Mark an inbox item as read — radicle-desktop

Add ‘Read/unread` property to inbox items to help see what you already looked at. Visiting an item from the inbox should automatically mark it as read.

@_sebastinez|588287 said:

So I implemented a new tauri command to mark inbox items as read or unread, according to issue `f50502b`, this generated a few issues..

1. How do read notification teasers look like? A bit more greyed out? Should they be put in a separate read section?
2. Each notification teaser is a collection of multiple notifications, do we mark all of them as read each time? Should we somehow allow users to mark individual actions as read?

2.1. How should we handle notification teasers that have mixed read statuses?
Context: from `rad inbox` there is the ability to mark inbox items as read per `rowId` they have in the database.
e.g. if a user marks row 1 as read, and in the desktop app we group 1,2 and 3 we don't have a defined state for that teaser since 1 of those notifications is read but the others don't..