[DO NOT MERGE] Update contextual cards display mechanism

1. Make Wi-Fi card default to collapse.
2. Support showing a default card when there's no displayable card.
3. Solve the problem of icon not showing for cached slices in card
renderer

Bug: 163288869
Fixes: 159092915
Test: manual, robotest
Change-Id: Ie8b61ad58410337334e29b7a794353b0c6a6ba8c