Update overview actions alignment

- Align overview actions to the top with a defined margin below task thumbnail, except for vertical bar layout
- In modal state, use task view's bottom as pivot, and expand using all the space about pivot
- Simplified overview actions margin calculation and moved some logic to DeviceProfile

Bug: 209981696
Test: manual on various devices
Change-Id: I4c96cb02c6f3d6adf30633ddeb883bc4eec16f36