Force last owner of a room to pass ownership when leaving (#5094)

* Move `ChangeRoles*` classes to their own module so they can be shared

* Hook the change roles screen to the leave room action, add confirmation dialogs

* Use enum instead of sealed interface for `ChangeRoomMemberRolesListType`

* Try to improve communications between nodes

* refactor (leave room) : makes sure to expose only necessary code from api module

* Add `:libraries:previewutils` module to share some test fixtures used for UI previews

* Update screenshots

---------

Co-authored-by: ElementBot <android@element.io>
Co-authored-by: ganfra <francoisg@matrix.org>

libraries/architecture/src/main/kotlin/io/element/android/libraries/architecture/appyx/NodeExt.kt

@@ -0,0 +1,34 @@
+/*
+ * Copyright 2025 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+@file:OptIn(InternalComposeApi::class)
+
+package io.element.android.libraries.architecture.appyx
+
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.InternalComposeApi
+import androidx.compose.runtime.currentComposer
+import androidx.lifecycle.compose.LocalLifecycleOwner
+import androidx.lifecycle.lifecycleScope
+import app.cash.molecule.AndroidUiDispatcher
+import app.cash.molecule.RecompositionMode
+import app.cash.molecule.launchMolecule
+import com.bumble.appyx.core.node.Node
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.flow.StateFlow
+
+fun <State> Node.launchMolecule(body: @Composable () -> State): StateFlow<State> {
+    val scope = CoroutineScope(lifecycleScope.coroutineContext + AndroidUiDispatcher.Main)
+    return scope.launchMolecule(mode = RecompositionMode.ContextClock) {
+        currentComposer.startProviders(
+            values = arrayOf(LocalLifecycleOwner provides this),
+        )
+        val state = body()
+        currentComposer.endProviders()
+        state
+    }
+}