browser (chat): message edition + extra menu: - handle extra menu - implement `quote` action - last message correction - show popup with last editions history when "editer" pencil icon is hovered - up arrow let quickly edit last message - implement input modes, `normal` being the default, `edit` or `quote` are new ones. - [ESC] erase input and returns to `normal` mode - fix size and set focus on message input when page is loaded - fix identity retrieval on new messages