BUG: 357996
- Action visibility improvement because some actions not needed in specific modes
- Enter new puzzle: 'Hint' and 'Solve' not visible
- Play puzzle: 'Check' not visible
- Start page: 'Hint', 'Solve' and 'Check' not visible
- For Bug 357996
- Disable Hint and Solve action after puzzle was solved
- NOTE that currently, those buttons won't get enabled when the user triggers the undo action