fix: session status stuck on Connection in progress on devices without GMS

[SERDUN]

Problem

On devices without Google Mobile Services (e.g. Huawei MAO-LX9N Android 12), the app shows "Connection in progress" permanently, even though the signaling connection and SIP registration complete successfully.

Root cause (two-part):

1. PushTokensBloc never emits after initialization on no-GMS devices — _retrieveAndStoreFcmToken checks GMS availability, gets a terminal status, and returns early without any emit() or add().

2. SessionStatusCubit constructor called _emitCombinedStatus(pushTokensBloc.state, callBloc.state) passing initial states as parameters, but never stored them in _lastPushTokensState / _lastCallState. All subsequent calls from _onCallChanged used _lastPushTokensState = null, so the condition pushTokens != null && call != null was always false — the UI status was never updated from its initial SessionStatus.inProgress.

On GMS devices this goes unnoticed because PushTokensBloc emits when the FCM token arrives, which triggers _onPushTokensChanged, seeds _lastPushTokensState, and unblocks future _onCallChanged emissions.

Fix

Seed _lastPushTokensState and _lastCallState directly from the blocs' current states in the constructor, before subscribing to their streams.

_lastPushTokensState = pushTokensBloc.state;
_lastCallState = callBloc.state;

This way, even if PushTokensBloc never emits (no GMS), _onCallChanged can still update the UI status correctly.

Affected devices

Reproduces on any Android device without Google Play Services where PushTokensBloc stays in its initial state (pushToken: null, errorMessage: null).

Confirmed via logcat: HUAWEI-MAO-LX9N-Android-12_2026-04-10_120728.logcat — signaling reaches registered at 12:07:02 but _lastPushTokensState is null throughout the entire session.

[SERDUN]

Addressed: removed the unused optional parameters initialPushTokens / initialCall from _emitCombinedStatus and simplified the method body to read directly from _lastPushTokensState / _lastCallState.