Improve detection of completion for Link new device flow

The SDK emits a Done progress once complete, but our listener might have been deallocated before receiving the done.

features/linknewdevice/impl/src/main/kotlin/io/element/android/features/linknewdevice/impl/LinkNewDeviceFlowNode.kt

@@ -145,10 +145,7 @@ class LinkNewDeviceFlowNode(
                     LinkMobileStep.Starting -> {
                         // This step is not received at the moment, so do nothing
                     }
-                    LinkMobileStep.SyncingSecrets -> {
-                        // LinkMobileStep.Done is not received at the moment, so consider that the flow is done here
-                        callback.onDone()
-                    }
+                    LinkMobileStep.SyncingSecrets -> Unit
                     is LinkMobileStep.WaitingForAuth -> {
                         navigateToBrowser(linkMobileStep.verificationUri)
                     }

libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/linknewdevice/RustLinkDesktopHandler.kt

@@ -54,6 +54,8 @@ class RustLinkDesktopHandler(
                     }
                 }
             )
+            // We emit Done in case the progress listener was deallocated before scan() sent the Done
+            _linkDesktopStep.emit(LinkDesktopStep.Done)
         } catch (e: QrCodeDecodeException) {
             Timber.tag(tag.value).w(e, "Invalid QR code scanned")
             _linkDesktopStep.emit(

libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/linknewdevice/RustLinkMobileHandler.kt

@@ -49,6 +49,8 @@ class RustLinkMobileHandler(
                     }
                 }
             )
+            // We emit Done in case the progress listener was deallocated before generate() sent the Done
+            _linkMobileStep.emit(LinkMobileStep.Done)
         } catch (e: HumanQrGrantLoginException) {
             Timber.tag(tag.value).w(e, "Error during QR login grant")
             _linkMobileStep.emit(LinkMobileStep.Error(e.map()))