Update preferences store to handle dates in telemetryRequested item

src/lib/stores/preferences.ts

@@ -25,7 +25,15 @@ function createPreferencesStore() {
     let stored: Preferences;
     try {
         const json = localStorage.getItem(STORAGE_KEY);
-        stored = json ? JSON.parse(json) : DEFAULT_PREFERENCES;
+        if (json) {
+            stored = JSON.parse(json);
+            // Convert telemetryRequested back to Date if it exists
+            stored.telemetryRequested = stored.telemetryRequested
+                ? new Date(stored.telemetryRequested)
+                : null;
+        } else {
+            stored = DEFAULT_PREFERENCES;
+        }
     } catch {
         stored = DEFAULT_PREFERENCES;
     }