IdleService read the account list once at startup, so a removed account's IDLE
loop kept reconnecting (backing off harmlessly) until the service restarted, and a
newly-added account wasn't watched until then either.
- IdleService now observes the accounts and reconciles one IDLE watcher per account:
it starts a watcher for an added account and cancels the watcher for a removed one,
which closes that account's IDLE connection promptly via the existing cancellation
path.
- The app runs the service only while push is enabled AND at least one account exists,
so it auto-starts on the first account and stops on the last.
- Verified on the Android 17 emulator: two accounts held two IDLE connections; removing
one dropped to a single connection with no retry loop, and the other kept idling.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
JMR-devandClaude Opus 4.8
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