Fix HTML markup in header.jsp.
Fix up HTML in simulator.jsp and sprinkler.jsp.
Remove redundant setting of uname as a request variable in LoginServlet.
Store the sprinkler settings in the JSP session.
Update the settings UI based on JSP session values.
Track security breach status in the JSP session.
Add a confirmation dialog when the security alarm state in the session
is off and the user is attempting to update the alarm state to on.
Implement the security alarm countdown functionality.