feat(jobs): complete workspace draft parity

JobTrackerApi/Services/JobApplicationHelpers.cs

@@ -281,6 +281,21 @@ namespace JobTrackerApi.Services
             return null;
         }
 
+        public static string? UpsertSavedApplicationAnswerDraft(string? notes, string? draft)
+        {
+            var humanNotes = RemoveSavedApplicationAnswerDraft(notes);
+            var answer = (draft ?? string.Empty).Trim();
+            if (string.IsNullOrWhiteSpace(answer))
+            {
+                return string.IsNullOrWhiteSpace(humanNotes) ? null : humanNotes;
+            }
+
+            var answerBlock = $"{ApplicationAnswerDraftStart}\n{answer}\n{ApplicationAnswerDraftEnd}";
+            return string.IsNullOrWhiteSpace(humanNotes)
+                ? answerBlock
+                : $"{humanNotes}\n\n{answerBlock}";
+        }
+
         public static string BuildFollowUpSubject(JobApplication job, Correspondence? lastMessage)
         {
             var subject = (lastMessage?.Subject ?? string.Empty).Trim();
@@ -467,13 +482,14 @@ namespace JobTrackerApi.Services
             var value = notes ?? string.Empty;
             if (string.IsNullOrWhiteSpace(value)) return string.Empty;
 
-            var startIndex = value.IndexOf(ApplicationAnswerDraftStart, StringComparison.Ordinal);
-            var endIndex = value.IndexOf(ApplicationAnswerDraftEnd, StringComparison.Ordinal);
-            if (startIndex >= 0 && endIndex > startIndex)
+            while (true)
             {
+                var startIndex = value.IndexOf(ApplicationAnswerDraftStart, StringComparison.Ordinal);
+                var endIndex = value.IndexOf(ApplicationAnswerDraftEnd, StringComparison.Ordinal);
+                if (startIndex < 0 || endIndex <= startIndex) break;
                 var before = value[..startIndex].Trim();
                 var after = value[(endIndex + ApplicationAnswerDraftEnd.Length)..].Trim();
-                return string.Join("\n\n", new[] { before, after }.Where(part => !string.IsNullOrWhiteSpace(part))).Trim();
+                value = string.Join("\n\n", new[] { before, after }.Where(part => !string.IsNullOrWhiteSpace(part))).Trim();
             }
 
             const string legacyPrefix = "Application answer draft:";