Some small bug fixes and improvements, including more preparations for mobile.
- Add "enter" keyboard shortcut as confirmation key for dialogs.
- On mobile, also provide loading indicator for content view in header bar.
- Add more space on right of bullet for task items to prevent accidental task completion on mobile.
- Changed log out dialog confirmation button text to fit on smaller mobile screens.
- Selecting items by using up/down keyboard arrow keys (when no previous items selected) now also shows the "Done" button.
- Esc key should also close Keyboard Shortcuts modal, if it's open.
- Don't deactivate item if indented via the task bar.
- Fixed header "more" button alignment on both mobile and desktop widths.