Proton Mail: Encrypted Email

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- Introduced the "Post subscription" flow
- Introduced "double tap to select text" support in Composer
- General performance improvements across the application: faster navigation, smoother scrolling, and a ~20% reduction in app size
- Fixed an issue where the Mailbox list would display empty rows under certain conditions
- Fixed an issue where "Open in Proton Calendar" would not open the Calendar app under certain conditions
- Fixed an issue where some attachments could not be opened