Implement new design of Wi-Fi card

- always show Wi-Fi card
- collapse the card in the new UI session when connecting to a stable
  network
- hide toggle, show a level icon and subtext in the new collapsed mode
- show loading row when the AP list is not full

Test: robotest
Fixes: 147473096
Change-Id: I893064ef04d40d8e7cb8e62c1e72a2cb5e97f6ac