Performance:

• Optimized search regex compilation in category and label pickers. (#2715)
• Improved sync engine performance by reducing unnecessary SQLite writes and moving parsing outside transactions. Bug Fixes:
• Improved theme support in calendar
• Fixed dark mode email bodies not reflecting the system tint color.
• Fixed activeMarks access errors in the composer editor. (#2714)
• Fixed thread list scroll indicator not sliding through time when dragging the scroll handle. (#2716)
• Fixed contains error when parentFilter receives a non-Element node. (#2712)
• Fixed secrets potentially appearing in the connection error detail modal. (#2717)
• Fixed package name validation rejecting names with uppercase letters. (#2718)
• Fixed sync engine crash during many-account sync by increasing SQLite busy timeout.
• Fixed message importance headers not normalized for compatibility with some providers. (mailsync#113)
• Improved error logging for empty or malformed error objects. (#2713) Developer:
• Upgraded Electron from 41.5.0 to 41.6.1.
• Upgraded React and React DOM to v17. (#2725)
• Upgraded react-transition-group from 1.2 to 4.4.5.
• Replaced deprecated componentWillMount with componentDidMount. (#2724)
• Replaced legacy context API with React Context. (#2722, #2723)
• Refactored class components to functional components with React.memo. (#2720)
• Removed PropTypes, replaced with TypeScript types. (#2710)
• Added missing TypeScript types to function declarations across many files.
• Renamed remaining package spec directories to specs, converted JSX to TSX. (#2711)
• Added Playwright tests for composer interactions.
• Fixed lint CI step that was performing fixes instead of validation. (#2719)
• Removed unused CircleCI configuration.
• Set C++ standard to C++17 across all platforms. (mailsync#114)
• Various CMake and build improvements for mailsync. (mailsync#108, mailsync#109, mailsync#110, mailsync#111, mailsync#112) Thanks @LinusDierheimer!