Android: Agent Activity home screen widget

[Garberchov]

Problem

On Android there is no home screen widget for agent activity. iOS has the Agent Activity widget, but app.config.ts registers it with android: null, so the Android widget picker only offers Subscription usage. To see whether an agent is working or needs you, you have to open the app or find the ongoing notification.

Proposal

Ship the existing Agent Activity widget on Android, with the same layout, data, and wording as iOS:

• A summary line ("1 needs attention", "3 active", "Done"), then up to four threads with their status, ordered so the thread that needs you comes first.
• Tapping it opens the first thread.
• Same freshness as iOS: it refreshes when the app opens, and running rows switch to "Out of date" after 10 minutes. Android has no widget timelines, so an alarm triggers that switch.

It reuses the relay snapshot and the T3WidgetExpiry module that the Android Subscription usage widget already uses. It adds no new server work.

Working version

#35965 implements this. I ran it on an Android 16 emulator signed in to T3 Connect with live agents:

If this direction works for the team, the PR is ready for review. If you'd rather build it yourselves, it can be closed.