greeter: try to fix random nixos issue

quickshell/Modules/Greetd/GreetdMemory.qml

@@ -14,6 +14,7 @@ Singleton {
 
     property string lastSessionId: ""
     property string lastSuccessfulUser: ""
+    property bool memoryReady: false
     property bool isLightMode: false
     property bool nightModeEnabled: false
 
@@ -75,11 +76,18 @@ Singleton {
     FileView {
         id: memoryFileView
         path: root.memoryFile
-        blockLoading: true
+        blockLoading: false
         blockWrites: false
         atomicWrites: true
         watchChanges: false
         printErrors: false
+        onLoaded: {
+            parseMemory(memoryFileView.text());
+            root.memoryReady = true;
+        }
+        onLoadFailed: {
+            root.memoryReady = true;
+        }
     }
 
     FileView {

quickshell/Modules/Greetd/GreeterContent.qml

@@ -132,7 +132,7 @@ Item {
         function onLastSuccessfulUserChanged() {
             applyLastSuccessfulUser();
         }
-        function onLastSessionIdChanged() {
+        function onMemoryReadyChanged() {
             finalizeSessionSelection();
         }
     }
@@ -1030,6 +1030,8 @@ Item {
     function finalizeSessionSelection() {
         if (GreeterState.sessionList.length === 0)
             return;
+        if (!GreetdMemory.memoryReady)
+            return;
 
         const savedSession = GreetdMemory.lastSessionId;
         if (savedSession) {