Surface unreadable vector stores as a repairable failure

app/MindWork AI Studio/Tools/Services/DataSourceEmbeddingStatus.cs

@@ -7,6 +7,10 @@ namespace AIStudio.Tools.Services;
 /// CurrentFileBlock and CurrentFilePage are null rather than zero while nothing is known about
 /// them: a file which is only about to start has no first block, and not every kind of document
 /// has pages to count. Block numbers start at one, the way the page states them.
+///
+/// VectorStoreUnreadable says why a data source failed, not only that it did. The UI needs that
+/// difference to offer the repair for this one case, and it is carried as its own flag so nothing
+/// has to read it back out of the message in LastError.
 /// </remarks>
 public sealed record DataSourceEmbeddingStatus(
     string DataSourceId,
@@ -21,7 +25,8 @@ public sealed record DataSourceEmbeddingStatus(
     IReadOnlyList<DataSourceEmbeddingFailure> Failures,
     int PermanentlySkippedFiles = 0,
     int? CurrentFileBlock = null,
-    int? CurrentFilePage = null)
+    int? CurrentFilePage = null,
+    bool VectorStoreUnreadable = false)
 {
     private static string TB(string fallbackEN) => I18N.I.T(fallbackEN, typeof(DataSourceEmbeddingStatus).Namespace, nameof(DataSourceEmbeddingStatus));