Update Smartspace media recommendation card appearance to match the latest mock.

A contextual card header is added, and also the expanded version of recommendation card.

Screenshots:
[Compact]
- http://screen/U3SPZQHPYLyoU4t
- http://screen/8ccMqUqUmBQUvmd
[Expanded]
- http://screen/9ASnXWGHWoyph2B
- http://screen/A6hzbLDjpfsjVkA

Demo: https://drive.google.com/file/d/1iRZBhC81q-HflRQDUgzMbNeBagkAo9aS/view?usp=sharing

Fixes: 186165627
Test: Studio builds
Change-Id: Ib7f65bdcbe7ede1901c7969d04f3efbbc7c2461d