fix: change send button selector to a specific class instead of generic <button>#138

gadenbuie merged 6 commits intoposit-dev:mainposit-dev/shinychat:mainfrom

DeepanshKhurana:fix/137-specific-send-button-selectorDeepanshKhurana/shinychat:fix/137-specific-send-button-selectorCopy head branch name to clipboard