Display flash messages in the timer dialog

[potomak]

Version 0.13.2 introduced a white overlay that hides the section where flash messages appear, making it less clear that a new tomato has been created.

The suggested solution is to add a section in the timer dialog window where we display these messages.

[morrme]

I would like to try to help with this, if you're able to help.

[potomak]

@morrme I'm sorry, but this PR needs a relatively deep knowledge of both Rails and the application, that's why I didn't tag it as "help needed".