Dev

[isaaclins]

This pull request introduces a comprehensive automatic update system to the Psst application, including user-facing features, configuration options, and supporting backend logic. It adds a new Updates tab to Preferences, background update checking, manual update controls, and platform-specific installation flows. The changes also update documentation to describe the new system and its usage.

User-facing features and documentation:

• Added a new Updates tab to Preferences, allowing users to view available updates, manually check for updates, disable automatic checking, and dismiss specific versions. [1] [2]
• Updated README.md to document the automatic update feature and link to detailed instructions in docs/UPDATES.md. [1] [2]

Backend and configuration support:

• Introduced new data types (UpdateInfo, UpdatePreferences, etc.) and selectors to support update checking, installation, and status reporting in the application state. [1] [2] [3] [4] [5] [6]
• Added logic to check for updates on startup if enabled in user preferences.

Application delegate and event handling:

• Implemented background threads for update checking and installation, with status updates and error handling integrated into the app's main event loop. [1] [2]

These changes collectively provide a robust, user-friendly update experience and lay the foundation for future enhancements.