Fix hasCompletedInitialSync never being set for existing users

- Set hasCompletedInitialSync = true when user has existing data
- Only scheduleDelayedCloudCheck for fresh installs with no data
- Fixes UI stuck on 'Syncing...' for returning users

Sources/Bedrock/Storage/CloudSyncManager.swift

@@ -193,6 +193,9 @@ public final class CloudSyncManager<T: PersistableData> {
         // On fresh install, wait for iCloud data
         if data.syncPriority == 0 && iCloudAvailable && iCloudEnabled {
             scheduleDelayedCloudCheck()
+        } else {
+            // Existing user with data - initial sync is complete
+            hasCompletedInitialSync = true
         }
     }