Worked on enhancing the user interface of Telegram Desktop by implementing an expandable quote button within the caption field, directly addressing a missing feature highlighted in GitHub Issue #29530. This update improved the caption composition experience and streamlined the quoting workflow, reducing user friction and aligning with product usability goals. The work involved focused UI design and front end development, utilizing CSS to update the styling and interaction logic. All changes were contributed to the telegramdesktop/tdesktop repository, with a clear, traceable commit that facilitates future maintenance. The solution demonstrates attention to user experience and maintainability within a Qt-based desktop environment.