QS UI A11y Colors and polish

Updated colors and focus ring related UI to match specs:
- Feature Tile drill-in button background and icon colors
- Channel indicator focus ring color
- Feature Tile focus ring padding
- Feature tile drill-in button in dark mode has a different focus ring
color when the button is toggled
- Change `ui::kColorAshFocusRing` to `cros_tokens::kCrosSysFocusRing`
- Add insets on BatteryLabelView so focus ring doesn't overlap

video: https://drive.google.com/file/d/1R-cs1IBePqa6j3eIrWv1bPFwr5QfY0FJ/view?usp=share_link&resourcekey=0-a3W7yCuy-sKT3CTU70El6g

Change-Id: I325345d0b97e729069c5ddeb4d2010de65578f0f
Bug: b:266010036
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4326970


Commit-Queue: Kevin Radtke <kradtke@chromium.org>
Reviewed-by: Sean Kau <skau@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1118871}