Let the user switch account from the room select screen when sharing

When several accounts are signed in, sharing into the app no longer goes through the account selection screen. The room select screen (Share mode) now displays the selected account and an account switch on top of the room list, with a design similar to the multi account section of the settings.

Selecting another account displays the rooms of this account in place, scrolled to the top, without recreating the screen. The content is then shared from the room select screen using the selected account, with the same progress and error dialogs as when sharing with the current account. The current account is switched only once the share has succeeded, then the room is opened if the content has been shared to a single room.

Implementation:
- RoomSelectNode is now in the AppScope and uses MatrixClientProvider to get the room list of the selected session.
- ShareNode gets the SharePresenter of the selected session from its session graph, using the new ShareBindings.
- SessionGraphFactory is moved to the matrix api module so that it can be used by features.

The account selection screen is still used for permalinks.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

features/forward/impl/src/main/kotlin/io/element/android/features/forward/impl/ForwardMessagesNode.kt

@@ -28,6 +28,7 @@ import io.element.android.libraries.architecture.inputs
 import io.element.android.libraries.di.SessionScope
 import io.element.android.libraries.matrix.api.core.EventId
 import io.element.android.libraries.matrix.api.core.RoomId
+import io.element.android.libraries.matrix.api.core.SessionId
 import io.element.android.libraries.matrix.api.timeline.TimelineProvider
 import io.element.android.libraries.roomselect.api.RoomSelectEntryPoint
 import io.element.android.libraries.roomselect.api.RoomSelectMode
@@ -40,6 +41,7 @@ class ForwardMessagesNode(
     @Assisted plugins: List<Plugin>,
     presenterFactory: ForwardMessagesPresenter.Factory,
     private val roomSelectEntryPoint: RoomSelectEntryPoint,
+    private val sessionId: SessionId,
 ) : ParentNode<ForwardMessagesNode.NavTarget>(
     navModel = PermanentNavModel(
         navTargets = setOf(NavTarget),
@@ -62,7 +64,8 @@ class ForwardMessagesNode(
 
     override fun resolve(navTarget: NavTarget, buildContext: BuildContext): Node {
         val callback = object : RoomSelectEntryPoint.Callback {
-            override fun onRoomSelected(roomIds: List<RoomId>) {
+            override fun onRoomSelected(sessionId: SessionId, roomIds: List<RoomId>) {
+                // In Forward mode, the session cannot be changed
                 presenter.onRoomSelected(roomIds)
             }
 
@@ -75,6 +78,7 @@ class ForwardMessagesNode(
             parentNode = this,
             buildContext = buildContext,
             params = RoomSelectEntryPoint.Params(
+                sessionId = sessionId,
                 mode = RoomSelectMode.Forward,
                 maxNumberOfRooms = RoomSelectEntryPoint.DEFAULT_MAX_NUMBER_OF_ROOMS,
             ),

features/forward/impl/src/test/kotlin/io/element/android/features/forward/impl/DefaultForwardEntryPointTest.kt

@@ -15,6 +15,7 @@ import com.google.common.truth.Truth.assertThat
 import io.element.android.features.forward.api.ForwardEntryPoint
 import io.element.android.libraries.matrix.api.core.RoomId
 import io.element.android.libraries.matrix.test.AN_EVENT_ID
+import io.element.android.libraries.matrix.test.A_SESSION_ID
 import io.element.android.libraries.matrix.test.timeline.FakeTimelineProvider
 import io.element.android.libraries.roomselect.test.FakeRoomSelectEntryPoint
 import io.element.android.tests.testutils.lambda.lambdaError
@@ -39,6 +40,7 @@ class DefaultForwardEntryPointTest {
                 plugins = plugins,
                 presenterFactory = { _, _ -> createForwardMessagesPresenter() },
                 roomSelectEntryPoint = FakeRoomSelectEntryPoint(),
+                sessionId = A_SESSION_ID,
             )
         }
         val callback = object : ForwardEntryPoint.Callback {