Implement persistent foreground service to keep calls active in background, with notification controls for managing the call #5660
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This PR is in response to Issue #1688 . In summary, if PIP is not available, the call ends and this should not happen. I used ChatGPT Codex, Claude, and localAI via Qwen3-coder to generate the code in this PR. Within my personal programming abilities, I still believe the code is elegant. I've used the test app for several calls with no issues on a P6P with latest android.
This PR implements two key functions:
a. Allows users to return to the call
b. Allows users to end an active call directly from the persistent notification without needing to return to the CallActivity
Features
The implementation follows Android best practices:
🏁 Checklist
/backport to stable-xx.x