fix(cv): preserve attachment flags across generic letter writers

JobTrackerApi/Services/ApplicationAssetsService.cs

@@ -266,6 +266,8 @@ public sealed class ApplicationAssetsService : IApplicationAssetsService
         }
 
         await StageCoverLetterAsync(_db, job, next.Length == 0 ? null : next, source, aiAction, ct, documentSettings);
+        // Retain dedicated-save draft readiness; generic/import/draft writers leave attachment flags alone.
+        if (next.Length > 0) job.HasCoverLetter = true;
 
         try { await _db.SaveChangesAsync(ct); }
         catch { _db.ChangeTracker.Clear(); throw; }
@@ -358,7 +360,6 @@ public sealed class ApplicationAssetsService : IApplicationAssetsService
             string.IsNullOrWhiteSpace(aiAction) ? null : aiAction.Trim(), nextSettings);
         job.CoverLetterText = text;
         if (settings is not null) job.CoverLetterDocumentSettingsJson = nextSettings;
-        if (!string.IsNullOrWhiteSpace(text)) job.HasCoverLetter = true;
     }
 
     private Task<JobApplication?> LoadJobAsync(string ownerUserId, int jobApplicationId, CancellationToken ct) =>