fix(mobile-next): 按 B-91 收口 Android 通话视觉打回项

呼出/通话中按钮、计时器、底色、60s 未接与进出场动效对齐视觉规范。

Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: multica-agent <github@multica.ai>

mobile-next/test/company/call_session_guard_test.dart

@@ -9,6 +9,11 @@ void main() {
     expect(LiveKitCallConfig.enabled, LiveKitCallConfig.shipped);
   });
 
+  test('默认未接超时是 60 秒', () {
+    expect(LiveKitCallConfig.inviteTimeout, const Duration(seconds: 60));
+    expect(CallSessionGuard().inviteTimeout, LiveKitCallConfig.inviteTimeout);
+  });
+
   test('占线时拒绝第二路呼出/呼入', () {
     final guard = CallSessionGuard();
     expect(guard.startOutgoing('room-a'), isNull);