Fix possible race in user creation

This issue showed up a lot in CI where things are a lot slower. The
createprofile fragment spawns a coroutine that will create a user and
returns before it's done, then the contactlist fragment will try to load
the user, leading to a crash if the user-creation coroutine hasn't done
its thing yet.

With this change, we wait for the user-creation coroutine to complete
before moving to the contactlist fragment.

To reproduce the issue locally, I added a delay(1000) in
UserManager::create.

Author: robinlinden

atox/src/main/kotlin/ui/createprofile/CreateProfileFragment.kt

@@ -1,4 +1,5 @@
-// SPDX-FileCopyrightText: 2020-2021 aTox contributors
+// SPDX-FileCopyrightText: 2019-2025 Robin Lindén <[email protected]>
+// SPDX-FileCopyrightText: 2022 aTox contributors
 //
 // SPDX-License-Identifier: GPL-3.0-only
 
@@ -19,6 +20,7 @@ import androidx.core.view.WindowInsetsCompat
 import androidx.core.view.updatePadding
 import androidx.fragment.app.viewModels
 import androidx.navigation.fragment.findNavController
+import kotlinx.coroutines.runBlocking
 import ltd.evilcorp.atox.R
 import ltd.evilcorp.atox.databinding.FragmentProfileBinding
 import ltd.evilcorp.atox.ui.BaseFragment
@@ -95,7 +97,10 @@ class CreateProfileFragment : BaseFragment<FragmentProfileBinding>(FragmentProfi
                 name = if (username.text.isNotEmpty()) username.text.toString() else getString(R.string.name_default),
                 statusMessage = getString(R.string.status_message_default),
             )
-            viewModel.create(user)
+
+            runBlocking {
+                viewModel.create(user).join()
+            }
 
             findNavController().popBackStack()
         }