Update player background and add volume button

[ashiagr]

Description

This PR updates the Wear app's "Now Playing" screen to include

• background based on the currently playing podcast
• volume/source options

Testing Instructions

• Play an episode from any podcast
• Navigate to the player screen in the pager
• ✅ Notice that the background has a tint based on the currently playing podcast
• Notice that there is a volume button at the bottom
• Tap on the volume button
• ✅ Notice that the volume screen opens with a volume stepper and there's an option to select the volume source
• Select a volume source
• Control volume using the volume stepper
• ✅ Notice that the volume changes for the selected source

ℹ️ The PR uses the horologist-provided volume screen, the screen needs to be updated based on Figma design.

Screenshots or Screencast

volume_.mp4

Checklist

• If this is a user-facing change, I have added an entry in CHANGELOG.md
• I have considered whether it makes sense to add tests for my changes
• All strings that need to be localized are in modules/services/localization/src/main/res/values/strings.xml
• Any jetpack compose components I added or changed are covered by compose previews

I have tested any UI changes...

• with different themes
• with a landscape orientation
• with the device set to have a large display and font size
• for accessibility with TalkBack

[mchowning]

This looks good! Great work!