feat(cv): expand builder studio tools

JobTrackerApi/Models/CvVariantSettings.cs

@@ -66,6 +66,10 @@ public sealed class CvSectionSetting
     // Optional CV-specific content for bullet/tag sections. Null uses master data; an empty list is
     // an intentional empty override. Entry sections continue to use stable per-item overrides.
     public List<string>? Items { get; set; }
+    // Optional presentation hint consumed by the shared renderer, so preview and PDF always agree.
+    // Unsupported combinations safely fall back to the normal row layout.
+    public string? Presentation { get; set; } // rows | grid | compact | bubble
+    public int? Columns { get; set; }         // 1 | 2
 }
 
 public sealed class CvItemOverride
@@ -167,6 +171,11 @@ public static class CvVariantSettingsJson
                 Items = group.Items.Where(item => !string.IsNullOrWhiteSpace(item)).Select(item => item.Trim()).Distinct(StringComparer.OrdinalIgnoreCase).Take(100).ToList(),
             })
             .ToList();
+        foreach (var section in s.Sections)
+        {
+            section.Presentation = NormalizeChoice(section.Presentation, "rows", "grid", "compact", "bubble");
+            section.Columns = section.Columns is 1 or 2 ? section.Columns : null;
+        }
         foreach (var section in s.CustomSections)
         {
             section.ContentType = NormalizeChoice(section.ContentType, "paragraphs", "bullets", "entries") ?? "bullets";