Only have TimeLeft render the actual progress bar.
Wire the QuitGameModal to the backend.
Listen for state update in GameToolbar to properly quit the current game.
Let user abort a game by clicking "Quit Game". Close #12.
Fix a few bugs in QuestionModal.
Disallow closing the Question modal before answering all the questions.

See #13.
Fix missing key.
Tile.won => Tile.wonBy.
Disable link on disabled tiles.
Render question modal fullscreen.

See #13.
Show close button on time up.