Ask for session verification before sharing with an unverified account

The incoming share is now displayed on top of the root, so the FTUE, and the session verification in particular, could be bypassed.

- When the current account is not verified, wait for the FTUE to be complete before displaying the incoming share, as before.
- When the user selects another account which is not verified in the room select screen, display the session verification flow of
  the FTUE for this account on top of the share. As in the FTUE, the user has to verify the session or to sign out.
- Expose the FTUE session verification flow with a new SessionVerificationEntryPoint, displayed by OtherSessionVerificationNode
  which sets up the session graph of the account to verify.
- Introduce RoomSelectNavigator so that RoomSelectPresenter can request the verification of the selected session.

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

features/share/impl/src/main/kotlin/io/element/android/features/share/impl/ShareNode.kt

@@ -69,6 +69,10 @@ class ShareNode(
             override fun onCancel() {
                 callback.onCancel()
             }
+
+            override fun onSessionVerificationRequired(sessionId: SessionId) {
+                callback.onSessionVerificationRequired(sessionId)
+            }
         }
 
         return roomSelectEntryPoint.createNode(

features/share/impl/src/test/kotlin/io/element/android/features/share/impl/DefaultShareEntryPointTest.kt

@@ -46,6 +46,7 @@ class DefaultShareEntryPointTest {
         val callback = object : ShareEntryPoint.Callback {
             override fun onDone(sessionId: SessionId, roomIds: List<RoomId>) = lambdaError()
             override fun onCancel() = lambdaError()
+            override fun onSessionVerificationRequired(sessionId: SessionId) = lambdaError()
         }
         val params = ShareEntryPoint.Params(
             sessionId = A_SESSION_ID,