCenter.ts
* fix initial `count`
* add `Badge` component
* add "Launch via Vite Node"
* remove comments
* remove `console.log`
* add comments
* type hook
* reverse order of notifications
* remove `activityCenter` from `provider.tsx`
* set `count`'s default value
* ref `ChatMessage` by id instead of object reference
* Revert "ref `ChatMessage` by id instead of object reference"
This reverts commit 1284386d22.
* use `isAuthor`