feat: use battery saving sync intervals

[ovitrif]

This PR:
2. Adds battery saving sync intervals when the app goes to the background

Description

When the app is backgrounded, the Lightning node now switches to battery-saving sync intervals using the new RuntimeSyncIntervals API from ldk-node. When the app returns to the foreground, normal sync intervals are restored. This reduces battery drain while keeping the node active for receiving payments.

The SDK update also adds a new claimableOnCloseSats property to channel details, which is now included in mock data and extensions.

Preview

N/a - No UI changes.

QA Notes

1. Test background behavior

   • Open the app and wait for the node to start
   • Background the app by pressing the home button
   • Check logcat for: Sync intervals entered battery saving mode
   • Foreground the app
   • Check logcat for: Sync intervals exited battery saving mode

2. Test normal operation

   • Verify payments can still be sent and received
   • Verify wallet balance updates correctly
   • Verify channel information displays properly

[jvsena42]

IMHO we could delay this feature to the next week, after Plan B, to avoid unforeseen bugs such as those caused by graph caching

[ovitrif]

Drafted for this:

IMHO we could delay this feature to the next week, after Plan B, to avoid unforeseen bugs such as those caused by graph caching

And also for the fact that it doesn't even work yet the way it's supposed to work.

[jvsena42]

Drafted for this:

IMHO we could delay this feature to the next week, after Plan B, to avoid unforeseen bugs such as those caused by graph caching

And also for the fact that it doesn't even work yet the way it's supposed to work.

Indeed, I wasn't getting the expected logs