* fix: rendering error for mermaid flowchart syntax
* feat: add submit button ref and enable submit on Ctrl+Enter in EditMessage component
* feat: add save button and keyboard shortcuts for saving and canceling in EditMessage component
* feat: collapse chat on max height
* refactor: implement scrollable detection for textarea on key down events and initial render
* feat: add regenerate button for error handling in HoverButtons, closes#3658
* feat: add functionality to edit latest user message with the up arrow key when the input is empty
