Proton Mail: Correo cifrado

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- Introduced the "Mark read" quick notification action
- Fixed an issue where moving messages individually would not update the conversation labels immediately
- Fixed an issue where messages would reappear in the mailbox after trashing them
- Fixed an issue where Reply/All actions would not remove duplicate recipients
- Fixed an issue where opening a message from the Sent would not expand the corresponding message in the conversation details
- Minor other fixes and improvements