feat: add CategoryId/Condition/Format/Postcode to SavedListing for draft posting

EbayListingTool/Models/SavedListing.cs

@@ -11,6 +11,18 @@ public class SavedListing
     public string   ConditionNotes { get; set; } = "";
     public string   ExportFolder   { get; set; } = "";
 
+    /// <summary>eBay category ID — stored at save time so we can post without re-looking it up.</summary>
+    public string CategoryId { get; set; } = "";
+
+    /// <summary>Item condition — defaults to Used for existing records without this field.</summary>
+    public ItemCondition Condition { get; set; } = ItemCondition.Used;
+
+    /// <summary>Listing format — defaults to FixedPrice for existing records.</summary>
+    public ListingFormat Format { get; set; } = ListingFormat.FixedPrice;
+
+    /// <summary>Seller postcode — populated from appsettings default at save time.</summary>
+    public string Postcode { get; set; } = "";
+
     /// <summary>Absolute paths to photos inside ExportFolder.</summary>
     public List<string> PhotoPaths { get; set; } = new();
 
@@ -19,4 +31,21 @@ public class SavedListing
     public string PriceDisplay => Price > 0 ? $"£{Price:F2}" : "—";
 
     public string SavedAtDisplay => SavedAt.ToLocalTime().ToString("d MMM yyyy, HH:mm");
+
+    /// <summary>
+    /// Converts this saved draft back into a ListingDraft suitable for PostListingAsync.
+    /// </summary>
+    public ListingDraft ToListingDraft() => new ListingDraft
+    {
+        Title        = Title,
+        Description  = Description,
+        Price        = Price,
+        CategoryId   = CategoryId,
+        CategoryName = Category,
+        Condition    = Condition,
+        Format       = Format,
+        Postcode     = Postcode,
+        PhotoPaths   = new List<string>(PhotoPaths),
+        Quantity     = 1
+    };
 }