Enable “Incognito” options

[Raposoraptor]

One of the browser extensions I’ve used the most with WhatsApp Web is WAIncognito, as I find its features very useful. I propose adding these features to ZapFast. I’ve attached screenshots showing all the features offered by this extension.

[https://chromewebstore.google.com/detail/alhmbbnlcggfcjjfihglopfopcbigmil]

[github-actions[bot]]

Duplicate of #718. This requests the same per-chat incognito behavior as #718, including suppressing read receipts while viewing, keeping chats unread, and providing an explicit mark-as-read action. Please follow that issue for the shared feature request.

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