feat(jobs): complete workspace draft parity

JobTrackerApi/Controllers/JobApplicationDtos.cs

@@ -218,7 +218,11 @@ namespace JobTrackerApi.Controllers
         TailoredCvRenderOptions? RenderOptions,
         string? Status);
     public sealed record GenerateApplicationPackageDto(string TailoredCvText, string? CoverLetterDraft, string? ApplicationAnswerDraft, string? RecruiterMessageDraft, List<string> KeyPoints, List<string> AttachmentSignals, List<string> AttachmentFilesUsed, List<string> CoverLetterVariants, List<string> RecruiterMessageVariants);
-    public sealed record SaveApplicationDraftsRequest(string? CoverLetterText, string? Notes, string? RecruiterMessageDraft);
+    public sealed record SaveApplicationDraftsRequest(
+        string? CoverLetterText,
+        string? Notes,
+        string? RecruiterMessageDraft,
+        string? ApplicationAnswerDraft = null);
     public sealed record SavedPackageMaterial(string? TailoredCvText, string? CoverLetterText, string? RecruiterMessageDraft, string? Notes);
     public sealed record InterviewPrepDto(string Summary, List<string> TalkingPoints, List<string> LikelyQuestions, List<string> WeakSpots);
     public sealed record ReadinessDto(int Score, string Level, List<string> Completed, List<string> Missing, List<string> Reminders, WorkflowSignalDto WorkflowSignal);

JobTrackerApi/Controllers/JobApplicationsController.cs

@@ -837,7 +837,11 @@ Canonical profile:
             job.FeedbackRequestedAt = request.FeedbackRequestedAt;
             // HasResume/HasCoverLetter/HasPortfolio/HasOtherAttachment are derived from
             // Attachment rows, not settable here -- see AttachmentsController.RecomputeAttachmentFlagsAsync.
-            job.Notes = request.Notes;
+            // Application answers use the legacy Notes column for storage compatibility, but the
+            // general editor owns only human notes. Preserve the separate answer when those notes
+            // are edited; the application-package endpoint is the only place that clears it.
+            var savedApplicationAnswer = ExtractSavedApplicationAnswerDraft(job.Notes);
+            job.Notes = UpsertSavedApplicationAnswerDraft(request.Notes, savedApplicationAnswer);
             job.Description = request.Description;
             job.TranslatedDescription = request.TranslatedDescription;
             job.DescriptionLanguage = request.DescriptionLanguage;
@@ -1826,19 +1830,26 @@ Candidate CV/profile:
             var job = await _db.JobApplications.FirstOrDefaultAsync(j => j.Id == id, cancellationToken);
             if (job is null) return NotFound();
 
-            if (!string.IsNullOrWhiteSpace(request.CoverLetterText))
+            if (request.CoverLetterText is not null)
             {
-                job.CoverLetterText = request.CoverLetterText.Trim();
+                job.CoverLetterText = string.IsNullOrWhiteSpace(request.CoverLetterText) ? null : request.CoverLetterText.Trim();
             }
 
-            if (!string.IsNullOrWhiteSpace(request.Notes))
+            if (request.Notes is not null)
             {
-                job.Notes = request.Notes.Trim();
+                job.Notes = string.IsNullOrWhiteSpace(request.Notes) ? null : request.Notes.Trim();
             }
 
-            if (!string.IsNullOrWhiteSpace(request.RecruiterMessageDraft))
+            if (request.ApplicationAnswerDraft is not null)
             {
-                job.RecruiterMessageDraft = request.RecruiterMessageDraft.Trim();
+                job.Notes = UpsertSavedApplicationAnswerDraft(job.Notes, request.ApplicationAnswerDraft);
+            }
+
+            if (request.RecruiterMessageDraft is not null)
+            {
+                job.RecruiterMessageDraft = string.IsNullOrWhiteSpace(request.RecruiterMessageDraft)
+                    ? null
+                    : request.RecruiterMessageDraft.Trim();
             }
 
             await _db.SaveChangesAsync(cancellationToken);